fender twin reverb owner manual

fender twin reverb owner manual

Unfortunately, original hard copy manuals from this archive are no longer available. Note: If you have a copy of an old Fender Guitar Amplifier owner's manual not shown in this archive, we'd love to have a copy to post here. A PDF would be great, or even a scanned JPEG, GIF or TIFF that we can convert.Submit a request. If the sound quality of the amp has degraded noticeably and HUM BALANCE and BIAS adjustments fail to restore sound quality, the tubes are worn and need replacement. Molti vocalist e musicisti hanno trovato il versatile Twin Reverb perfetto per la chitarra, il basso, le tastiere, la fisarmonica e il violino elettrico. Der neue '65 Twin Reverb ist eine getreue Nachbildung eines Original 1965 Twin Reverb BRIGHT NORMAL VOLUME TREBLE. The Twin Reverb has been used on thousands of recordings and countless live performances since 1954 when the first version (The Twin Amp) appeared on the music scene. Input 1 provides 6 dB more gain than input 2. The REVERB and VIBRATO features do not affect the NORMAL CHANNEL. BRIGHTNESS SWITCH-This switch provides an extra boost to the high frequency response of the NORMAL CHANNEL. MIDDLE CONTROL-Adjusts the amount of mid-range frequency boost or cut in the VIBRATO CHANNEL. BASS CONTROL-Adjusts the amount of low frequency boost or cut in the VIBRATO CHANNEL. Note: If all tone controls are full counter-clockwise, there will be no sound. If you have any questions, consult your authorized Fender Service Center. B. BIAS ADJUSTMENT-This is a factory adjustment only. Should the bias need adjusting, it should be performed by your authorized Fender Service Center. A very light soapy solution on a sponge may be used to remove dirt and residue that may accumulate in the grain. Be careful not to let any liquid come in contact with operating surfaces. We provide a safe community for finding the gear you want. Items must be returned in original, as-shipped condition with all original packaging.Please check the fields highlighted in red.http://bkkgroup.by/var/upload/exfo_ftb_200_otdr_user_manual.xml

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Currency. Please do not offer the downloaded file for sell only use it for personal usage. Looking for other manual? For this no need registration. May be help you to repair. You could suffer a fatal electrical shock. Instead, contact your nearest service center. Note! To open downloaded files you need acrobat reader or similar pdf reader program. In addition, Also some files are djvu so you need djvu viewer to open them. These free programs can be found on this page: needed progs If you use opera you have to disable opera turbo function to download file. If you cannot download this file, try it with CHROME or FIREFOX browser. Translate this page: Relevant AUDIO forum topics: Fender Princeton 112 Plus erosito labpedal bekotes; MEGOLDVA Sziaztok. A cimbeli erositohoz kellene egy labpedalt osszehoznom. A hozzaertoktol kerdem, csak sima kapcsolo van-e az eredetiben, vagy van benne soros dioda is?Ki-be szereles utan.Miert?-Megoldva. Sziasztok. A basszus gitarjabol kiszerelte. Majd sokkal kesobb vissza szerelte. Szerinte bezajosodott.A tisztelet teljes kerdesem az a tanult kollegakhoz, hogy miert. Hogy lehet ezt megmerni. Kell-e valamilyen alkatreszt cserelnem, es ha igen, mit. Doksit, a fotok alapjan, hol talalok hozza. Elore is nagyon szepen koszonom a segitsegeteket. Udv varga janoMa vissza kerult a Fender Bass-gitar eloerosito a gitarba. Kivaloan mukodik. Ez uton koszonom azoknak akik segitettek megjavitani. Ehhez a muveleti erosito es az ElKO-k cserejere es a 6,3 Jack aljzat bekotesenek a megvaltoztatasara volt szukseg. Lasd zsugori doksija. Meg egyszer koszonom. Udv JanoNagyon zajosan kerult hozzam az erosito. A bemeneten levo TL072-t kicsereltem alkatresz hijan hirtelen a benne levo masikra, ami a vegfok elott van. Jelentosen csokkent a zaja, de nem vagyok elragadtatva. Mi az, amit itthon be lehet szerezni, es zajban jobb ennel?You can write in English language into the forum (not only in Hungarian).http://www.axi-hohenstein.de/userfiles/exfo-omnicure-s1000-manual.xml

No date but Fender history suggests that this manual is from the mid '70s. Eight pages, does not include a Warranty card, schematic or complete pictures of the amplifiers. Front and rear panel layouts and functions are presented. RT aS EeUAD REVERB years of quality music in a wide range of controlled sounds. TWIN REVERB This manual is designed to familiarize you with the equip-FRONT P ANEL VIBRATO CHANNEL a DISTORTION. TT te. Cm Y —TM mm NT re. Da nm 0Jack No. 2 for use with second instrument or equip-Adds brilliance to ail noles, especially higher Ire-Volume setting from zero to full power output. Es oda, Via. Treble Control—Regulates amount of high fre-Middle Control—Adds a rich tone and accentsBass Control —Regulates amount ol bass re-Jack No. 2 for use with second instrument or equip-Adds brilliance to ali noles, especially higher fre-Ta Aa a cei bran. Volume setting from zero to full power oulput. Treble Control — Regulates amount of high fre-Middle Control Adds a rich tone and accents. Bass Control — Regulates amount of bass re-Reverb Control —Selecis the amount of rever-Speed —Regulates the rapidity of the vibrato ef-Intensity Control — increases or decreases theTo get the cieanest possible sound, push the Master. Volume Control knob in and turn it to “10.” AdjustHo UNION CONTROL. To get a distortion effect, turn the VIBRATO channel! -The amount of distortion. Is variable: Increasing the VIBRATO channel volumeSound “cleaner.” Make sure that the guitar is pluggedContro! out and adjust it to the desired sound level.Jeweled Pliot Light—indicates when amplifier isWatts) This socket is provided as aTry each position to find minimumCAUTION: Disconnect amplifier. A.C. plug from outlet beforeHemove fuse by pressing in andReplace only with Littiefuse No.

No danger ofBest balance is obtained by setlingOrdinarily, no adjustment should beIf, after checking all of the above, the system is still not performingFender Original Equipment tubes are designed and built to pro-To maintain best performance and quiet operation, replacement. Fender Musical Instruments furnishes warranly service through. TT TTT emBlends and sustains tone to any preset level.They prevent surface damage to theLined with soft flannel. Designed to adapt to most amplifiers, this stand - FUZZ WAL VOLUME PERALAn excellent stand for and Volume. Separate foot switches for theFingertip pre-setting of balanceG U IT A R S “Fender guitars are engineered to perfectly march theAtAvailable in a variely of fin.Original Fender Lead and Individual controls for each tions for perfect string adjust-. Rhythm pickups for that great ment. -. Fender sound.Exclusive bullet truss rod andExclusive Fender contouredContoured body. Deluxe precision machine. Individual controls for each. Something went wrong.Get the item you ordered or your money back.User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Report this Document Download Now Save Save Fender Twin Reverb 2 Schematic For Later 0% (1) 0% found this document useful (1 vote) 344 views 3 pages Fender Twin Reverb 2 Schematic Uploaded by Mike Description: Fender Twin Reverb 2 Schematic a Full description Save Save Fender Twin Reverb 2 Schematic For Later 0% 0% found this document useful, Mark this document as useful 100% 100% found this document not useful, Mark this document as not useful Embed Share Print Download Now Jump to Page You are on page 1 of 3 Search inside document Browse Books Site Directory Site Language: English Change Language English Change Language.

The selection of a Fender amplifier will reward you with years of quality music in a wide range of controlled sounds. This manual is designed to familiarize you with the equipment and to acquaint you with its many fine features. See Output Tube Bias Adjustment Instructions below. K. BIAS TEST POINTS - Used to measure output tube bias and balance with a digital voltmeter. See output Tube Bias Adjustment Instructions below. DO NOT have the amplifier plugged into a power outlet when cleaning. TROUBLESHOOTER'S CHECKLIST - Is the power cord properly plugged into an electrical outlet? - Is there power at the still not operating properly, consult your authorized Fender Service Dealer. Please help improve it or discuss these issues on the talk page. ( Learn how and when to remove these template messages ) Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Please improve it by verifying the claims made and adding inline citations. Statements consisting only of original research should be removed. ( January 2011 ) ( Learn how and when to remove this template message ) No cleanup reason has been specified. Please help improve this article if you can. ( January 2011 ) ( Learn how and when to remove this template message ) The Twin was introduced in 1952, two years before Fender began selling Stratocaster electric guitars. The amps are known for their characteristically clean tone.You can help by adding to it. ( October 2013 ) The 1?12 Deluxe-Amp, the 1?15 Pro-Amp and the 3?10 Bandmaster are exceptional in dynamics and tone.Due to its volatile nature if broken, it was quickly superseded with a GZ34 rectifier but not duly noted on the tube chart until the second production.The 5F series Twin utilized the finest heavy duty Concert Series Jensen P12-N Alnico V blue-dome loudspeakers (conservatively rated in 1957 at only 18 watts apiece).

In the day, players would rarely ever open such high-fidelity amplifiers to their distortional limits. With such bursts of volume energy, often these top-of-the-line Jensen speakers would fail, and sometimes even burn out (smoke) voice coils. Many well used Twins have replaced speakers today. Keith Richards has used these late model, high-power Twin amps on Rolling Stones tours with his own special design Celestion Alnico (similar to the G12-80) speakers to insure optimum live efficiency.Nonetheless, Fender Musical Instrument Co.The image of the Twin-Amp in the 1960 Fender Catalog has been the subject of considerable scrutiny.This variation lends support to the idea that the 80-watt circuit was beyond the power handling capacity of the speakers of the late 1950s. After a slight change in appearance, from the rough blonde tolex and maroon grille appearance to a smooth blonde tolex with a gold grille cloth, the Twin-Amp was replaced with the Twin Reverb-Amp in 1963.The Twin now had an onboard spring reverb tank and was renamed the Twin Reverb. The Fender Twin Reverb is considered a standard model for players seeking a clean sound, and it is especially known for the quality of its built-in spring reverb.The brown one still had the harmonic tremolo and early Vibroverb reverb circuitry with an extra tube and rear dwell control. The blonde Twin Reverb Leo gave to steel player Red Rhodes for testing purposes at the famous Palomino Club (North Hollywood). Performing in the house band with band leader Gene Davis, Red played his Pedal 1000 steel and Twin Reverb live, and on some popular TV shows including Cal's Corral (I'll eat a bug. Cal Worthington), Star Route, and Country Music Time.The first production Twin Reverb models used an unusual 7355 power tube (weaker cousin to the 6L6) as with their concurrent smooth blonde, blackface Fender Showman amplifier.The circuit used is commonly known as the AB763 circuit.The controls have black-skirted knobs numbered from 1 to 10.

The Vibrato channel has a duplication of the same controls as the normal channel, plus the addition of reverb, vibrato speed and intensity controls. The vibrato bug is a four-wire device consisting of a neon tube and light-dependent variable resistor, packaged in a short section of black tubing. It resembles a water bug, with slender wispy legs. The tube generated vibrato oscillator pulsates the neon light, which varies the resistance on the resistive element. That variable resistance is applied to the audio signal on the Vibrato channel, creating a pulsating increase and decrease of that channel's volume. The speed controls varies the rate of the oscillator. The depth control limits the amount of application the variable resistor has on the audio signal. Units made before the takeover of Fender by CBS in 1965 will be marked Fender Electric Instruments, and be worth a bit more on the collectors market.Some Twins were fitted with EVM 12L variant speakers known as EVM 12Fs. Unlike most Electrovoice speakers, they were fitted with metal dustcovers like the JBL D-120Fs.Other blackface cosmetic features were retained. The first silverface Twins used the blackface AB763 circuit until May 1968, when Fender switched to the AC568.During the silverface period, the Twin Reverb's chassis and AA769 circuit was shared by the Dual Showman Reverb, effectively producing the Twin Reverb in a head form, although the matching speaker cabinet for the Dual Showman Reverb sported a pair of 15-inch JBL speakers rather than 12-inch. A Hum Balance was added at this timeThe Twin Reverb II was produced until 1986, and was available as a head (amplifier alone) or 2?12 combo. The circuits for this series of 1982 Fender amplifiers were designed by amp guru Paul Rivera; the 60w Concert amplifier was by far the most successful in terms of sales, but all models in this range and the next are now becoming highly sought-after by collectors and players.

This was the first in the series to use PCB (printed circuit boards) instead of PTP (point to point) wiring. All subsequent models and reissues have used PCBs.On the front panel it says Twin Amp. It has two inputs, no vibrato, two channels with gain select on the floor pedal to give it two sounds per channel and an effects loop. It is 100 watts and also has a switch for a Low Power (25 Watt) mode.The front panel contains (left to right): a single input, clean channel controls (volume, bright switch, treble, middle, bass), distorted channel controls (volume, treble, middle, bass, master volume, channel select), and shared controls (reverb, tremolo speed and intensity, presence). The rear panel contains power and stand by switches, output power switch (100W or 25W), effect send level, effect loop switch, return level, preamp out, power amp in, footswitch jack, tube bias adjustment and balancing, external speaker jack, main speaker jack. The tremolo is a tube bias tremolo. Curiously, it can be switched on through the footswitch only. The amplifier features two 12 inch Eminence special design loudspeakers in parallel (8ohms each, 4 ohms total load).Fender's original intention was to issue only 300 of this model, but it was continued due to its success in the market.Archived from the original on 2008-07-15. Retrieved 2008-07-16. CS1 maint: archived copy as title ( link ) Milwaukee WI: Hal Leonard Co. p. 406. ISBN 978-0634056130. Archived from the original (PDF) on 26 July 2015. Retrieved 22 June 2015. Retrieved 14 July 2013. By using this site, you agree to the Terms of Use and Privacy Policy. Learn more - opens in a new window or tab This amount is subject to change until you make payment. For additional information, see the Global Shipping Programme terms and conditions - opens in a new window or tab This amount is subject to change until you make payment. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable.

For additional information, see the Global Shipping Programme terms and conditions - opens in a new window or tab Estimated delivery dates - opens in a new window or tab include seller's dispatch time, and will depend on postal service selected. Delivery times may vary, especially during peak periods. Learn More - opens in a new window or tab Learn More - opens in a new window or tab Learn More - opens in a new window or tab Learn More - opens in a new window or tab Learn More - opens in a new window or tab See the seller's listing for full details. You're covered by the eBay Money Back Guarantee if you receive an item that is not as described in the listing. Find out more about your rights as a buyer - opens in a new window or tab and exceptions - opens in a new window or tab. Contact the seller - opens in a new window or tab and request a postage method to your location. Please enter a valid postcode. Please enter a number less than or equal to 1. All Rights Reserved. User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Zack Linton on Alex's Fender Red Knob Evil Twin. The amp has been modified to emulate. Real clean Fender head loaded with un-gigged Groove Tubesalso listing a 2x12 Fender cabmotivated seller Make an offer. It featured a dual output switch, allowing the user to select either 25 watts or 85 watts of output.Vintage 1968 Fender Amplifier Owner's Manual, Warranty Card. Click here to view the Quilter Steelaire Owner's manual. Fender Dual Showman Rack System - Revelation Preamp, Stewart Woorld Power A single simple red thumb screw secures the rack amp to the speaker cabinet. So there's no need for a knob guard or any worry about bumping the amp knobs while moving it. Hoffman eyelet boards, Fender style eyelets, Hand wired eyelet boards, Fender, Marshall, Vox. 76, Fender, Dual Showman Reverb, AA270. Fiberboard. We've updated the ebay and PayPal User Agreements and Privacy Notices.

Add in a master gain knob and you have the basics for a very useable workhorse preamp. To me, the Fender Twin is the quintessential clean amp tone, this thing is really close though. Check the schematic. Same chassis was used for the Dual Showman Reverb, Vibrosonic Reverb, then I probably buy that amp, recap it and do good general service.maybe. The Blues Jr. NOS takes Fender's 15W gem and gives it the true vintage treatment I'd blame it on someone that can't read a schematic, but it's definitely built this way on purpose. My other fav amps now are a 70's Dual Showman with a 4-12 cab and a The online sell person was very nice with service 3 she provided. They started by putting the description on the front fender, and from there the monikers became There was a small luggage rack on the tank and a steering head tensioner knob sticking out of the triple-tree. Service manual. I did bring home a nice Fender Dual Showman speaker cabinet that was custom made. Leo Fender began building guitar amps before he started manufacturing guitars. Posted by Superb vintage Fender Dual Showman Stack, a classic American all tube amp. User Name The control knobs look crowded in a small chassis. For your consideration is this Fender 1965 Twin Reverb.It's a series of acoustic guitars as a company seems to use Western Red Cedar 100% Satisfaction Guaranteed this Fender Standard Jazz Bass review below In this and wants advice from the instruction and Patrick Joseph Healy settled a complete do-it-yourself guide by gayle monroe (feb 26, 2012) kindle ebook. Second, it sounds phenomenal, with dual Seymour Duncan humbucking pickups, a push-pull coil tap switch built into the master tone control knob, and more. Showman, Showman Reverb, Pro Reverb, Super Reverb, Vibrolux Reverb, Deluxe Reverb 65' RI, Dual Professional, Prosonic Combo, The Twin(red knob) 94' Twin NOT use internet or owner's manual dimensions because they are often incorrect.

We acquired it from the original owner who purchased the guitar directly from Jim This is a showman's guitar, finished in smart modern style with lotus ivory top cover and 12 page hang-tag instruction manual with matching serial number.It certainly has for me. The 3-string Walkingbass is an easy instrument to learn, yet it The Spirit of Art in Technology. 1317 Ross Street Petaluma, CA 94954 USA The DB 750 is a groundbreaking hybrid amplifier with a discrete Mosfet output section and an all This is the Middle Atlantic power supply it is located near the bottom of the equipment rack. 2. Power on the Denon Recorder. 3. Watch We believe that every piece of music Yet it is generally the case that no firm within the industry sells a product This publication is protected by copyright and all rights are reserved. Voodoo Lab, Control Switcher, You can use our software to digitize music All Rights Reserved. Index These step by step how to manuals will give you the foundation necessary to use your new LED lights. The small and elegantly designed In order to achieve maximum performance and reliability you should study these I can also find items priced within your expected budget. I can also find items priced within your expected budget. Please review the items and let me know which ones you are interested in. You can also If Euro is not your domestic currency you can successfully use Universal Currency Converter How to read Rek price list? First of Connecting up using the high level input. Connecting up using the low level input. Used properly and carefully, it should give many years of outstanding musical reproduction. By Walter A. Breining, N9WB D-104 Discussion The D-104 has been around since the 30 s and is still popular today for communications. OR, you can scan the entire article Connecting up using the high level input. Connecting up using the low level input.

The lightning flash with arrowhead, within an equilateral triangle, ENGLISH (Original instructions) Model: Chocolate Box This publication is protected by copyright and all rights are reserved. Individual power supplies are provided for specific voltages (100V, 117V, 230V, 240V) with corresponding plugs appropriate When the video pops up as a track a small The versatility of the Amplifier makes it the perfect choice for almost every type of custom multi-room Please read this User s Manual before using the product. Change without Notice AWT07MLED 7 Q TFT LCD MONITOR (LED Backlighted) USER MANUAL e-4 SAFETY PRECAUTIONS Federal All rights reserved. This guide may not be duplicated in whole or in part without the express written consent of This guide will help you to quickly set up your new ButtKicker system with your PC or gaming console. This guide will help you to quickly set up your new ButtKicker system with your PC or gaming console. Contents: a. ButtKicker Gamer CHATBOARD Classic is Danish Design - made in Denmark. Classic is a glass Dull Introduction Models Covered 6V Solar Missing or altered serial numbers automatically void the warranty. For your own protection, be sure the serial number This guide will help you setup the iconnex Fits all 4-Speed Big Twin 1936-84. Tankless Electric (RTE) Troubleshooting Our subwoofers exemplify the best in modern audio technology, and are designed Home Automotive Commercial Unidirectional dynamic mics are When used with a high quality 2 ohm rated power And certainly, The letter and first digit To use this website, you must agree to our Privacy Policy, including cookie policy. This was stated by a happy Twin Reverb owner on Harmonycentral.com. It could have been our own words. Where the other Fender amps break up at around 4 on the volume knob, the Twin stays clean up to almost 6 and will hold up against heavy drummers and bass players with clean notes sharp as a knife edge.

This is exactly what the amp is made for, being played unmiked in in a gospel band in a 300-seat church every Sunday. It is designed not break up like the other Fender amps. You need to have your expectations set correctly to be able to appreciate the evil Twin. Warning nr 1) Weight. The big transformers and speakers makes this amp weigh around 40kgs, a burden too big for many gigging players who cannot (yet) afford a crew of roadies. Warning nr 2) Volume and clean headroom. If you want tube amp breakup and smoking tones with no pedals you will experience many fights with your band mates and club owners. Just as the other Fender amps the Twin needs to operate in its sweet spot up to sound sweet. After carrying a Twin Reverb on to the stage, the least you should deserve is to crank the bastard. Sadly, we are seldom offered the opportunity to turn the volume above 3 on a Twin Reverb. Instead we have played many nights with a thin and unpleasant tone, even worse with a sparkling, clean sounding strat. If you are one of these players, you should find some mods on this page interesting.Finally we point out location of components in the physical layout diagram. To see embedded text comments, go to video on Youtube. We have observed that the Jensens are considered as very good speakers both tonewise and in terms of robustness. The Oxford 12T6 are also superb speakers, a lot better than the 12L6 found in many Pro Reverbs and Deluxe Reverbs. They’ve got all what it takes, punch and sparkle. In a 50 year old vintage amp the condition of the speakers varies a lot. We’ve heard poor Jensens too. To those who are both players and collectors we would recommend to recone the speakers if you’re not happy with the tone. You may get a pair of vintage speakers to sound much better than they originally did in the 60s and 70s A64 Twin with Oxford 12T6. Installing high or low efficient speakers depends totally on your need for volume.

In stead you should go for less efficient, “vintage” type speakers, perhaps with a dark frequency response if you are planning to play the amp beyond its sweet spot. Darker speakers tend to smoothen out the preamp and power amp tube distortion. For clean tone you should seek more neutral and transparent speakers. A nice trick is to pair different speakers, one vintage type and one more powerful. At some occasions we must admit that we get excited and fire up our Twin and Pro Reverb with speakers like EVM12L, Warehouse Veteran 30 or Eminence Swamp Thang. The punch of a big tone is amazing when coming from a big cabinet. Beware of the weight, though. Again, installing high or low efficient speakers depends totally on your need for volume. The TR can be really loud and even interfer with the bass guitar. A simple trick is to disable one of the speakers for less volume and earlier breakup. Not only do you reduce the speaker areal and bass tones, the tubes are pushed harder since they see a 8 ohm load in stead of 4 ohm through the output transformer. You’ll achieve sweet spot at a lower volume.Ideally you should have the amp re-biased to not run the two remaining tubes too hard. The voltage levels on the plus- and minus-sides of the output transformer’s primary circuit remains the same whith two and four 6L6 tubes. But the delivered current is doubled with four tubes. Hence, the power is also doubled. This mod is a must-know survival trick for all Twin owners. These tubes have different frequency responses than 12AX7, particurlarly when distorting. People describe these tubes to have less harsh and buzzy distortion. This mod does not alter the tone significantly when amp is played clean or when only the power amp section distorts. You’ll have to increase the volume setting to achieve a similar volume as before.It is so easy to enable and disable that it can hardly be called a mod.

If you are like most players and only use the Vibrato channel (reverb, tremolo, the bright cap and the extra gain stage), you should pull out the V1 tube. This is the preamp tube for the normal channel which you are not using when playing the Vibrato channel. Vice versa; If you’re using the Normal channel, you can pull out the V2 tube. If you pull one tube the other channel’s tube will be hotter biased and offers more gain. The amp will play louder than before given the same volume knob setting. The stronger signal will push the second gain stage (V4 tube) harder and give you increased sustain, compression and harmomics. This mod does not change the amp’s clean headroom but increases the preamp gain and preamp distortion. This mod is one of Cesar Diaz’ tricks in the Fender Custom Shop Vibroverb 64 which he always did to Stevie’s amps. This mod is safe. It has stood the test of time and been been done by players in 50 years in blackface Fender amps. This mod reduces the amp’s clean headroom and you’ll achieve sweet spot at a lower volume. You’ll notice that the amp gets looser and with less attack. Tips: If you pulled the V1 12AX7 tube you may use it as V6 phase inverter. 12AX7 as phase inverer tube will give the most effect out of this mod. 12AU7 will be in between 12AT7 and 12AU7. We all know that speakers change their tonal character during age. So does the reverb. The reverb function sounds and behaves differently between “identical” vintage amps. Some amps have long, lush and soft reverb while others are mushy and overwhelming. We often find the reverb sweet spot around 2.5 on the reverb pot, varying from 2 to 4. Some amps are sensitive and difficult to control the reverb on. The whole dynamic area can be within a narrow interval, i.e. 2 and 2.5. These amps require a careful touch when dialling in the reverb, which irritates us. The reverb circuitry consists of two tube sections (reverb driver V3 and reverb recovery V4) and the physical reverb tank.https://abcdedektor.com/images/3m-x62-projector-manual.pdf