This pot, like the bias potentiometer we’ll be using, is still commercially available (try Angela Instruments), but if you need to get things going quickly, any standard 100-ohm (or even 250-ohm) pot should function just fine. Next, attach the wire from the bias power supply board (the purple wire in Photo 3) to the counterclockwise leg of the control along with a 10k resistor, and solder these in place. Terms Of Use. In 1976 or ’77, Fender incorporated another major revision to the Twin Reverb design, changing the output stage to an “ultra-linear” design and increasing the output power. Rig Rundown Best-Ofs: Gargantuan Pedalboards Vol. The 135-watt version of the Fender Twin Reverb (Photo 1) was produced from approximately 1977 through 1982. These amps can be identified by their output power, listed on the rear panel near the speaker jacks as 135 watts. The one closest to chassis’ edge is for the reverb pan input. You’ve now completed the phase inverter updates. /* Add your own Mailchimp form style overrides in your site stylesheet or in this style block. The first three appeared in summer 1966 and included a 100-watt transistorized Twin Reverb with dual 12-inch speakers mounted one above the other. ), We really don’t need this function nowadays because matched output tube sets are readily available. Fender MTG Tube Tremolo: The Premier Guitar Review. Germany, However there is a TRRI with a 15 called the Twin Reverb Custom. Privacy Policy | On the clockwise leg, install another 10k resistor along with a 15k and solder. You are correct, Thierry. Also, the pot mounted in the output-tube-balance position has three lugs, but it appears that it should have four. Next, let’s get rid of the unnecessary components in the overdrive circuit that put a bit of a load on the signal. Currency: The Legendary '65 Twin Reverb. This required a differently designed output transformer. 2. Hooked: John Osborne on Jimi Hendrix's "Little Wing", 5. Remove both 47k resistors. The 135-watt version of the Fender Twin Reverb (Photo 1) was produced from approximately 1977 through 1982. */, Copyright ©2020. Anyway, let’s see if we can reinstall the missing pieces in your piece of late-70’s history. EUR I’m hoping you can help me. The Fender Twin and Twin Reverb are guitar amplifiers made by Fender Musical Instruments Corporation.The Twin was introduced in 1952, two years before Fender began selling Stratocaster electric guitars.The amps are known for their characteristically clean tone. Just when guitarists had figured out that pushing the output stage into distortion leads to glorious tone, the engineers at Fender once again decided to “improve” their product! Learn More, We understand the importance of online privacy and are committed to complying with the EU General Data Protection Regulation. We’re going to remove these resistors and replace them with 1M (brown, black, green) resistors (Fig. This removes the drive signal to the overdrive circuit should the function be accidentally engaged. We recommend moving this block and the preceding CSS link to the HEAD of your HTML file. Locate the two 47k resistors (yellow, violet, orange) connected to the plates of the same tube (Fig. UL OT, high voltages, bright cap on MV pot make this amp definitely too bright for me ! I'm not aware of a Twin Reverb Custom at 135 watts with a 15". Privacy Policy | Learn More. The mid-’60s also saw Fender’s first ill-fated foray into solid-state amps. With their stated power of 85 watts, they are the most powerful Fender amps of the era. 6). To reflect our commitment, we updated our terms and conditions. These are the loudest and cleanest of all Twin Reverbs. Locate the two resistors (Fig. Twist together the ends of the two 10k resistors, and then solder them, along with a wire long enough to reach the bias resistors in the phase-inverter section of the circuit board. These components are only necessary when the distortion function is engaged, but they exert a small load on the signal just prior to the master volume. Replace the resistor connected to pin 1 of the 12AT7 phase inverter with an 82k (gray, red, orange). That’s it for the hum balance, so on to the creative part. #mc_embed_signup{background:#fff; clear:left; font:14px Helvetica,Arial,sans-serif; width:100%;} This month’s column covers small circuit modifications you can make to improve the sound. I'm tempted to re-silverface it to see what it sounds like but it's a gorgeous, sparkly and unyielding clean thing as it is. Ask Amp Man: Beefing Up a Fender Deluxe Reverb Reissue, Ask Amp Man: Upgrading a Fender Custom Vibrolux Reverb, 5. Fitting that we just gave it some freedom! 1970's Fender Twinn Amp Head 135 Watts. Wonderful sound. During the ultra liner run late 70s early 80s. Connect the other end of the 15k resistor to ground by soldering it to the body of the pot, or a large ground lug if you have one. Let’s start with the hum-balance control. How Could Guitars with Names Like These Not Be Amazing? (It comes to you from the creative Fender engineers responsible for the design of the Bassman model AB-165.). #mc_embed_signup{background:#fff; clear:left; font:14px Helvetica,Arial,sans-serif; width:100%;} We believe that this is the most complete, highest resolutio EUR We’ll also be disabling the amp’s push/pull distortion feature, but hey, nobody I know uses it, so no love lost there. These are the loudest and cleanest of all Twin Reverbs. PDF format. 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