Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Esquirefreak on August 11, 2022, 01:14:38 pm
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Im currently building a '61 6G15 replica and next build will be a 6G4-A, but one always gotta have a new build in sight, right?
I own a 6G9-B ('63 Tremolux) and its one of the best Fender amps I've heard and played. And by now I've had a few of 'em.
I'm considering building a single channel version using a Bassman size chassis and making a combo cab.
Since I may or may not add reverb it, I thought I'd maybe make it a single (bright) channel 6G16 instead.
Hence my questions:
× Apart from the obvious reverb and a NFB resistor, are there any major differences between the two brownie amps? And yes, I know the PTs are way different with lower voltages in the Tremolux.
× If one included reverb, would there be any pros of following the schematic using a 12AX7 as a reverb driver rather than a 12AT7?
I gotta learn how to keep things short. Sorry about that.
Best regards from the south of Sweden
/Max
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Best thing do do it for you to print out both layouts and do a compare so you are familiar with both amps
https://el34world.com/charts/Schematics/files/Fender/Fender_Schematics.htm (https://el34world.com/charts/Schematics/files/Fender/Fender_Schematics.htm)
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Brown Vibroverb is almost* a BF reverb amp circuit except for the bias-vary trem wiggling the output tubes. Another way of saying it, is the brown vibroverb is like a BF tremolux, but with reverb.
* the 6G16 circuit works better with 12AT7s in the reverb driver and LTP sockets. The 6G16 bias-vary trem has the same hypnotic quality as the tremolux.
Allen Encore is an example of 'single channel BF amp' with reverb and bias-vary trem for 6L6s. Proven design
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Alright!
Yeah, that trem really is something special.
As for the tonestack, how would those tapped treble pots compare to the standard 250k pots of the AB763? I suspect it will affect both highs and higher mids?
/Max