Tube Amp Archive

P1eXtreme ran a 6V6 at around 370 Volts on the plates with a 600 Ohm cathode resistor. Might try raising the cathode resistor to 600 Ohms.

Trim pots? Go for it man. Once you've found your bias settings you can either leave them in, or replace them with suitable resistors. Once it is buttoned up who cares?

Kelly

Stereo amp (2 x 6BQ5) with center channel woofer / subwoofer (2 x 6BQ5)?

Here's the Gretsch 6159 (similar amp - both made by Valco). There are some minor differences in a few of the capacitors (I pretty much followed this for my 1688 build). The ones circled by Sluckey have the same value. https://el34world.com/charts/Schematics/files/Gretsch/Supro_gretch6159.gif This tr...

I built the 1688 version of the Supro 6688. It has a tremolo in the preamp that has no thump. https://el34world.com/charts/Schematics ... _s6688.pdf

Looks really cool! Nice work! Love the cabinet.

+1

I have used blind rabbet joints on numerous head cabs and several speaker cabs without issue. Fairly easy to make with a router table or table saw. I have found that Gorilla glue works pretty well for these as well as traditional Titebond. These are all tolex covered. These joints do not look as goo...

I have an original 2061 and it's my current favorite amp overall. What a beautiful expressive tone machine!

+1. I built a clone. It is my favorite push-pull amplifier. A real rocker.

I have the Grizzley version of the HF drill press. I found the platform clamp at the rear stripped pretty easily when tightened (cheap Chinese steel). So I use a C-Clamp to maintain platform height. Other than that issue it's been a workhorse.

The 2061 has become hands down my favorite amp. It gets the lion's share of my play time. +1. My favorite too! I built a clone 20 watter - 2061X - several years ago. I added a one-wire mod to the preamp. Doesn't really need it. Playing through a 4 x 10" cab w/Emi Ramrods. A straight up rocker as it...

Nyberg's website has some photos and audio demos of the High Octane and November AX8 projects: http://www.cs.cmu.edu/~ehn/ax84/#filter

Maybe the amplifier was originally set up for 6550s. Check out the bias circuit here:

https://mhuss.com/MyJCM/JCM800_2204.gif

Probably because every time I talk to friends or family they want something from me so I just avoid em anymore.

Ha! Ain't it true. I never talk with the family (wife's anyway) since the ONLY time they call me is when they want something. Leeches.

Spare triode? How about a tremolo oscillator?

Here's an idea: http://sluckeyamps.com/trem/trem.htm

Very cool video. I know what he means by o-scopes being limited.

This would make a good topic for a Masters thesis.