Tube Amp Archive

I did a whole bunch of fiddling around the amp and I finally got it to where I want it to be. Changed the Master Volume type and settled on one Feedback resistor (removed the toggle), bumped up the power amp grid stoppers to 10K. The amp plugged into a proper cabinet now sounds stellar, no buzzing w...

Does it make the noise plugged directly into an appropriate speaker cab? +1, @brewdude's suggestion. Your audio clip does not sound like ghost notes caused by poor filter capacitance, IMO. Another test: Disconnect the NFB (R26 to OT secondary) to see how that affects the buzzing noise. More tests: ...

Guys, I am in a need for help... I have been tracking down an issue in this amp and cannot trace it down... When I play bass notes past 5-6 on the preamp volume, I get a buzzing sound that seems somehow related to the note that I play. I believe the issue is present in the higher notes, but the buzz...

Here's the video with the "mods", recorded through Palmer.

Nice little amp... 8) Which Jensen speaker did you use: a C8R? Merci! :) Yes, I the C8R is in. Also, as the champ is perfect for that, today I did a bit of fiddling and tuning the amp. Now it's exactly the way I want it to be! :) Changes: Added V1 Cathode resistor (22u) - I omitted this one in my l...

From the inside...

And the soundclip of the amp cranked. Miked, with a splash of compression and EQ.

Hi folks, Seems I've been bitten by a Tube bug as it seems I cannot stop making more tube amps for fun :roll: After a 18W plexi, a 6V6 Bassman and a Tweed Champ it's time for an another Champ. The last one I made sounded amazing and I was kind of sorry to have sold it. I even got my hands on the 57 ...

First and most obvious target is C13 and C14, the 0.1uF post-PI coupling caps. Replace those with 0.02uF and see how it sounds. Next would be to replace the 820R shared cathode resistor R7 with individual 1K5 resistors, bypassing the bright side (C1) with 0.68uF, and the normal side with 25uF. Than...

You can certainly trim the bass with coupling caps and/or cathode bypass caps. Please point to the schematic you used so we can be specific. I was working roughly by this schematic: https://www.tube-town.net/cms/userfiles/media/tt-5f6/5f6-schem.pdf With some adjustments: PP tail 6.8K 6V6 grid stopp...

Thanks guys! The project is slowly coming to an end... E90E2CD1-E3B4-4A0D-B532-67E9C2958F6E.JPG However, I still need to do a bit of tweaking of the circuit. The sound is way too bassy, the clean sounds good but the overdrive sound is nothing spectacular. Also, when I hit the amp with the Fuzz Face ...

Hi Stevem, thanks for the answer! I put the caps exactly as they are in the 5f6 schematic and tried it with the gz34 and I am happy with the outcome as the amp is not too stiff. Still some cosmetics to do, but sonically I would say that the amp has passed the test. Here are my first impressions: The...

Question on the PSU, if someone knows your help will be appreciated! :) I wanted to put a 5y3 rectifier but the specs sheet has 20uF as input capacitance. I have 2x22úF as a standard 5F6 installed, can I still use 5Y3 or do I need to go for a GZ34? Also, making some progress... IMG_3604.JPG IMG_3603...

Bias circuit done: PI with no grid leak resistors, which will be the MV pot:
Just realized I have not ordered mixing resistors

The chassis had arrived so I did a quick fit test.
Protective foil removed, power transformer and sockets installed.
Rectifier wired up, heater filaments are next:

Looks very cool! The 5F6A is a great circuit. My recommendation is to separate the cathodes of the two input stages so that you can voice them differently. Then when you jumper the two channels you can adjust the two volume controls to mix to taste. There's magic in that method. :twisted: At least ...