Tube Amp Archive

Sweep with both knobs in same position
1/4" XLR: Comparative: Sweep of High Pass filter:

Hey everyone! I built a few of these tube DI boxes awhile back and, while not tube amp per se, I think it's something that everyone should at least build once. This particular one comes in the form of a PCB project from Conspiracy to Commit Electronics: https://c2celectronics.com/product/nobelium-pc...

guitarpkr76 wrote: ↑Thu Jul 03, 2025 8:57 pm I'm curious why Drew would be selling them. As the new caretaker of the Dumble name I'd assume he'd be hanging on to as many amps as he could. I know he's a dealer so he could be selling them for other people.

Money. He sells them for money

I hate to say this as a DIY person but if you have a local recone shop that can do it, you might consider sending it to them. I say this because they are a dying business. I work for JBL and talk with many of the Authorized Service Centers and there is a common refrain: "My kids have no interest in ...

Looking good!

Feel free to post any errors here and i'll get around to correcting them and updating the layout.

Something I just noticed about the reverb circuit in this amp is the 120pf cap across the 220k reverb out to ground signal. I attached a pic here showing it. Capture.JPG Its not mentioned but I believe this preforms the same function as placing the .01uf cap across the Reverb Return pot as seen in ...

Can confirm the Manning Filter setup is an improvement, in the sense that the steps are more predictable and useful.

ive often thought it would be cool to build this as an effect with buffered in/out so you could add it to any amp with an effects loop. Post preamp EQ in general is really powerful.

I wonder if it sold? The listing on Reverb ended....

I really got into this guy awhile back. Very cool unconventional guitar work. Phil Collins like vibes:

https://www.youtube.com/watch?v=z0pzzkp ... rt_radio=1

https://www.youtube.com/watch?v=3bLYswn ... Kg&index=5

Looks great! Is that rosewood or cocobolo on the front fascia for the headcab?

Still running 6CA7. My only gripe is there is a very low, ambient hum when I turn it on. I think maybe OT orientation needs to change a little but nothing terrible. Someone mentioned an issue where the master volume didn't start doing something until you turned it up a bit and then it suddenly spran...

Now that you mention it, I did a little demo video of my completed #005 yesterday and posted it on youtube:

https://youtu.be/2MEt9pbGTGA?si=rVB8cRSsJoguuGXZ

There are lots of great clean and clean-ish tones to be had in this circuit. It's one of my favorite amps.

Glad to see you take the plunge! I still play my #005 build quite regularly and it's one of my favorites. It feels a lot like a Marshall amp in many respects. very punchy

I build this tube harmonic tremolo/reverb/delay awhile back as a standalone. Was a lot of fun.

https://www.youtube.com/watch?v=svyNWLn ... wPh4AaABAg

Around the 3 minute mark i dig into the delay bit.