Tube Amp Archive

Incredible work!

Roe wrote: ↑Wed Apr 30, 2025 9:35 am It affects blocking distortion and recovery speed more than bass response. The lower values give a faster response with tighter bass. Even 15nf works well (w. 220k bias splitters).

Good to know

I can't imagine that it will have a noticeable impact as the high pass filter cutoff shifts from ~ 7 Hz to 15 Hz (edit: 47n to 22n).
Well below the guitar frequency range.

R.G. wrote: ↑Sat Apr 26, 2025 2:12 pm
Sure!

https://www.dropbox.com/scl/fi/vpijj3al ... x3oay&dl=0

Thank you very much!

R.G. wrote: ↑Fri Apr 25, 2025 6:07 pm
Yell if you want the link to the full article.

Would be great to see the full article

martin manning wrote: ↑Sat Feb 22, 2025 4:14 pm Have you tried Ihor's uT JS? It has a double acquisition mode that adjusts the set voltage up to hit the target.

The double acquisition mode helps

Hi Martin, yes, I'm running Ronald's GUI v3.12.6 I measured the voltages directly at C13 and C18 versus cathode. All the measurements were done in continuous mode, i.e. anode/screen directly connected to the reservoir capacitors C13 and C18. I have tried uT JS and see the same. What puzzles me is th...

I've got some weird phenomenon going on with my µTracer 3+. Calibration of Va and Vs is fine (measured in continuous mode between C13 and C18 and cathode). When I run the µTracer it indicated lower voltages than what why DMM measures (the same one that was used for calibration). The first table show...

I had these made through a local company here in Germany. It set me back a whopping 220€ and it isn't even painted haha! In hindsight I should've probably looked for someone that would be able to powdercoat and screenprint but taking into account that this is only for a single build that's okay for...

I had these made through a local company here in Germany. It set me back a whopping 220€ and it isn't even painted haha! In hindsight I should've probably looked for someone that would be able to powdercoat and screenprint but taking into account that this is only for a single build that's okay for...

captaincoconut wrote: ↑Wed Jan 15, 2025 11:03 am https://www.schaeffer-ag.de/ - came out at around 150€ but the quality is top notch.

Thanks!
Yes, they look great!

Where did you order the faceplates?

Sadly, a lot of modern tubes are microphonic. JJ output tubes seem especially prone to it, so much that it's amusing and sad that their distributor sells a lot of dampener rings to try to help mitigate the rattles. A lot of old production tubes were microphonic, too, but specific tube types were de...

Yes, a poor connection will impede current flow which in turn will slow the voltage rise to that tube and make for the same tube reaction that I posted about earlier. I you have a veriac at your disposal you can simulate that same issue by bringing up the voltage to the amp slowly. Unfortunately, I...

xtian wrote: ↑Mon Jan 06, 2025 4:50 pm Good job. Chopsticking is an important talent.

Thanks for your support!

xtian wrote: ↑Mon Jan 06, 2025 4:50 pm When connections are BARELY connected (like broken solder joint) you can get all kinds of mysterious noises, like icebergs slowing breaking apart.