The Amp Garage

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.

Pitted and oxidized stand by switches make INTERMITTENT noises. It's easy to test, just use an alligator clip to connect the switch's two terminals. I checked the standby switch by bridging it with an alligator clip but it didn't help. I then started to re-flow the solder joints in the power supply...