Tube Amp Archive

It's biased at 94% of max dissipation. (JJ 5881 has 23W max dissipation) to be ontopic, the best for SE use is to keep the dissipation lower, 70%, (i wouldnt even go to 80%), not 95% - you will lost 1W, your ear cannot hear that, but your tube will be grateful and life extened. It's biased at 94% o...

Link:
https://el34world.com/Forum/index.php?topic=29132.0

This was a very interesting topic about screen currents and screen resistors. I thinks it's worth checking out!

Just how are you getting 360 volts out of a dc to dc Converter that’s rated at a max of 250 volts? Here’s some info on running 5881 in class A like you are. Your screen voltage as you can see is far too high. Hmm. interesting.. When I ordered that converter, it clearly stated around 400v-450v max. ...

It's been a long time since my last upload..
I've been busy lately..
But, finally here's the video! with a sound demo.

It's paired with Dumble SSS preamp, with celestion vintage 30 speaker.


https://youtu.be/ZmnO8MMYe9k

Thanks for watching!

siickkk!!! Awesome video!! Great tones. Many WOW! Bitchin'! Great work! Thanks for all the complements guys! After watching/hearing this video, I thought to myself : ... and would you think of commercializing a such product ? Even going further: by be able to provide different preamps? (Robben, Rip...

It's been a long time since my last upload..
I've been busy lately..
But, finally here's the video! with a sound demo.

It's paired with a 5881 single ended (class A) power amp, with celestion vintage 30 speaker.

https://youtu.be/Aw5sZy5RcD8

bepone wrote: ↑Fri Aug 11, 2023 6:38 am a lot of svitchers (and generated noise) for that simple circuit

Actually it wasn't the circuit, just bad grounding. Solved it by simply moving some ground point, which took me 2 months to figure out.

This was my recent project. My first project was this preamp project: a SMPS powered tube preamp(Dumble SSS#002), mountable on a pedalboard. and it was a great success : https://ampgarage.com/forum/viewtopic.php?t=36345 Then my second thought was "how about a power amp on a same form factor?" 202308...

I want to hear and see the smps power amp :shock: Unlike preamp tubes, power amp tubes need much more power. It was nearly impossible to supply 3 tubes with a single SMPS, so instead of a push-pull design, I decided to build a single-ended design. I tried building it with a 30W 6L6GC powertube, but...

Wow. Impressive work. Would love to see a video of this. This is so cool! Really would like to hear this pedal. I'm al too familiar with SMPS induced hum. On my latest SMPS project, a clone of the Fishman rechargeable backplate, I ended up with extra C-L-C filtering at input and output of the SMPS....

Hi, I just finished my dumble sss #002 preamp project recently, and wanted to share. final gutshot.jpg final.jpg Inspired by ''peace hill fx' preamp pedals, I decided to make one similar. I used schematic from here. and only used the preamp portion. https://github.com/colganr/steel-string-singer-sn-...