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I just tested the output and I indeed get something between C2 and R6 (not very boosted, if boosted at all). I then tested where C11 and R35 meet, right before the OD section. I also get sound there, significantly more boosted than the previous test, however there is something I can't really...

Ok so, breadboard was assembled completely.. obviously it didn't work, as I only get a sort strong background noise (I connected the guitar directly in the input, as the output to a mixer). I would have many questions, but perhaps the fundamental one in regards to debugging the issue is...

Perhaps I'm missing a very easy point, but if you have two filaments with no center tap (and thus only two pins), how can I have 6.3V over each of the filaments? I know its a very stupid question but wouldn't running one pin to the power supply (6.3V) and the other to ground just give 6.3V over...

One question, what is the configuration if the tube doesn't have a center tap (like pin 9) and you are running it via 6.3 Volt DC supply? Is creating a virtual center tap the only way to go?

Sorry for not answering, I appreciated your explanation. I just received the tubes, so soon I will hopefully have a first sound test from the breadboard :)

I was expecting less output voltage, when the project was first posted I remember the output voltage of the smps was said to be around 200V. 370V felt a bit too much by following more or less the same circuit. Also by non linearity I also mean that there is a point in the trimmer resistor where...

Ok I ordered a bunch of https://www.mouser.se/ProductDetail/78-SIHA18N60E-E3 for Q3, and BC549CTA transistors for Q2 which I really hope would get the job done 😅

Hey @vigilante398, forgive me for bringing you up again but I'm facing a small doubt. While waiting for the tubes to arrive I have assembled the breadboard completely, including the SMPS. When testing (with a multimeter, no load) the SMPS I am noticing some strange behaviour: the output voltage...

Yes that is correct, it was his build :) Thanks for the help, I feel a bit more confident now. I will update on the results!

Thanks a lot for the answer! And yes! It's that one (not sure what happened with my attachment). Since you recognised it immediately, have you by any chance already gave it a shot? Anyways, I understand your approach, but I guess it partially comes from your experience of knowing with pretty...

Hi, I'm writing because I'm planning on making a tube preamp pedal starting from a schematic I found, however it's my starting point with tubes (also thanks to @vigilante398 for the great 101 & 102 entry level guides :) ) at relatively high voltage and I would like to be as safe as possible...