Metropoulos Forum

Hi..i am a new user here. As per my knowledge If your meter is auto-ranging, it should find the correct scale on it's own as long as you are set to DC voltage. Two things that could also cause a problem are weak batteries in your meter and the possibility that you used a 10 ohm resistor on each socket and not a 1 ohm. The 10 ohm would still allow you to check your bias but your actual reading would be off by a factor of ten.

one-stop pcb

Thanks for the post, but I definitely said 1ohm in the first post. As I stated already, the bias range resistor Just wasn’t the correct value. The kit came with a 27k, but I needed a 33 or 47k to get the bias voltage where it needed to be. No big deal, but I worried a little that maybe that was just too easy, and the problem was bigger. Thankfully there are guys like us that subscribe to this message board and assist folks, or I probably would’ve pulled the rest of my hair out.

Anyway, thanks for your reply, nice to see folks are always willing to help out...you never know when a problem will hit you, and after all of that work, sometimes it’s tough to see easy fixes right in front of you!

If you are swapping lots of tubes a different range pot is useful 0-100k for example.

Regarding the vol 1 bypass cap if you look at the interaction with the pot values a 500pF is very spiky. I tend to use a 100pF for amps that get used at lower volumes. The original lead amps all run 5,000pF, any thing else is a mod, and the plexis are usually very smooth in comparison with the metal panel amps.
What cap are you running on V2a and what NFB resistor/tap combo?
What sort of tones are you after?

Honestly I removed the bright cap completely, sounded much better! V2A cathode resistor/ cap combo are an 820/.68uf. NFB is a 100, attached to the output jack positive terminal. Was looking to heat up the power tubes without teeth grinding highs, so removing the bright cap got me there. Could’ve used a 100, but the lowest I had was a 250, and I figured that wouldn’t be enough. Turned out great!