mk 2 master volume

[LivewireBlanco]

I'm pretty sure el34s and 6550s are direct replacements.

No, bias settings are different hence the resistor value change on the 6550 export models.

Yeah, I meant no major changes like transformers or anything like that. Always bias power tubes whenever you change them.

[Herbvis]

I was having a volume problem today when testing the amp. Found that i had an improper ground from the vi preamp tubes. I was able to remedy this and the amp have its volume back and sounds great. However, I still can't get a mv reading when trying to bias the power tubes. I think they may be a bit hot as well. Could they be red plating? What areas should i bee troubleshooting?

-- BTW, I finished remodding and cleaning up my Metro 2203 afd build. I posted a pic on the AFD 100 thread. Check it out