Just a quick update on this thread...
Instead of flipping the "faulty" board I chose to go the long way and leave the board orientation, but change the pinout. This is quite adventurous since you have to cut approx. 18 traces and reconnect them correctly. The cutting actually was done quite fast while the reconnecting wasn't. Didn't want to mess up the topology!
But everything went fine, and after triplechecking every connection I dared to flip the switch again...and it works...!
I am also using parafeed output transformers (Hammond 116DA traded from dsavitsk) on this one, and they do sound fine...as does the entire amp. Very very convincing (!!) even with temporary wiring, "just" regular EH 6CG7 (RCA's waiting...) in the first stage and the heaters not lifted.
<<Side question: How do I lift a regulated heater supply? By connecting the divider network to the return side of the regulator, or by forming a "virtual centertap" with two resistors?>>
Another side note: the amp has NO hum... and I mean, NO hum at all!! So Broskie's implemenattion of a starground and the hum cancelling definitely work.
Instead of flipping the "faulty" board I chose to go the long way and leave the board orientation, but change the pinout. This is quite adventurous since you have to cut approx. 18 traces and reconnect them correctly. The cutting actually was done quite fast while the reconnecting wasn't. Didn't want to mess up the topology!
But everything went fine, and after triplechecking every connection I dared to flip the switch again...and it works...!
I am also using parafeed output transformers (Hammond 116DA traded from dsavitsk) on this one, and they do sound fine...as does the entire amp. Very very convincing (!!) even with temporary wiring, "just" regular EH 6CG7 (RCA's waiting...) in the first stage and the heaters not lifted.
<<Side question: How do I lift a regulated heater supply? By connecting the divider network to the return side of the regulator, or by forming a "virtual centertap" with two resistors?>>
Another side note: the amp has NO hum... and I mean, NO hum at all!! So Broskie's implemenattion of a starground and the hum cancelling definitely work.
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