09-06-2017, 08:20 PM
(09-06-2017, 07:56 PM)robsradioactive Wrote: Thanks again you guys! I swapped the 6A7 for a tested and, apparently, N.O.S. tube. That made a huge improvement.
I then tested the original 6A7 on my (calibrated) Hickok 600A and it showed [?] on the pentode section.
Turned the english to 73 and that made the meter read Gm of about 600/1000 (average new tube).
The oscillator section was fine at nearly 500/300(" ").
Emission tests good, so I must have originally just done an emission test (or maybe enhanced emission test depending on who you believe) on my Jackson 648. I don't know how else I could have missed that marginal tube.
Rob
Yep. Very typical.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
