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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 19th December 2010, 04:30 PM   #11
w5jag is offline w5jag  United States
diyAudio Member
Join Date: Feb 2007
Location: Arkansas

If you look at the T3 Sec and T2 Sec terminals, you will see that they are configured as follows: one of the two terminals connects to the negative lead of the cathode bypass capacitor, and the other is connected to the ground plane of the printed circuit board, thus when these two terminals are jumpered, the negative lead of the cathode bypass capacitor is grounded.

I use an unconventional method of cathode bypass with my Hammond 125ESE as detailed above: remove the jumper, and connect an unused secondary lead to the T2/T3 Sec terminal that connects to the negative lead of the same side cathode bypass capacitor. Nothing more needs to be done. I'm sorry I can't be more explicit and give you the exact pin number - I'm at our secondary residence and have no simple se board handy. Perhaps someone else does.

BTW, your pictures above show considerable plate glow on one of your EL34's. If you can see this glow with the unaided eye, that tube is bad. Discard it and replace it with a good one.

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