Right channel missing in action with new build Cornet

Julien43 · « **on:** 4 May 2005, 01:07 am »

Hello,
I finially wired up the step-up and did a smoke test on the Cornet. Everything appeared ok. the B+ voltage was 325V when I put the step-up and Cornet in my system I got a crackling noise from the right channel. The left channel played fine. I swapped inputs and the symptoms were the same. I've done something wrong with the Cornet right channel. Can someone point me in the right direction. Damn, I've been looking forward to this for a long time!
TIA for your response

hagtech · « **Reply #1 on:** 4 May 2005, 06:04 am »

Much easier if you have a scope. Do you get anything out of the bad channel? Any noise or hum? Are all plate voltages ok? Check cathode voltages too. If all dc measures ok, I'd guess a short somewhere in the signal path.

jh

Julien43 · « **Reply #2 on:** 5 May 2005, 10:31 am »

I don't know if they'll help but here they are:

B+330V after R2 139V

R3L 197V - 100V

R3R 130V - 270V

R6L 221V - 217V

R2R 296V - 298V
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Eric H · « **Reply #3 on:** 5 May 2005, 09:39 pm »

Voltages seem to differ between the channels but could just be your tubes, I think - I saw some strange voltages with some of my old tubes. Have you tried swapping in some other tubes? Also recheck the installation and wiring of the input and output jacks... you've probably done that. Good luck...

Julien43 · « **Reply #4 on:** 12 May 2005, 06:35 pm »

Thanks Eric... I don't have more tubes. It may be awhile. I'm not too liquid at this moment

hagtech · « **Reply #5 on:** 13 May 2005, 01:04 am »

Something way wrong with left channel. I'd guess bad V1 or wron resistor value somewhere (R4?). Try running machine without V1. Then see if supply voltages come back up. They should be very close between channels.

jh