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In Reply to: RE: Low Voltage to Heaters posted by Caucasian Blackplate on July 19, 2015 at 10:59:37
CB, I Followed your advice and put the KBU4's back in there. As well as all the 1R resistors on the (low voltage/problem) amp.
The good amp is up to 12.57v after the last resistor so I've gained 0.5v.
The other amp, with the 1R resistors now(3) back in I'm only getting 9.5v?
I measured the current draw, good amp 0.6A, bad amp 0.5A (lifted the wire from the final resistor and used crocodile clips to run through my mm ( hope this was right?)
I had both amps up on the bench and tested every resistor in the linestage and the two caps and they all are correct as well as reading the same both sides, I cant check the 4700uf cap as my esr meter goes out of range.
I need some help here, have no idea what to do next?
(Just fyi am running film caps 100uf in the linestage, was advised this would be fine, removed lytics)I bypassed these with soviet silver mica's.
Follow Ups:
"I measured the current draw, good amp 0.6A, bad amp 0.5A (lifted the wire from the final resistor and used crocodile clips to run through my mm"
Are you unable to measure voltages on all the resistors like I suggested earlier? That's the way to get to the bottom of this problem quickly. Really, reinstalling the original diodes was a complete waste of time without making those measurements first. At this point, it appears one of the resistors ahead of the bridge in the bad channel might have increased in value. It's also possible the 4,700u in that channel is failing. Lacking an ESR meter, you could swap the caps and check whether the problem changes channels.
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Buy Chinese. Bury freedom.
The resistors are all good, brand new mills MRA's tested!
That only leaves the 4700uf cap, I'll drop in another lytic in a few days just to see if the voltage returns to normal, if so I'll order "another" mundorf m-lytic, I didn't suspect this cap "too" much because I thought these m-lytics were supposed to have a very long lifespan/were bulletproof.
Yay, I hope this is it....
Will post results..
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