In Reply to: I don't know yet posted by jellobrain on January 19, 2001 at 09:54:37:
Ok so I plugged everything in and tried again! NO DICE! First of all
once I had the input tube in I checked the voltages on it once again,
it looked right, anywhere from 130-210 VDC on the plate of the 5691.
BUT as all this was going on stange sounds where coming from my
speaker, kind of a popping spike-like sound. for a BRIEF second i
herad very faint and distorted music, BUT here is the kicker, the 45
cathode biasing resistors got VER VERY VERY VERY VERY VERY hot! So I
have to think that everything else seems right, EXCEPT the hole
cathode biasing affair! I think somehow it is wrong. I am not sure
how all this is SUPPOSEd to work with a DHT, what I have is 3
transformers, 1 for the main power, and 2 very small 2.5V 1.25A
filament transformers for the 45s, OK on the schematic it as "55V" on
the CT of the 45 filament transformers. So what the hell is this all
about?????????? Is there any way to DETERMINE if the bias is right? I
should add that during all this with the power in and the noises the
45's glow ould fluctuate severelly, becoming dim and then normal
bright! So what is next??
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Follow Ups
- Latest update - jellobrain 01/19/0117:20:17 01/19/01 (11)
- Re: Latest update - J Epstein 07:02:07 01/20/01 (10)
- FINALLY SOMETHING! - jellobrain 11:46:40 01/20/01 (9)
- Re: FINALLY SOMETHING! - J Epstein 12:51:16 01/20/01 (8)
- checking voltage - jellobrain 13:38:03 01/20/01 (7)
- Re: checking voltage - J Epstein 14:18:10 01/21/01 (5)
- My only recourse - jellobrain 17:12:30 01/21/01 (4)
- Re: My only recourse - J Epstein 18:24:12 01/21/01 (3)
- The follies of first time DIYing - jellobrain 12:02:56 01/22/01 (0)
- The follies of first time DIYing - jellobrain 10:58:57 01/22/01 (1)
- Well, the good thing is: - J Epstein 12:34:40 01/22/01 (0)
- Can any of you "experts" enlighten me? - jellobrain 10:22:00 01/21/01 (0)