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Post by Marc on Jan 29, 2009 14:48:28 GMT -5
The receive volume on my MK III receiver is slowly dropping.
I was thinking that it is a tube issue but just wanted some opinions.
Signal strength has not changed at all.
Marc.
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Post by mark4 on Jan 29, 2009 20:08:43 GMT -5
Try replacing C237 8uf150V
and C239 5uf50V electrolytic capacitors.
Bet C237 took a dump!
This is one of the big reasons for a 100,000 mile tune up.
They go bad one by one. Soon as you replace one the radio
has another issue.
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Post by Marc on Jan 30, 2009 10:51:58 GMT -5
Looked at the schematic could not find a C237??
But if your talking about the caps conected to pin 8 of V9 and
Pin 2 of v10 then we got a match?
Marc
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Post by mark4 on Jan 30, 2009 18:31:25 GMT -5
Sorry, You said MarkIII.
You should have a 4uf150V cap. (C64) this is tied to pin 8 of V9. (12AX7)
Danger! High voltages are present. Work should only be performed by a qualified tech. Thought I would mention that fact.
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Post by Marc on Jan 30, 2009 18:46:46 GMT -5
Well it was C64 a 5 MFD 150 V cap. so it is all well now thanks to all.
Marc
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Post by mark4 on Jan 30, 2009 19:35:25 GMT -5
Yes, I was changing my post as you were reading it.
I am building a MarkIV right now. Have the IV on the brain.
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Post by Marc on Jan 31, 2009 9:44:53 GMT -5
I used to do that with my 148gtl and 2000 unit all the time.
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