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Dynaco-Doctor Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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Dynaco-Doctor Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: i Channel Dynaco st70 posted by paul cbc on May 22, 2003 at 05:48:51:
Check to saee if the 15.6 ohm resistor (on the output tubes pins 1 & 8) is open on the side with the high bias (43.6 vdc).If you find that it has opened (high resistance)it is probable that one of the output tubes on that side went into saturation (high current). If you don't wish to risk further damage to the output tubes it's probably time to replace the output tube sockets and associated solder connections (and wire).
Also, the 1.7 volt bias (on the good side) is indicative of a problem with the bias circuit. You may want to try implimenting the "bias expansion tweak" that I have posted on the dynaco-doctor site. You should also check (and possibly change out) the selenium rectifier.
Let us know how it works out
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Follow Ups
- Re: i Channel Dynaco st70 - Joe Curcio 07:52:35 05/22/03 (5)
- Re: 1 Channel Dynaco st70 - paul cbc 20:09:25 05/22/03 (4)
- Re: 1 Channel Dynaco st70 - Joe Curcio 22:17:40 05/22/03 (3)
- Re: 1 Channel Dynaco st70 - paul cbc 18:57:07 05/23/03 (2)
- Re: 1 Channel Dynaco st70 - paul cbc 18:43:45 05/25/03 (1)
- Re: Why 3 watt cathode resistors? - Russ57 10:26:20 05/28/03 (0)
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