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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: Re: Where does the negative wire go from pin to driver board posted by Carl B. on June 11, 2006 at 04:58:31:
with three 3 wires coming out of it should have the 2 outside legs connected to the center taps of the heater supply(s) and the middle leg needs to be connected to the central quad cap ground. This could be your main problem and would show up as hum. The cap is two caps built into one and can be replaced with 2 individual caps if needed.The stock design has the 1K resistors connected between the driver board and pin 5 of the EL34's. While that can be adequate it is not proper. It would be best to take advantage of the fact that pin 6 is not used on an EL34. What I advise is to run a short wire from driver board to pin 6 and then install the 1K resistor from pin 6 to pin 5. It is important that the resistor be a carbon resistor and not a metal film and that it leads be as short as possible, especially at pin 5. The 1K resistor is intended to surpress any oscillations which if audible could sound like a high pitched feedback type of whine.
In the end it may become necessary to replace the stock driver board.
Russ
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Follow Ups
- That ceramic cap - Russ57 07:00:54 06/11/06 (0)
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