Jean-Marie -
I don't have an SW-4A, but according to the manual that does seem high, and would cut off the RF and other AGC controlled stages.
1. C76 is most likely either a paper or ceramic capacitor rather than electrolytic.
2. The grids of V4 and V5 show -1.2V, and they are essentially connected directly to the top of C76.
2. The voltage at the "other end" of R55, the 2.2M resistor should be about -1 to -2 volts.
3. If R57 was open or much increased in value, there could be as much as -60V on the end of R55. This would be my first check!
A shorted Q4 is also a possibility. What are the voltage measurements on Q4?
Let us know what you find.
73, Garey - K4OAH Atlanta
CHERRY wrote:
Hello to the group,
Could you please told me the how many volt you have on the C76 ( little electrolytic condenser 0.1 MF/ 200VDC on the power board) of the SW-4A. I measure -24 volts and I think it is too much.
Your comments will be greatly appreciated.
73, Jean-Marie R.L. DRAKE VIRTUAL MUSEUM WebMaster
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