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Model 84 late buzz( 1935 run)
MrFixr55
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#5

03-16-2025, 10:55 PM
Hi Bruce,

I am looking at the pic. Seems that the 2 filter caps are sharing a common negative. That common negative appears to be connected to a non-grounded pin of the AC power input filter cap. The common negative of the filter caps should connect to the center tap of the HV winding (rectifier plate winding) of the power transformer. A 325 Ohm resistor connects this center tap to ground. this resistor is bypassed by a 0.015uFcap. In addition, the values of these filter caps should be higher. The schematic states 8uF and 4uF. You can go a little higher. It appears that one of these caps in only 1uF unless a number is covered or backed out

Hope I am right. Hope this helps.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis

Best Regards, 

MrFixr55
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Messages In This Thread
Model 84 late buzz( 1935 run) - by Bruce - 03-04-2025, 10:06 AM
RE: Model 84 late buzz( 1935 run) - by morzh - 03-04-2025, 10:25 AM
RE: Model 84 late buzz( 1935 run) - by Bruce - 03-06-2025, 08:22 AM
RE: Model 84 late buzz( 1935 run) - by morzh - 03-06-2025, 09:05 AM
RE: Model 84 late buzz( 1935 run) - by MrFixr55 - 03-16-2025, 10:55 PM



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