[Hallicrafters] HY37 HV and bias voltages

Joseph Trombino Jr w2kj at bellsouth.net
Thu Aug 4 14:35:32 EDT 2005


I just replaced the electrolytic caps in my HT37 and added the Weber Copper 
Top solid state rectifiers to replace the 5R4 and 5V4 tubes.

My HV now reads +907 VDC and the bias is -65VDC.

(I didn't do any measurements before the replacement job since I didn't want 
to take a chance with a bad cap and blow the power transformer)

Believe I can try and adjust the bias voltage down to the recommended -49 
but am wondering if the higher HV is OK.

Wonder if the solid state rectifiers are the reason for the higher 
HV.....the book indicates that the HV should be +750.

Ideas comments are welcomed.

                                   73, Joe W2KJ
                                   Trying to get a vintage station on the 
air 





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