[Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!!

[Mark K3MSB]

Paul

It's been a long time since I did this to my HT-37.

I would figure on a voltage increase of about 10V with the new diode.
Since it's a bias circuit,  figure low current, about 10 mA..

That would mean a resistance of about 1K.  A 1/2W resistor should be fine.

What is the RMS voltage of the tap that's feeding the diode?  Whatever it
is,  multiple by 1.414 to get the peak rating for the diode.

Diodes and resistors as dirt cheap;  I'd oversize the heck out of both of
them.....

73 Mark K3MSB


Mark K3MSB




On Tue, Dec 29, 2015 at 8:14 PM, Paul Mobley <a69galaxie500xl at comcast.net>
wrote:

> Please, can anyone give me detailed info on replacing selenium rectifier
> in my HT-37, with diode. I am a beginner with electronics and having real
> trouble trying to understand the whole bias supply circuit. I don't know
> what value of dropping resistor to use and am confused as to weather the
> resistor should go to the anode or the cathode side of the diode. The whole
> negative voltage bias thing is very confusing. Please help!
>
> Thanks,
> Paul
>
> Sent from my iPhone
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