[R-390] R390 B+ Current?

[jgedde at optonline.net]

Thanks Don,

I will check C607.  The 5651's have already been replaced with one's I
tested to be good.

John

-----Original Message-----
From: Don Heywood <wc4g at knology.net> 
Sent: Friday, May 24, 2019 9:29 AM
To: jgedde at optonline.net
Subject: Re: [R-390] R390 B+ Current?

Hi John, maybe I can be of some help. I have attached a schematic of the
regulator circuit showing what I think you should look at besides what
Jacques mentioned. A leaky C607 will give you problems also.
I have had to substitute the two circled tubes in the past to achieve the
180VDC, and I always change those two resistors.

-----Original Message-----
From: jgedde at optonline.net
Sent: Friday, May 24, 2019 7:49 AM
To: 'r390a'
Subject: [R-390] R390 B+ Current?

I'm still having trouble with the voltage regulator.  Low B+ and a hum.
There's plenty of input voltage available, but the output isn't right.
Right now I have a 180V bench supply feeding the radio through the B+ test
point and all is working but the current is seemingly high.  I see about 170
mA.  Does this sound right?  It may well be, but I want to make sure I'm not
trying to fix the wrong thing.



John

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