Question: HR-10B Power Transformer

[Ed Richards]

Mike;
Maybe your problem is that the power industry is working toward raising
the standard power line voltage a little at a time. When I was a kid it
was 110 volts. I have seen it go to 113 VAC, 115 VAC, 117 VAC, 120 VAC
and the official voltage now is 122 VAC.. If you are working with a
transformer designed when the voltage was lower it may account for the
problem. I put a resistor in the primary to drop all the voltages down
where they belong. The Europeans were smart enough to start out with 220
VAC in the first place.
Regards, Ed Richards

On Mon, 5 Apr 1999 15:18:28 -0700 Mike Hardie <hardiem at INTERGATE.BC.CA>
writes:
>Help!  I'm working on a dead HR-10B and have found the B+ to be well
>above
>specs. (Cofirmed with two different voltmeters.)  According to the
>schematic the transformer should be putting out 410 vac but its
>actually
>around 450, just at my "personal limit" of +/- 10%.  Downstream of the
>6X4
>rectifier things get worse likely because of the RMS to d.c.
>multiplying of
>1.4.  All the other B+ related voltages are also high.  The
>transformer
>doesn't seem to run hot but the 1500 ohm 10w resistor in the power
>supply
>sure does.  Anyone else had this problem?
>
>Mike at: hardiem at intergate.bc.ca
>
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