[R-390] Selenium Rectifier

[Barry]

Tim,

That's close enough.  I figured an amp or two would be a sufficient rating
for a replacement rectifier.  K101A and K101B are all that's powered by the
rectifier, right?  I'm not looking at the schematic, but does anyone know if
the break-in relay is also powered from this rectifier?  I don't recall
seeing it in this line, but it would seem it needs DC from somewhere...

Thanks!

Barry - N4BUQ

----- Original Message ----- 
From: "Tim Shoppa" <shoppa_r390a at trailing-edge.com>
To: <r-390 at mailman.qth.net>
Sent: Thursday, November 17, 2005 5:19 AM
Subject: Re: [R-390] Selenium Rectifier


> Barry asks:
> > Anyone know how much current K101A and K101B pull?
>
> The two windings in parallel are about 100 ohms.
>
> They're fed with pulsating 25.6*1.4 = 35VDC peak DC (minus
> selenium rectifier losses) which would mean maybe 200mA current
> if driven by pure DC.  But I suspect inductive impedance means that
> actual current draw is much much less when fed with pulsating DC,
> my gut feeling just looking at the selenium rectifier and size
> of the relay coils that it's like 40 or 50mA.
>
> Yeah, I know, you asked for a real measurement, not a gut feeling :-).
>
> If you can wait until this weekend I can put a resistor in series
> with the selenium bridge and see what the actual current draw is
> (my blue striper had a smashed-up selenium bridge I gotta replace
> too!)
>
> Tim.
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