[Hallicrafters] HT-37 low voltage rectifier

[Bill]

Wouldn't replacing the old tube rectifier with a solid state 
unit send the B+ voltage soaring?  Way above what the tube
rectifier would have delivered?  If so, wouldn't one have to
replace all the resistors in the rig to compensate for the
higher voltage?

K2WH

-----Original Message-----
From: hallicrafters-admin at mailman.qth.net
[mailto:hallicrafters-admin at mailman.qth.net]On Behalf Of Al Parker
Sent: Sunday, November 09, 2003 0:43 AM
To: Riley Hollingsworth; hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] HT-37 low voltage rectifier


Hi Riley,
    I'd suspect a problem with that SS plug-in.  Diodes in backward, or
shorted, or perhaps wired to pin 8 instead of pin 2, or pins 2 & 8 shorted
together.  Sounds like the filament winding may be shorted by pins 2 & 8
of the SS unit.  I wonder why someone said not to do the LV section?
hope this helps,
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info

(I didn't see your msg until 2:26PM)

----- Original Message ----- 
From: "Riley Hollingsworth" <rholling at adelphia.net>
To: <hallicrafters at mailman.qth.net>
Sent: Friday, November 07, 2003 8:17 AM
Subject: [Hallicrafters] HT-37 low voltage rectifier


> I have re-capped the HT-37, gone over it and fired it up.  I haven't
loaded
> it yet. I noticed a medium level buzz in the power transformer that
> disappears when I take the low voltage solid state replacement out and
put
> the 5V4 back in.  I'll just leave the tube in to do the performance
test,
> but why would it cause the transformer to buzz ? The transformer is
> perfectly quiet without the solid state LV.  I think at least one e mail
> said to not replace the LV rectifier with a solid state---looks as if
I'm
> about to find out why!
>
>


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