[Hallicrafters] HT-37 low voltage rectifier

[Edward B Richards]

NO. Just one resistor right at the cathode of the diodes.

Ed Richards K6UUZ


On Sat, 08 Nov 2003 14:53:29 +0500 Bill <k2wh at optonline.net> writes:
> 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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