[NJARC] Fw: [From Your Hallicrafters Reflector] Re: HT-37 Question!

[jr6v6gt at yahoo.com]

Hi Joe,

Why such a husky diode, just for a *bias* supply? I would think 2KV .5 or 1 amp would be plenty.

John R.

--- On Wed, 6/17/09, JOE CRO <n3ibx at verizon.net> wrote:

> From: JOE CRO <n3ibx at verizon.net>
> Subject: Re: [NJARC] Fw: [From Your Hallicrafters Reflector] Re: HT-37 Question!
> To: "Scott Roberts" <ng19delta at yahoo.com>, "NJARC Radio Club" <njarc at mailman.qth.net>
> Date: Wednesday, June 17, 2009, 2:06 PM
> Just remember 
> Reply = Poster
> Reply All = Everyone
> 
> _________________________________________________________
> Scott- I stand corrected! Make that a 2-3KV 3 amp diode if
> possible.
> 73 de N3IBX
> ----- Original Message ----- 
> From: "Scott Roberts" <ng19delta at yahoo.com>
> To: "NJARC Radio Club" <njarc at mailman.qth.net>
> Sent: Wednesday, June 17, 2009 12:46 PM
> Subject: [NJARC] Fw: [From Your Hallicrafters Reflector]
> Re: HT-37 Question!
> 
> 
> Just remember
> Reply = Poster
> Reply All = Everyone
> 
> _________________________________________________________
> 
> 
> Hi Everyone-
> I am forwarding this to ask if anyone could help me with
> the concept of 
> replacing the Selenium Rectifier in the HT-37... It is of
> the little metal 
> can type, not the flat stacked plate type. As the reply
> below says, the 
> series resistor will need to be changed as well. I am still
> useless when 
> figuring things beyond the original schematic. Any ideas
> what value resistor 
> I should use, and the best recommendation for a silicon
> diode?
> 
> Thanks!
> Scott
> --- On Wed, 6/17/09, William <k2wh at optonline.net>
> wrote:
> 
> > From: William <k2wh at optonline.net>
> > Subject: [From Your Hallicrafters Reflector] Re: HT-37
> Question!
> > To: HallicraftersRadios at yahoogroups.com
> > Date: Wednesday, June 17, 2009, 6:47 AM
> > Yes change the rectifier to a silicon
> > device. However, due to the large voltage increase
> > from using a silicon device, you will also need to
> increase
> > the value of the series bias resistor to lower the
> bias
> > supply voltage otherwise, you will not be able to
> adjust it
> > properly with the bias adjustment pot.
> >
> > K2WH
> >
> > --- In HallicraftersRadios at yahoogroups.com,
> > Scott Roberts <ng19delta at ...> wrote:
> > >
> > >
> > > Hi Guys-
> > > I am finishing up my HT-37 transformer
> > installation(beautifully rewound by TRS) and I had a
> quick
> > question. I noticed a small, metal can looking thing
> near
> > the transformer, and found it is listed as "SR1",
> which is
> > described as a Selenium Rectifier. Since it is being
> used as
> > a diode, is it possible, or advisable, to swap in a
> 1N4007
> > as a replacement diode, as Seleniums are one step away
> from
> > Armageddon, from what I hear?
> > >
> > > I could use an answer today, as I'd like to test
> out
> > the unit & close it up, & maybe get it ON THE
> AIR
> > finally!(Only been 3 years!)
> > >
> > > Thanks!
> > >
> > > Scott
> > >
> >
> >
> >
> >
> > ------------------------------------
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