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

[Scott Roberts]

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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