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Re: [Amps] Hallicrafters HT-41

To: amps <>
Subject: Re: [Amps] Hallicrafters HT-41
From: Ron Youvan <>
Date: Sun, 8 Nov 2015 08:27:21 -0500
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  On 11/07/2015 06:33 AM, James KL7JBB Branch wrote:

I'm going through an HT-41 billed as "plug and play" which arrived with a solid 
state conversion replacing the two 866AX rectifier tubes. The conversion consists of a 
plexiglas rectangle with multiple solid state rectifiers in series, brass pins to plug 
into the tube sockets and small lengths of copper pipe to engage the plate leads. 
Overall, it 's a nice job and importantly (to me) completely reversible.

I'm concerned that this solid state rectifier setup will have a lower forward 
voltage drop than the 866AXs and present too high a voltage to my pricey 7094s. 
I have a high voltage probe for my DMM on order to check this, but thought I'd 
poll the group on how to proceed. Any advice on this rig will be appreciated.

  Look in the essential characteristics book at the specifications for
the 866AX rectifier tubes, what forward Voltage drop is listed?
Multiply the number of diodes in one string by 0.6 Volts then subtract
that from the forward Voltage drop of the 866AX rectifier tube and that
is approximately how much more Voltage that you will have.
  With most transmitting tubes you can easily double the plate Voltage
without harm.
  Ron  KA4INM - Youvan's corollary:
                Every action results in unwanted side effects.
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