[ARC5] Surplus Disposal

[hwhall at compuserve.com]

>Just curious. How do you modify a 1625 ??
 

 Certain brands had the beam forming grids brought out of the glass & connected to the cathode inside the phenolic octal base. You could remove the base or cut a hole in it and rewire the beam forming grid to a separate pin, for three independent grids. I think the standard practice then was to ground all the grids & run the tubes as grounded grid amplifiers that typically needed no neutralization.

--Wayne
  WB4OGM

 

-----Original Message-----
From: KR4OJ <kr44oj at charter.net>
To: Fuqua, Bill L <wlfuqu00 at uky.edu>; arc5 <arc5 at mailman.qth.net>
Sent: Mon, Jan 9, 2012 11:19 pm
Subject: Re: [ARC5] Surplus Disposal


WA4LAV wrote....
> P&H had a linear amplifier LA-400 which had 4 modified 1625's and 
> capacitor
>and roller inductor from ARC 5...........

Just curious. How do you modify a 1625 ??

Jess  KR4OJ 

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