[Amps] Tl- 922

[Jim Thomson]

Date: Wed, 15 Jul 2020 03:52:26 -0400
From: Artek Manuals <Manuals at ArtekManuals.com>
To: "amps at Contesting.com" <amps at contesting.com>
Subject: Re: [Amps] Tl- 922

<Ahh I see now that there ( at least) three R7's on the schematic one on 
<HV Rectifier Stack X43-1290-01 and one on the Meter Shunt board 
<X54-1300-10 and one on the main chassis !

<As a previous poster noted remove the tubes one at a time

<Dave

<NR1DX

##  Problem is... the  fils are wired in  SERIES !   Remove either tube, and the remaining  tube  will not light up.
Henry radio did the same thing on their  2 x 3-500Z amps.   Fils in series is not a smart idea.   And for what,  so they can use
14 gauge magnet wire..instead of  10 gauge on the  bifilar  fil  choke.   They saved all of a few pennies. 

##  That grid to fil short happens..after the fil has heated up.  You wont see the short, with tube out of socket.

##  The  TL-9222  uses a 10 V  @  15A  fil xfmr.   So dont short out one  fil...or the remaining tube  will have a full 10 V  on it. 

Jim   VE7RF