Date: Wed, 15 Jul 2020 03:52:26 -0400
From: Artek Manuals <Manuals@ArtekManuals.com>
To: "amps@Contesting.com" <amps@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
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