[Boatanchors] Knightkit T60 Questions.
coolbrucelong at yahoo.com
Tue Jan 6 16:43:10 EST 2015
I have no specific knowledge of the T60 but on general good engineering principals,I'd voltage regulate at least the oscillator stage. It is cheap and not hard to do.
I don't know your technical background but I can do a amplified zener shunt regulator for you or a series regulator for you if you like. I've don't a couple high voltage regulator designs at work in the last year or so and can alter an existing design if you like.
I might even have some circuit boards that can be made to work in your application maybe with a couple cut traces.
From: "bcarling at cfl.rr.com" <bcarling at cfl.rr.com>
To: boatanchors at puck.nether.net
Sent: Tuesday, January 6, 2015 9:00 AM
Subject: [Boatanchors] Knightkit T60 Questions.
Dear fellow Boatanchor Ops,
I recently bought a nice looking old Knightkit T60 from a friend in preparation for
the Novice Rig Roundup coming up in February 2015.
However, it chirps. I replaced all the fixed caps with Tom's Hayseed
Hamfest kit. No improvement ensued, but great insurance against future failures. I observe that
the osc plate voltage drops from around 320V to 215V when keyed down. This being derived from
the same source as the buffer screen supply. I tried replacing the 8.2K 2 watt
resistor which was up around 9K. That hasn't helped either.
What would you try next? I am thinking about replacing the two tubes, 6HF8
and 6DQ6B, but that would make it a very expensive T60. I also thought anbout putting in
a 185v regulator but have my doubts. This transmitter should not chirp this much.
73 - Bry AF4K
Brian Carling, Radio AF4K
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