[Boatanchors] Knightkit T60 Questions.
bcarling at cfl.rr.com
Tue Jan 6 18:56:16 EST 2015
The problem has been fixed! I'm happy to report that simply adding an OA2 regulator a tube has resulted in a clean signal. However I have noted that the interstage tuned circuit is not resonating properly on 40 m and the drive tuning control has to be set with the capacitor all the way open. Several other users of T 60 rigs have noted The same problem and had to remove three or four turns from the 40 m coil in order to get it to resonate properly.
I'm using those remanufactured FT 243 crystals from AF4K, hi hi. It sounds great now and I just made a contact with the station in Cuba who is running 7 W on 7110 kHz. My Signal report from the T 60 running 38 Watts: RST 599.
Best regards - Brian Carling
AF4K Crystals Co.
117 Sterling Pine St.
Sanford, FL 32773
Tel: +USA 321-262-5471
> On Jan 6, 2015, at 9:00 AM, bcarling at cfl.rr.com wrote:
> 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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