[TMC] XFK - AC leakage to chassis

[jvendely at cfl.rr.com]

Hey JP,

I wonder if you've ever come across the dwg for the type CR-109
crystals used in the AFC-2 and AFC-3? These appear to be special
low-Q, high pullability crystals. 

BTW, we TMC collectors are all eternally grateful for your continuing
work on your TMC website. And I'm not saying this simply to be
complementary. What a fantastic, comprehensive, detailed resource...

73,

John K9WT

	-----------------------------------------From: "John Poulton" 
To: "Nick England"
Cc: "tmc"
Sent: Sunday August 2 2020 11:15:18AM
Subject: Re: [TMC] XFK - AC leakage to chassis

After a long hiatus, I've been scanning TMC drawings again, currently
the
 B-size A- drawings (Assemblies) up to about 1957 so far. Just
happened to
 notice

 

Links:
------
[1] http://www.navy-radio.com/rtty-keyer.htm#oven
http://www.navy-radio.com/rtty-keyer.htm#oven
 /> > That's a thermostat next to one of the two 600 ohm/20w heater
elements.
 >
 > If this problem rears its ugly head in the future, I'll swap out
the
 > crystal oven heaters and try them - unfortunately that involves
removing
 > the power transformer whose terminals are buried beneath other
 > wiring.......
 >
 > Thanks to all,
 > Nick England K4NYW
 > www.navy-radio.com
 >
 >
 > On Sat, Aug 1, 2020 at 1:05 AM Roy Morgan <k1lky68 at gmail.com>
wrote:
 >
 > > It’s also possible now that I think about it, that the heater
you have
 > has
 > > gotten damp, and running it for a while would drive out moisture
that Is
 > > causing the leakage you detect.
 > >
 > > > On Aug 1, 2020, at 1:00 AM, Richard Knoppow
<1oldlens1 at ix.netcom.com>
 > > wrote:
 > > >
 > > > Is it possible the heating elements are the same, that is could
you
 > > put the good one in the 200Khz oven?
 > > >
 > > > On 7/31/2020 6:57 PM, Nick England wrote:
 > > >> I started to resurrect an XFK and before applying power
checked for
 > > >> possible leaky AC line bypass caps - Uh oh - measure about 50K
ohms
 > > from AC
 > > >> line to chassis.
 > >
 > > Roy Morgan
 > > K1LKY since 1958
 > > k1lky68 at gmail.com
 > >
 > >
 > >
 > >
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