[TMC] XFK - AC leakage to chassis

[Richard Knoppow]

    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. Disconnect the bypass caps and no change. Disconnect the
> power transformer and no change. Eventually I found that the heating
> elements in the 200kc oscillator oven were the culprit.
> Well, in a device with an ungrounded two wire AC cord, that sure sounds
> nasty to me.
>
> I pulled out the heating elements which look like a ceramic tube within a
> metal jacket that fits into the oven. Yep, 50K from line to that metal
> jacket .
>
> The other oven for crystals measures OK. Of course....because I'm never
> going to use a crystal that one is fine!
>
> Surely this isn't normal? Has anyone come across this in a TMC oven before?
> Am I missing some layer of insulation between the heater jacket and the
> metal of the oven?
>
> Cheers,
> Nick England K4NYW
> www.navy-radio.com
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL