[TMC] PAL-350 / PSP-350 High Voltage Transformer

[Meir WF2U]

Luckily, this hasn't happened so far in either of my 2 PSP-350's.
I hope you find something, if not original, but at least a substitute transformer fitting in there.

I have a problem with the HV circuit breaker in my no letter suffix PSP-350 with solid-state plug-in direct 866/3B28 substitutes (the other one is a factory solid-state, late -A model). It started to shut down initially as soon as the plate current reached about 250 ma, (the trip set pot is all the way to maximum current), then it crept down, now it shuts down just as the plate current goes a hair above the idle current, and from going to receive when releasing the PTT. Everything else is OK, including the 4CX350's. I also tried to plug in 3B28's and 866's, as well as a pair of fresh SS plug-in rectifiers, with no difference. I shorted the breaker and measured the actual current through the internal electromagnetic trip coil  (rated 100 ma trip), and it wasn't anywhere near the trip current. These electromagnetic trip circuit breakers are not available any more. I may have to design an optocoupler or Hall Effect trip circuit activating a contactor to open.
Has anyone experienced this type of HV circuit breaker failure which looks like mechanical?

73, Meir WF2U
SC

⁣Sent from BlueMail ​

On Nov 28, 2018, 9:31 AM, at 9:31 AM, Steve Rohrer <ka4rsz at gmail.com> wrote:
>Greetings all,
>
>The high voltage transformer in the PSP-350 here has developed a short
>in
>the secondary winding.  Interested in hearing if anyone has dealt with
>this
>problem, and possible sources for replacement, repair, or substitution
>of
>this transformer, TMC part number TF-189 (4800 vct @ 220 ma).
>
> 
>
>Thanks!
>
>  Steve - KA4RSZ
>
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