[AMRadio] Too much HV

[Mark Foltarz]

I don't think the SS diodes are causing  an increase of 1000 V !
Something else definitely changed.
Was there a change to a tap on the transformer ?
Were the filter caps changed to something large and the  chokes eliminated ?
SS diodes are usually a good thing. I like 3B28s myself but I use a couple of  Silicon Alley diodes in the PS for my TBW xmtr.
Tell us more about the circumstances.


73

de KA4JVY

Mark




>________________________________
>From: CL in NC <mjcal77 at yahoo.com>
>To: AM radio <amradio at mailman.qth.net>
>Sent: Tuesday, October 18, 2011 10:47 AM
>Subject: [AMRadio] Too much HV
>
>Other than using a variac or a boost buck xfmr, does anybody have a solid cure for the problem of excessive high voltage when 866's are removed and replaced with a solid state diode string?  I do not remember having this problem when I replaced 866's or 3B28's with the commercially made  direct plug in equivalent SS replacements, but only when modifying ham gear.  Bill, W4TYQ in Asheville, NC and myself are both working over a couple HA10 amps, and having to deal with 2500VDC on the plates of 4 811's instead of 1500 or so.  Both our amps came with the 866's already replaced, and we are toying with the idea of just putting 866's back in.
>
>Thanks for any help.
>
>Charlie W4MEC in NC
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