[AMRadio] Too much HV

[Bernie Doran]

if you have too much voltage it is not because of the 866 replacement! they 
only drop about 15 volts, you should know that.  If you now have 2500 
instead of 1500, you either removed the choke or it is shorted, turning the 
filter into capacitor input instead of choke input.     You did not install 
the diodes as a bridge, did you? Bernie
----- Original Message ----- 
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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