[AMRadio] too much HV Fin.

[Bob Gunther]

Why check it out.....lol,  just replace the 811's with 572's and you'll get a little more power !!! (only kidding)
Bob KG4OJZ (ex K1SUI)
 

> Date: Wed, 19 Oct 2011 06:52:37 -0700
> From: mjcal77 at yahoo.com
> To: amradio at mailman.qth.net
> Subject: Re: [AMRadio] too much HV Fin.
> 
> 08:57 PM 10/18/2011, you wrote:
> >I think the silly part comes fundamentally from blaming the HV
> >increase on the SS diodes.
> 
> Well, as I said, always have found this to be true and realize that the lower voltage drop across silicon diodes versus a HV rectifier is the reason, but the theory of how much it should change never seemed to work out. In the winding down tube era, every mod kit I put in a commercial tube receiver came with a resistor in the 560ohm 10 watt range, current draw dependent of course, to offset this higher voltage. In the HA10, the real culprit that I overlooked is the missing swinging choke, so all I have is a cap input filter where the cap is charging towards the peak of the DC from the rectifier while under the bleeder resistor and 811 idle current draw which apparently is not enough to limit the HV to something more comfortable for standby 811's. In Bill's case, as noted, he just may have a shorted choke. We'll check that out.
> 
> Charlie in NC
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