[AMPS] ? Voltage Doublers as Anode Supplies

[zeitler@ibm.net]

-----Original Message-----
From: km1h@juno.com <km1h@juno.com>
To: measures@vc.net <measures@vc.net>; amps@contesting.com
<amps@contesting.com>
Date: Tuesday, September 01, 1998 8:07 AM
Subject: Re: [AMPS] ? Voltage Doublers as Anode Supplies


>
>Rich's response is right on the mark.
>
>It might also help to mention that beside Heath;  Drake, National,
>Kenwood, Hunter, Collins, Dentron, B&W, and Yaesu and probably several
>others used doubler supplies to good advantage. They also work just fine
>on RTTY when derated accordingly.
>The inherently low resistance of the xfmr,

......is very important. My L-4B stock primary power xmfr has a sec. R value
of around 15 ohms. The no load to full load E drop is only 300 volts fully
loaded for max power out, around 1250 watts on 40 meters with 90 watts of
drive. E doublers work and time proven. QRO and Command Technologies I
believe are both using doublers.

I HIGHLY recommend Digi_key as a great source for quality electrolytic caps
for the filter bank. I recently pickled up some 560uF 400 volt caps that are
incredibly small for around $10.00 per cap or so. These days we are able to
get a lot of cap for the size.

OTOH my old Heathkit Warrior that uses a choke input has OUTSTANIDNG E reg.
It will work only on 120 volt mains (using stock plate xmfr) and fully
loaded the Ep only drops around 175 volts. Currently it is configured to run
(4) 572Bs and will provide around 900 watts out with 90 watts of drive. The
unloaded Ep is only 1650vdc. This shows how good the orig. ps design is.

My two cents worth.

Lane
KM3G
Very HOT San Diego

>coupled with sufficient C in
>the filter allows full load to no load regulation in the order of 10-15%
>and significantly better on SSB.
>
>I would also suggest to obtain a Dahl catalog and check out the CCS
>ratings of his wide selection of replacement xfmrs for the above
>mentioned brands.
>
>73  Carl  KM1H
>Amplifier repairs and 6M Conversions our speciality
>
>
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