[AMRadio] Power Supply Question

Donald Chester k4kyv at hotmail.com
Wed Dec 10 01:52:04 EST 2003



>From: "John Coleman" <wa5bxo at pctechref.com>

>If you're not having any trouble with blowing fuses of rectifiers you're
>probably OK with the large capacitor.

Of course, you will have less of a problem with the  large capacitor if you 
also use a filter choke with plenty of inductance.

BTW, I'm considering modifying the Gates BC transmitter to run CW by 
switching the filter cap and bleeder to the tube side of the mod reactor 
with a large ceramic DP switch.  In the cw mode, the mod reactor will act as 
an additional filter choke in series with the regular power supply one, 
while the cap effectively shorts out the secondary of the mod transformer.  
The increased inductance will maintain critical inductance under key-up 
condx when there is little or no load on the plate supply.

Don K4KYV

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