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Re: [Amps] FW: Transformer Question

To: Matt <>,
Subject: Re: [Amps] FW: Transformer Question
From: Colin Lamb <>
Reply-to: Colin Lamb <>
Date: Thu, 27 Feb 2020 08:09:29 -0800 (GMT-08:00)
List-post: <>
The GSB-201 has the choke on the - side of the transformer, rather than the 
positive side.  This is the same either way.  The negative side has less 
voltage to ground.  The voltage says 1500 volts, which is after the choke.  
With the choke in series with the supply it will have about 100 volts less than 
the actual transformer voltage which is about 1600 volts.  

New supplies do not use the choke.  They use more capacitance instead (which 
the Ameritron does.   However, this is a capacitor input power supply rather 
than a choke input power supply, and the voltage ends up 1.414 time the 
transformer high voltage.  The higher voltage will be handled by the tubes, but 
the variable capacitors may not handle it.  Also, the higher voltage will also 
mean the taps on the output transformer will need to change for the Q to be 

To end up with 1500 dc voltage, you would need a transformer that reads about 
1060 volts, if you use capacitor input.  If you use the choke you would need 
about 1600 volts.

Colin  K7FM
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