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
right.
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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