Re: [Amps] Tube substitute in a Hallicrafters HT-41

["John Finner" <finnerjf@worldnet.att.net>]

Going in a different direction, a pair of 4X150A/4CX25B's in 50 ohm passive 
grid AB1.  Tubes are cheap and plentiful.  Anode load impedance, anode supply 
voltage, filament voltage and bias voltage supply need little or no change.  A 
zenior screen regulator off of the anode supply and cooling air need to be 
dealt with.  Looks like plenty of room for the sockets.

Since the HT-41 has no tuned input, a 572 conversion would be more complex.

John
WA4EPI

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