I am building a SET amp using the VT-25 and I was wondering if VT-25A can be used interchangeably?
Thanks,
Min
battradio wrote:The Plates are larger on the 25A's , and the VT 25 filament is much brighter if I remember correctly .
SDS-PAGE wrote:I have a couple of questions on this schematic:
1) I see that the heater voltage is 7.5 volts for the VT-25. Per the SUn Audio VT-25 schematic above, would the rectified 6.3 volts followed by 1000mfd/10vdc supply 7.5 volts for the heater?
2) Am I correct to assume that the primary impedance for the VT-25 is 10K?
kheper wrote:6.3V through a FWB yields more than 7.5V. You may need to chop it with a resistor, but the loading and the hum pot could take 1.3V off.
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