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In Reply to: RE: RAPHAELITE Sinovt 2A3-845 MonoBlock acting up posted by Paul Joppa on April 12, 2016 at 20:20:08
Hi Paul, on the 2a3 I measured 45vdc more or less, on 3 pins of the tube. Is this normal bias voltage, more or less. I have no experience with 2a3s so any advice is welcome. regards, Dak
Follow Ups:
The 2A3 bias voltage is 45 volts at the most standard operating point - see the link for a typical data sheet.
What is called the filament voltage is applied across the filament, measured with one meter probe on pin 1 and the other on pin 4. Really, there is no such thing as a voltage; there are only voltage differences. Usually but nowhere near always, one of the probes is on the ground - but even then, sometimes you also need to choose between signal ground, power supply ground, and safety ground.
OK, thank you for the info. The fact that I measured +45 vdc is not a problem? Also I could not find the cathode resistor. On this amp they also take the heater wires to the interstage tranny. What is the purpose of that? thanx again, Dak
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