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What you say is specifically true for receivers; it is obvious, no =
reason to try and see it as you suggest. But that is not true in the = general case (e.g. transceivers). Moreover, using a resistor, voltage will only drop only once tubes will = have warmed up and drain current. With a zener instead voltage will = immediately drop (e.g. any minimal load caused by an high-value resistor = anywhere in the circuit will be sufficient to have the zener dropping = voltage).=20 In some cases it is important to NEVER reach a voltage higher than = specified. I had a bad experience at that regard with 6146Ws fed by a = Collins power supply where the vacuum rectifier had been substituted by = a solid state one. Two new 6146Ws immediately flashed and were damaged. = A zener diode solved the problem. 73 Tony, I0JX=20 ***In the vast majority of receivers that I have come across,the power = supply loading is more or less constant,the main drain being by the = audio=20 output stage which is almost universally a class A amplifier.Hence = power=20 supply regulation is of no consequence as the load is static.Fitting a resistor will drop a = constant number of Volts,try it and see. =20 Brian Goldsmith.=20 =20 |
#2
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"Antonio Vernucci" wrote What you say is specifically true for receivers; it is obvious, no reason to try and see it as you suggest. But that is not true in the general case (e.g. transceivers). **** In the case of a transceiver using a vacuum tube rectifier I would expect the B+ to drop as the forward Voltage drop across the diodes increases with load. Brian Goldsmith. |
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