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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: RE: How reliable have your SET or SE tube amps been? posted by johnnycamp5 on April 18, 2016 at 18:55:57:
Tube rectifiers have a minimum plate supply resistance (Rs) for a given voltage. The 5U4G at say 450~500V (as is typical for cathode biased 300B amps) needs to see about 70 to 80 Ohms ahead of it. That is the combined resistance of the transformer's primary and secondary given by the formula: Rs = Rsec + (N^2)xRpri + Ra. It's this this last term, the additional resistance, that must be added in order to bring the Rs to the desired value.
Depending on size, a typical transformer in an amp such as yours will have a source resistance of about 30 to 40 Ohms. You would probably need to add a ~30 Ohm resistor just before each plate of the rectifier (total of 2 resistors) to bring the source resistance (Ra in the equation above) to the required level as specified in the tube data sheets. I would use at least a 10W resistor.
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Follow Ups
- RE: How reliable have your SET or SE tube amps been? - sonicboom 09:20:10 04/19/16 (2)
- RE: How reliable have your SET or SE tube amps been? - sonicboom 10:07:49 04/19/16 (1)
- RE: How reliable have your SET or SE tube amps been? - johnnycamp5 12:39:10 04/19/16 (0)
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