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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: 449.27 VDC and 66.84 mVAC with 122 Line on 115 Tap posted by drlowmu on December 7, 2014 at 19:30:00:
In my quick try I used a higher winding resistance and got more like 50mV peak to peak; otherwise my simulation was pretty much the same.
The driver is fed from its plate choke, whose impedance at 120Hz is 113K ohms - that gives a lot of reduction. The ripple at the choke takeoff is half that of the full PSU, from capacitive splitting - more help. Not having built this, or simulated it, I can't be sure. But another cap at the high voltage end of the plate choke will kill the driver hum, if it's a problem.
I didn't show the calculation, but here it is: 1mVrms at the speaker is 2.8mV peak to peak, which at the primary is 50mV peak to peak. The filament will make about 2mVRMS at the 8-ohm tap, so this seems like a reasonable spec. Got to leave some room for the reality check once it's running! :^)
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Follow Ups
- RE: 449.27 VDC and 66.84 mVAC with 122 Line on 115 Tap - Paul Joppa 20:20:58 12/07/14 (0)
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