Is it Good to regulate supplies?

[TonyTecson]

Alls I know is there is utterly no hum in the quad 6L6 amp I built which uses +480V plate and screen voltage. Embarassingly simple power supply that would make the hard-core power supply junkies here collapse in shock but screw 'em, it sounds good and works even better. Between idle (40mA per tube = 160mA total) and full signal (um...haven't measured max. current) it drops from 480 to 450V. While delivering 80W into 5 ohms (on the 8 ohm tap.. go figure).

hi,

interesting, you must be using a big power traffo with low dcr windings, can you give us an idea? size and weight would be fine.. the kind that turner audio uses in their power amps?

thanks,
tony

 

[Sch3mat1c]

No, looks like it came from an organ or something. Measures 3 3/4 by 4 inches square footprint, as mounted. Chassis is 12x16x3" FWIW.

In operation (powering um 480 * (4*.04) = about 80 or 90W plate, plus 30W of heaters) it gets a little warm, I forget if it barely passes the 10 second test or not. And mind you I have asbestos fingers with high pain tolerance so that may not be very valid to you. 😉 Especially now that summer is coming it'll probably struggle past the 5 second test after being on a few hours...

Tim