Axiom Home Page Forums General Discussion Stereo Want to Try Super Tube Sound for $20?

Hi samandnoah

Watts = Amps * Volts.

15 watts per channel = 30 watts = X * 14 volts
30W/14V = 2.1 Amps.

So, a 3 amp 14 volt power supply will give you a bit extra. Anything more would be unnecessary.

Rich, as 2x6 correctly demonstrated, that power supply would be more than adequate. Although manufacturers sometimes indulge in "high current" hype, the amount of current needed in a specific situation is no more than required by God and Dr. Ohm.

Very interesting indeed...especially at only 20 bucks. And here is what 500 bucks can do with the same little amp!

http://www.redwineaudio.com

http://www.redwineaudio.com

Do you think the Tamp can handle 12V 7.5Amps? Since I have a ton of Computer power supplies and one of the rails is 12V 7.5A 200W, i was thinking i could use that to feed into the TAmp. But I am not sure if it can handle it. Does anyone know? THanks.

It's the volts - 12 volts are fine for the T Amp. It doesn't make any difference how many amps are available so long as you provide at least 2.1 amps. If you go over 14 volts you'll fry the T Amp's chip. I would use an independent power supply.

If the T Amp ever drew 7 amps, you'd have a lot of melted, undifferentiated metal, plastic, insulation, bad gasses, and probably a fire.

In reply to:

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Do you think the Tamp can handle 12V 7.5Amps? Since I have a ton of Computer power supplies and one of the rails is 12V 7.5A 200W, i was thinking i could use that to feed into the TAmp. But I am not sure if it can handle it. Does anyone know? THanks.

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Just remember that you need a pretty substantial load for an AT/ATX PS to regulate itself (I found out the hard way building my arcade cabinet - used a spare AT PS to power the coin return lights and fans... even now if one of the #45 lamps in the coin returns burns out, it goes below the minimum load and starts doing funky things with the output voltage)

A good starting point is 10% of rated maximum, so you may find you have to "burn off" a bulb or something to reach your minimum load.

Bren R.

So that is a negative on using a ATX power supply for the TAmp? TAmps are so hard to come by nowadays that I am not ready to fry one just yet.

I really don't know whether or not the load would be enough to regulate voltage (and each PS is different... I tried two before I found a whopping 150W AT that would be stable with two fans (80mm and 60m) and two #45 lamps attached. ATX may be different (just remember to "hold low" the POWER GOOD line on the wiring harness or it won't fire up!) but if the T-Amp isn't tolerant of higher than expected voltage, I wouldn't try it.

My opinion. YOMV.

Bren R.

OH MY GOSH!!!! WHAT HAPPENED TO YOUR FACE BREN!!

take it away, its freakin me out!!

thats scary..

bigjohn