Tube Audio Amp question

try using 833 tubes. they are about 500 W each and the plates glow orange in normal operation.

On Fri, 03 Nov 2006 05:24:31 -0600, maradcliff Has Frothed:

You'd want to switch tubes to maybe a higher power pentode like a 6146. There was someone experimenting with a 6 tube 1500 watt amp but I don't remember what tubes he used just that the filiment current was around 10 amps.

Just run all your pairs in parallel. You can get them to current share well enough with some uncoupled cathode resistance.

There are higher power tubes of course. 6L6=KT66, which iirc have a bigger brother in KT88. Then there are serious power tubes.

Its quite possible to make your own. In fact if you're prepared to use a bell jar and pump, its quite easy. Those valves could be funky as well as groovy. Not many amps have to pump down to operate. Using bulb filaments for emitters will make it very visual.

NT

Why so much power? Sounds like overkill to me. Build 50w monoblocks and use a set of effecient horn type speakers (Klipsch or the like). That'll be plenty loud. If you want to run a bazillion pairs of output tubes in parallel....good luck finding an output transformer to match the total plate impedance.

You hand wind one using the motor lams from an old 1 HP motor, and bus bar copper hand insulated with cloth tape.

...during the peak of a lunar eclipse.

Sure.

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I guess I missed this part reading too fast. If that's all you want to do...use dynamite. It'll be cheaper, more efficient, and a real

Your post smacks of troll, but in the event you're serious, there's always these:

Schematic:

Looks like the motor controller for a streetcar!

Trix used to make a cinema amplifier in the 50's. A pair of 813's with nearly a Kv on the plate. If I recall they produced about 600 watts into 100 volt line. The output trany was a toroid about 9 or 10 inches in diameter, potted in a cast alloy case.

Use a pair of 4CX1500 (or larger) tubes. ;-)

Heh....yea. Transmitting tubes. I was gonna say a pair of 250TH.

Not that any of this is a repair issue, but if you're going to use those, you might as well go for watercooled tubes. Get rid of that fan noise, and why not be out of the ordinary.

Michael

Real men use 200 amp SCRs.

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Homer J Simpson spake thus:

Water-cooled?

Mercury!

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A higher power tube does seem to make more sense than combining 36 smaller ones. But unless I'm mistaken, the 6146 is rated for 25 watt plate dissipation, the same as the 6L6.

On Sat, 04 Nov 2006 19:03:16 -0800, Blake Has Frothed:

Must have read the tube data wrong or the data I was reading was a typo.

Some else suggested using an 813. I can't recall the site but someone built a 1kw audio amp using them. This guy was a bit on eccentric side if I recall correctly.