• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

what about tubes?

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You would have to use some monster transmitting triodes in push pull, with voltages of 2000V plus at 10s of amps, the amp would be massive, require forced cooling and consume insane amounts of electricity. You would also need extremely expensive custom wound output transformers if you went for that amount of wattage.

That said you could have a look at: http://www.geocities.com/TimesSquare/1965/pp3cx300.html

for a laugh :)

Seriously, don't do it, the voltages are too high and you cuold kill yourself very easily...
To put things in perspective, Western Electric used a push pull pair of 279As (these things consume 210W each in the filament alone) in class B2 (essentially the most efficient class of operation) to get a mere 2,200W output.

Oh, and a 3,000V HT. :hot:

Please don't build something like that, it will not only likely make you very poor, but can easily make you very dead too.
Kent Smith said:
A funny and entertaining thread. It does show how the current toward high power can get ridiculous. Back in "Ye Olde Days", you could drive Altec A7's pretty loud with as little as a 3 watt amp. Maybe there's a lesson here?.....

im not looking for a 3 watt amp, i need it to power 300w speakers, and i thought it'd be nice to build my own tube. but thanks for reading!


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Charles Darwin knew finches, not tubes

You don't have to receive the Darwin Award posthumously.


Of course in some American States, the "teaching" of creationism may preclude the introduction of Charles Darwin's Theory of Evolution.

Off Topic: One of my favorite interludes on a bicycle tour of Nova Scotia, was to stop at a Canadian site for world shortwave broadcasting. Inside there was the remains of an RCA booth, like a museum piece, with the biggest tubes I have ever seen! I wonder what amount of power was going through that baby! The door to the room was amazing with art deco style and the little porthole window was in blue glass with the RCA logo etched in white. For security reasons, the guard did not allow me to take a photo. :bawling:
Actually, there is a difference.... no change in Watt definition, just in how the amp behaves when overdriven. Transistor amp clips hard and sounds really bad. Tube amp will increase harmonics while putting out more power.... until transformer saturates. You may find 100 watt tube amp just as good as 200 or 300 watt transistor amp, plus more dynamic and sweet sounding.
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