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Hello - Is it possibile to construct a valve amp that has 100w,200w or 300w of power ?what are the limiting factors if this cannot be done ?. I would appreciate whatever details any could give me. I apoligise if this is a ridiculous question , I am new to this , but I am wanting to learn.
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I once owned a Melos stereo amp rated at 200 watts triode with a push/pull pair of tubes that actually put out about 280 watts. The early mono-block versions of the amp put out over 700 watts triode with just 4 tubes, later reduced for added reliability.
There are numerous 300 watt + tube amps on the market. The VTL Wotan has over a kilowatt. Or merely 600 watts triode. It is a treat to hear.
rw
Standard response around here is "did you swap the tubes?". Ugh!
Which I was asked to do for that particular pair around the time I took the pics. Set all forty-eight 6550s to ~ 290 mv. At least my little brother amps to those only have sixteen! :)rw
But hey, that amp looks awesome and I bet the sound is something to behold. But it sounds like more trouble than I am willing to go to (even if I had the money). I think you have to be pretty dedicated to the perfect sound. Thank heavens that new production output tubes are good, it has to be exhorbitant to retube as is, if you had a tast for NOS I can't even fathom.
so at least you remove that hassle. Anyone spending $30k on amps probably doesn't worry terribly much about practicality!rw
Look at all that Nordost cable! Nice!
featured a high power tube amp with *lots* of features. Also, this same magazine had an article last year, I think, of a back full of HK Citation II's wired together for about 450 wpc.Seems like the biggest issue with such amps is the heat generation.
Cheers,
David
The December 2005 issue featured space shuttle astronaut/engineering professor/audio designer (and friend) Norm Thagard's setup of (8) Cit II amps driven by his own design "phase splitter". That gives him 480 watts/channel RMS, and about 1000 watts/channel peak power.Norm tells me it's simply amazing. He told me the first reaction people have to hearing it is to laugh ! The sound is so remarkable that at first people are simply unable to process it it seems. I'll be visiting him one of these days so I can hear it for myself, what a trip!!
see links
It is certainly possible, in fact there's a '50s paper on a 3000W valve amp on my web page (though it's definitely not hi-fi).All it takes is money... valve watts cost a bit more than solid state ones. Four 6146, KT88 or 6550 output tubes can deliver 100-200 watts, depending on operating point and driver circuitry. Hammond has a 280 Watt output transformer in their catalog - with 6 6650s, 200-250 watts would be relatively straightforward. And relatively expensive...
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