• 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.

heavy duty valve amps.... for PA use....?

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A

angel

Member
Joined 2003
No big loss. You would be dissipating something along the lines of 3kW/ch in heat while idling, and drawing several amperes from a supply of some 200V+ is nowhere near safe without some serious protection measures.

Would be interesting if someone ever did such a thing, though. :devilr:
 
B

Bunger Mulkin

Member
Joined 2004
The 1970's Ampeg SVT bass amp uses 6 output tubes (I don't recall what) and around 600-700v power supply for a solid, reliable 300w output. If you can find someone who really knows transformers, you could build on their design (parallel tubes for more power without HV supplies). The SVT is forced-air cooled, and barely portable. I bet you could get 600-800 watts before crossing the line between unwieldy and ridiculous.

On the other hand, you could try renting two of these from a big music rental place, and see if they do the job. A cheap experiment compared to building something this big.
 
T

thoriated

Member
Joined 2003
How about building a pair of bridgeable stereo 100W/ch amplifiers using 4 6550's or KT88's per amp? Then you can bridge the 4 ohm taps for 200W/amplifier. Reasonably good availability for all parts.


Btw, doesn't Hammond have a 280 Watt rated output transformer meant for three pair of beam pentodes? If so, you could order four & potentially reach your original stated goal using bridging in a single chassis!
 
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