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ampage archive
Vintage threads from the first ten years
Variable wattage amps
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 6/21/1999 4:42 PM |
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| Matt | Variable wattage amps Has anyone checked out Kevin O'Connors variable output wattage amps on the London Power web site? What a totally cool idea! How does he do it?? It sounds like a good idea for extended tube life and hearing loss. |
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| 6/21/1999 6:00 PM |
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Doc |
Those amps have separate power supplies (separate transformers) for the heaters, the power amp B+, and the preamp B+. While keeping the heaters lit at their normal 6.3v level, the anode operating voltages can be varied thus changing tonality and power output. |
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| 6/21/1999 7:06 PM |
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| Matt | That would mean the bias supply(ies) would have to change as well (I remember seeing a cathode/fixed switch). So that power (wattage) pot must be a huge guanged wirewound device or something. Maybe it's a lot more complicated than that? |
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| 6/21/1999 7:44 PM |
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| Doc |
He's got some newer high powered variable versions available, but I was referring to the lower power ones that use cathode bias in the output stage. |
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| 6/22/1999 11:41 AM |
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| John K. | Yes, I have checked that site out, and I wondered the same thing as you. Nothing on the Harmony Central review data base. I e-mailed them and tried to find out if I could try the 50 watt version out somehow. No response so far. Anyone know how these amps sound? |
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