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100W Ultimate Fidelity Amplifier
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Old Yesterday, 11:12 AM   #13331
corvo72 is offline corvo72  Italy
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only +/- 10 V different?
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Old Yesterday, 12:01 PM   #13332
bullittstang is offline bullittstang  United States
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100W Ultimate Fidelity Amplifier
Depends on your speaker impedance (load)
+/-65 for 8-ohm and I wouldnít use at 4-ohms often or at high volume.

For 4-ohm stability and 2-ohm dips I would suggest +/-55Vdc.

You can use higher voltages, but will decrease SOA and dependability. I usually push the limits, but I also donít mind rebuilding an amp if it blows up.
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Old Yesterday, 12:11 PM   #13333
corvo72 is offline corvo72  Italy
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Ok, I well noted! I normally use 8 ohm audio towers (independently speakers box connected to passive crossover). thank you bullittstang for your explanation!
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Old Yesterday, 12:16 PM   #13334
bullittstang is offline bullittstang  United States
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If you use the transistors specíd (didnít look them up prior) you should be safe with +/-65Vdc, they are 250V 200W parts.
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Old Yesterday, 01:00 PM   #13335
corvo72 is offline corvo72  Italy
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using as an example, originaly BX22 with 2 pair of power transistors 2SC5200 & 2SA1943 as per sheme attached, if I decrease the power supply to 65V, the 10 ohm resistors in series to the supply of primary stage, must decrease theire value?
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Old Yesterday, 01:15 PM   #13336
bullittstang is offline bullittstang  United States
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Not 100% sure - maybe someone else will chime in to confirm, but I wouldnít think it does.
I would not use +/-65 with those BJTs, you would need to step up to their big brother version.
MJL3281/1302 or MJL4281/4302 the bigger brother
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