Author Topic: Wrong wattage calculation on a review of an audio amp.  (Read 3343 times)

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Offline BrianHGTopic starter

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Re: Wrong wattage calculation on a review of an audio amp.
« Reply #50 on: January 04, 2025, 02:29:55 am »
I remember years ago, like 35 years ago I made my own amp using OP27s powered to the max at +/-22v, driving matched pair darlington emitter follower stage.  The amp having a balanced output, heavily biased for the heat and warm sound, gave me a clean 40v p-p output.  (The transistors collectors had an unregulated extra ~5v headroom and the base drive bias had a charged bootstrapped cap2 allowing the bases to operate above and below the op-amp's output maintaining that class AB drive up to the limits of the opamp's output.)

This means that that amp delivered me just about 100 watts into 8 ohm.  I guess this wasn't too bad for a first design amp using just 2 opamps per channel with a few driver transistors and resistors + a few caps.

I believe the transistors were MJ11028 and MJ11029.  50 amps, 60v, or MJ11032, MJ11033.  50 amps, 120v in TO-3.
« Last Edit: January 04, 2025, 02:42:30 am by BrianHG »
 


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