It was over 10 years ago, and I built 3 matching ones to drive my active Isobariks.
Roughly, the costs would be in the following ballpark I think:
Torroidal xfmr: £50 Main reservoir electrolytics : £30 Case: £50 Output devices: 8 x £10? Other parts: nominal
Estimate say £250 each.
I once posted some photos of them, let's see...
Interesting. I've sometimes dreamed of making a power amp for the hell of it (I have pre-outs) but will probably never get round to building one.
Maplin used to do an excellent 150 watt mosfet amp for not a lot. Just add power supply. I've got a pair in the workshop driving home made speakers which still delight.
I must have built about 50 of those, many of them with paralled output stages for stage use. Cracking good design, decent performance, even for hi-fi and unburstable.
Maplin used to do several in house kits which were very good. Was told they discontinued them because of needing CE marking or whatever. Or perhaps they preferred to just sell mobile phone cases...
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