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A comment on Low THD PWM audio amp, DIY friendly. Parent comment

Re:Low THD PWM audio amp, DIY friendly by michaelteter on Sunday January 15, 2023 @01:01AM (#34387113)
Crutchfield? https://en.wikipedia.org/wiki/Crutchfield_Corporation
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Re:Low THD PWM audio amp, DIY friendly by pengaru on Sunday January 15, 2023 @02:08PM (#34392099)
They seem too focused on automotive/car stereos to be it.

The catalog I'm recalling was cover to cover populated amplifier circuit boards accompanied by specs and prices. Lots of huge toroidal transformers... maybe it was a local thing back in IL.

The cover was mostly black with glowy green text IIRC, nothing like the vintage Crutchfield catalogs I can find via GIS/ebay. Oh well.

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Re:Low THD PWM audio amp, DIY friendly by snozolli on Sunday January 15, 2023 @03:50PM (#34393213)
Possibly Madisound. Their site says they've been around since '72. I have vague recollections of them having a print catalog in the 90s before everything went online.
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Re:Low THD PWM audio amp, DIY friendly by pengaru on Sunday January 15, 2023 @06:45PM (#34394937)
It might have been an 80s refresh hifi-leaning variant of eico's catalog:

https://www.ebay.com/itm/255457806571

That cover seems very familiar to me, and I do remember there being a bunch of green on a black background.

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