Figure I'll try again and see if anyone has info on these old head amps, especially those made by Single Power Audio. I've worked my way through a couple of the other units, but have found nothing technical on this brand. Thanks!

Thanks! If I don't get a response here I will try the DIY thread.

I posted much of this in my introduction, but it seems perhaps a specific post is better. I have been asked to help restore, if possible, a number of head amps. They belonged to a past Head-fi forum member who passed away in January. Sadly, his widow doesn't know what his forum name was...

Hi everyone! I'm Hank, I have been lurking here for a while, but have been an audiophile (in the best sense) for nearly 60 years. I am quite comfortable in the world of big vintage gear, owning a number of tube amps from McIntosh, Fisher, Scott, Eico and Pilot; which drive a number of equally...