I don't have it here to send you a photo, it's at my son's house. It has a DIN with 8 or 9 little sockets, some are input, some are output, some may be for power. Here's a pic from the web...
View attachment 1119313
As for tracing the circuits, here's the amp itself...
View attachment 1119314
Internally, it's a power supply, and dual-mono power modules (output I think is 80W). To fit all that into that 4" cylinder means every part of it is totally unlike any circuitry I've ever seen, and tightly crammed into a very small space. I look at it and my eyes go blurry. I'm sure someone smarter than I could do what you suggest.
But I don't even know if it works. When I got it there was tinfoil stuffed into the fuse sockets. I put real fuses in, and they blew. Then I did something (I don't remember what, it was years ago) and I could turn it on
without blowing the fuses. The first sign of life! Will it produce sound? I don't know, and can't know without that cable.
I found a site in UK offering £80 for the cylinder. I contacted them and got no reply. I contacted them again about the cable, and again no reply.
The cables sometimes appear on Ebay.UK and go for £50, but they only connect to the matching preamp, which I don't have. So I'd have to figure out
two bizarre connectors so I can connect to a normal preamp. The matching Lecson preamp is also unique...
View attachment 1119317
Both units are on offer for £1,400 on Ebay.UK. Here's the description —
For sale, my beloved Lecson AC1 preamplifier and matching AP3 power amplifier. I'm sure that if you are looking at this listing then you know what you are looking at. I am reliably informed, by Meridian Audio that there are approximately 30 of these units left in the world in working order. One is in MOMA in New York. One is in the V&A. One is in my Dining Room!
I bought these units in 2013 and immediately had them serviced by an engineer at Meridian Audio who used to hand build them for Lesson in the late 60s/early 70s. I have a transcript of his service notifications and works carried out. So in full working order. He had previously seen the preamplifier in 2003 when he converted one of the DIN inputs to accept a more normal, modern day CD player at 2mV.
I'd love to have the set but I don't. I'd love to use the amplifier I do have. The fact it's in two of the world's most prestigious museums is a real incentive. But not even knowing it it works, or how to find out, or if it's worth the effort, is a disincentive for me.
Any ideas? Anyone?