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Message started by 4krow on 09/14/17 at 17:56:27

Title: Superphon Project
Post by 4krow on 09/14/17 at 17:56:27

As luck would have it, I got my hands on a pre-amp that I sold about 35 years ago from a friend. It has actually survived a house fire, but due to some heat issues, I decided to gut it and start anew. Painting the chassis was simple enough, but I skipped the faceplate and rear panel, which I will decide on what I might do in the end. I will be adding new circuitry in the form of a buffer amp, using with it a set of mono volume controls. I have done this before with great results. We will see where this leads.

Title: Re: Superphon Project
Post by Lonely Raven on 09/14/17 at 19:53:09

I'm not familiar with it, but that does sound like a neat history.

Title: Re: Superphon Project
Post by 4krow on 09/14/17 at 20:20:29

LR,

Superphon may have been the predecessor to PS Audio. Stan Warren, and that other guy, um what's his name 0), Paul something. Anyway, they worked together a number of years. These units had a separate chassis for the transformer, and I discovered that the DC portion of the power supply ran at 24 volts. It *was* quite robust. There was too much trouble to deal with it all, and after looking over the circuit boards, I decided that they weren't the best there was to begin with.

Title: Re: Superphon Project
Post by 4krow on 09/16/17 at 02:58:44

Evenin' Folks,

A good start for sizing, drilling a bunch of new holes and some layout. Got a long way to go.

Title: Re: Superphon Project
Post by 4krow on 09/16/17 at 03:00:05

One more.

Title: Re: Superphon Project
Post by 4krow on 10/21/17 at 02:14:05

Just about there. Installed the tube buffer and a different sort of animal. An AR TDS202 module. Basically, it is a set of output transformers and a couple of filters designed to be a sort of loudness circuit. I found a small black enclosure to mount it in, and will be doing some listening soon.

Title: Re: Superphon Project
Post by 4krow on 01/29/18 at 22:51:52

Just one more shot for the project. I have to work out a bit of hum concerning the TDS module inside the chassis. Other than that, it has risen once again. Notice the Raleigh Emblem on the top plate. It came from my very first decent ride. That's about all that is left of it!