Introduction

[David Roy]

Hello and glad I found this site.

I've been looking to take on a radio project and this and sure enough someone dumped this 800B so I brought it home. Looks very clean inside but chrome has seen better days. Perfect for me because I like to work on stuff and prefer not screwing up a gem. Everything turns freely.

I have another Leslie/Hammond organ project I've been working on and this Scott looks way more complicated. I looked at the schematic and it's pretty busy. To top it off I don't have the power supply or speakers. This might be too much for me and I wish it was more self contained or possible to rig up my own power supply for tinkering. Is it possible to incorporate a different power supply and power amp? Looks like the power supply is dedicated to part of the FM circuitry so may be hard to do.

Would like to talk and eventually get it working. Thanks.

Anyway here is what I found and not sure where to go now but receiver looks complete.

 

[Norman S Braithwaite]

David:

Welcome!  If you want to restore this chassis as an educational exercise, go for it.  Yes, you can build a power supply for the tuner but it will be complicated by the needs for a control supply (relays and tuning motor) and the entire FM IF strip.  AM and shortwave reception can be accomplished without either but you will have to hard wire or jigger the relays including the power relay.  If you want the set to operate using pushbuttons and motor tuning, you will need to address corrosion at several locations as well as including a control voltage source in the power supply.  There were 10,000 Scott 800B chassis constructed and others in better condition will turn up for reasonable prices (recent sales have occurred in the range of $50.00 to $300.00 in spite of the perpetual eBay listings over $1k).  My guess is that you will spend as much for parts to build a suitable power supply without the FM IF than it would cost to purchase a stray power supply chassis.  Should you decide to restore this tuner chassis or pursue restoration of a chassis set in better condition, I have many parts and a small number of complete chassis available but sadly no extra original speakers.

Norman

[David Roy]

Thanks Norman. Yes at this point it's just educational until I find (if I find) the proper power supply.

I've been looking at the schematic tonight and think I understand it and your right about the AM tuner not requiring IF circuitry from the power supply and I think I'll get the AM function working until I get the proper power supply. Looks like I can power the start-up relays with a separate transformer, supply B+, B+ regulated, grid and ignore 12 all through J3. I guess the AM signal comes out of J4 pins 3,4. My Leslie power amp project is similar to this as it supplies B+ and you return it the signal for amplification so I may use that schematic as a start.

Seems like the tuner acts as only an on/off switch for 110 so I can keep that in the power amp. I will probably need help with matching the output signal of the tuner's 6J5 with the input of my power amp and find a transformer rated to handle the quantity of tubes this tuner has.