Does anyone have a circuit for this. It may be the same as model 56?

Autodyne (Screen Grid Radio) 80, 2A5, 57, 58, 57.

Thanks
Marc

There doesn't seem to be a match at

http://www.hws.org.au/RadioHistory/manufacturers/STC.htm.

Is it BC or DW, mantle or console?

This is a wooden table model BC only. Have photo's.

The white STC Label is still on it & clearly is Model 59. It has been tampered with & abandoned half way through the job, so I am going to have to check & trace everything to ensure that the floating wires have a home & everything else done, is correctly? .... assume nothing.

I am thinking it is similar to a 56 as several models had the same valve line up.

I now have the circuit for 56, but I did see the circuit for the others somewhere. HRSA may have info? I am a member.

Marc

Two articles on the 56 in Lankshear's Discovering Vintage Radio with helpful things like operating voltages. Can supply if needed.

I have seen the Lankshear articles; both are are consoles with a different transformer type & naturally layout.

There is a givaway on this one, in that it has a tatty green ARTS&P label on it. Lankshear mentions "white".

What leans me toward the 56 circuit is that there was not a lot of chopping & changing then as there were only a limited number of ways you could build an autodyne & it has similarities to EMMCO, who also had the same detector arrangement, with the RF choke in the what looks like a plate detector with a cathode resistor that high (shown in 56 circuit I was sent by Warren). The voltage divider resistor is virtually the same as the one in the photo. This one has a few modern 5 watt resistors, so again I need to see where & why they are there.

This is the joy of working on a half finished abandonded set, where none of the work on it is yours.

Marc

Further info: This59 chassis was 1935 and used (it appears) from my, confirmed by HRSA research and that of others; To have been used in set 596.

I have noted wiring errors and the big resistor having corrosion issues. What has happened is that an attempt has been started to replace the grid leak on the output valve with a volume pot.

An interesting idea but this by looking at the daisy chain of 5 watt resistors makes me suspicious that the resistance of the original volume control,in the big (25K) tapped resistors screen divider chain, was not known: not withstanding that the "daisy chain" might be a clue.

I may have to do some calculating based on Peter Lankshear's forsight in publishing voltages. But if anyone has one of those chasses, or info on the part number, we might be able to resolve that pot's resistive value?

Marc