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 STC Console 536A Info
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 Return to top of page · Post #: 1 · Written at 7:07:34 PM on 5 July 2019.
Beakr's Gravatar
 Location: Bunbury, WA
 Member since 3 July 2019
 Member #: 2357
 Postcount: 2

Hi all!, new to the forum.
I have had the STC console sitting in our entry for a few months as a part of a bulk radio buy up and hoping to get into radio repair a bit more. Was hoping someone has extra details about this unit, year of build, schematics etc as having trouble locating anything. It was working then stopped working according to the previous owner. Valve line up is 6J8G 6U7G 6B8G 25L6G 25Z6G 302. An info label has it as an AC/DC unit, has no mains transformer and the barretter mounted near the base of the cabinet has damaged filaments. Any opinion about getting this one fixed up as it's an AC/DC unit, parts harder to come by?, more troublesome? Any feedback would be appreciated. I can email photos to the admin. Cheers, Chris.

STC 536A Valve Radio
STC 536A Valve Radio
STC 536A Valve Radio
STC 536A Valve Radio


 
 Return to top of page · Post #: 2 · Written at 8:56:31 PM on 5 July 2019.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 802

Welcome to the forum.

There is a 536UY in this list, but no valve lineup:
http://www.hws.org.au/RadioHistory/manufacturers/STC.htm

Some 536s here, but not yours unfortunately:
https://www.radiomuseum.org/m/stcaus_aus_en_4~model.html

Have some other resources that I will look up for you tomorrow.

Be aware Acca Dacca sets can be deadly to work on. An isolation transformer is a prime requirement.


 
 Return to top of page · Post #: 3 · Written at 8:34:43 AM on 6 July 2019.
Arty41's Gravatar
 Location: Brisbane, QLD
 Member since 18 September 2010
 Member #: 118
 Postcount: 289

A while ago I restored a Crammond radio for a friend, same line up as yours. I wasn't happy that the live chassis had an open back with the potential of a disaster so I converted it to a transformer radio. The connections of the 25L6G are the same as a 6V6G , the 25Z6G is the same as a 6X5 using pin 8 as the cathode. All the filaments had to be rewired in parallel.
I can't remember exactly what component changes I made apart from the valves and transformer, it is still working with no problems almost 12 months later.


 
 Return to top of page · Post #: 4 · Written at 9:41:25 AM on 6 July 2019.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 802

Had a look in Steve Savell's STC book (1930-42). It mentions the following:

536/53 1936 console and tombstone cabinets, 5 valve dual wave
536Y 1940 console, 5 valve D/W

He also mentions one of the first STC radios after the war in 1945 as a 536B D/W.

1936 and before STC used the following letters after the number:
A AVC
D universal power supply (AC/DC)
B battery

After that letters seem to refer to the cabinet style.

If your radio still has its ARTS&P transfer and it has a letter before the number, might get an idea of the age from that. Or from dates on the speaker and/or speaker transformer.


 
 Return to top of page · Post #: 5 · Written at 1:11:40 AM on 7 July 2019.
Beakr's Gravatar
 Location: Bunbury, WA
 Member since 3 July 2019
 Member #: 2357
 Postcount: 2

Thanks for the responses and have emailed some photos through to the admin. I have a variac, limiter and isolation transformer setup to use while working on gear. Don't really have a stock of odd parts to do mods, the unit has a sound rear panel with plenty of screws holding it in place. Had another look for any date codes and found 28 OCT 1956 printed on the side of what looks like the speaker transformer cover. Thought it might have been a bit older than that! The Rola speaker has a model code K12. Cheers, Chris.


 
 Return to top of page · Post #: 6 · Written at 6:58:09 AM on 7 July 2019.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1403

Could possibly have a new speaker or speaker transformer.


 
 Return to top of page · Post #: 7 · Written at 7:44:09 AM on 7 July 2019.
Arty41's Gravatar
 Location: Brisbane, QLD
 Member since 18 September 2010
 Member #: 118
 Postcount: 289

You'll need a 302 barretter , I have one listed on an auction site, or get in touch with Kevin Chant in Perth, he may be able to help with parts, he's a very obliging person.


 
 Return to top of page · Post #: 8 · Written at 5:14:19 PM on 7 July 2019.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 5498

Photos uploaded.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 9 · Written at 6:07:00 PM on 7 July 2019.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 802

With an ARTS&P transfer without a letter, it is definitely post war. Cabinet style fits with that, too. There might be a date on the label under the chassis.


 
 Return to top of page · Post #: 10 · Written at 6:42:55 PM on 10 August 2019.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1289

Converting to transformer is a good idea. Much safer.


 
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