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 STC radio information
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 Return to top of page · Post #: 1 · Written at 8:10:15 PM on 23 June 2016.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 30

Hello, wondering if anyone can help point me towards information\schematics for STC radios.

I have purchased the amp and internals of one but am unsure of the model. The sticker on the back of the frequency panel has nothing written beside model or serial number.

The valves used in the unit are 6BA6, 12AX7, 5Z4, 6N8, 6BA7, and 6L6GA.

Unit was made in Australia.

Does anyone have any idea where I might find a model number?

Regards

Gary


 
 Return to top of page · Post #: 2 · Written at 8:44:23 PM on 23 June 2016.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5830

I can't find anything with that particular valve line-up for any brand in the usual places.

Are you sure those are the original valves? Are they shown on a chassis sticker?

The closest I can find for STC is a NINE valve set (model A8471) with this line-up:

6BA6 6BA7 6N8 12AX7 EM85 12AT7 6BW6 6BW6 5Z4G

... a two-speaker console radiogram with numerous short wave bands as well as the broadcast band.

Some good, in-focus, photos may help.


 
 Return to top of page · Post #: 3 · Written at 8:50:26 PM on 23 June 2016.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4178

Something rather odd but they did odd things, 6V6 was the most common OP valve that I saw at a glance.

6BA7 is not what I see as a commonly used Pentagrid; albeit that if there was an obscure one out there then they would just have to used it.

A8231 should not be overlooked. but it has a PP output

Marc


 
 Return to top of page · Post #: 4 · Written at 9:07:14 PM on 23 June 2016.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 30

They are what is shown on the chassis sticker.

However, the 6L6GA has been crossed out and KT66 written in as apparently at some point it was modified to use the KT66.


 
 Return to top of page · Post #: 5 · Written at 9:09:18 PM on 23 June 2016.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 30

The frequency panel does have 3 short wave bands on it


 
 Return to top of page · Post #: 6 · Written at 9:14:18 PM on 23 June 2016.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4178

I think it may be radically modified with KT66. 6CA7 is odd as it is an output tube in itself. I have only once seen a production "special" radio with an OP tube used to drive a 6A6 transformer coupled.

I think we have not got all the valves listed I expect 12AX7 to be a phase-splitter for paraphase push pull, not a single ended op. unless we have stereo?

Marc


 
 Return to top of page · Post #: 7 · Written at 9:15:49 PM on 23 June 2016.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5830

However, the 6L6GA has been crossed out and KT66 written in as apparently at some point it was modified to use the KT66

KT66 was rarely used by Australian radio manufacturers. Would usually be found in high end sets.

Difficult to know what you have there. Photos?


 
 Return to top of page · Post #: 8 · Written at 9:19:07 PM on 23 June 2016.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 30

I have sent a photo of the frequency panel to be added to the post. I will get some more pics tomorrow.

STC Radio Tuning Dial


 
 Return to top of page · Post #: 9 · Written at 9:26:03 PM on 23 June 2016.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 30

On the rear of the chassis it has sockets for 12 inch speaker, 5 inch speaker and PU


 
 Return to top of page · Post #: 10 · Written at 9:33:39 PM on 23 June 2016.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5830

it has sockets for 12 inch speaker, 5 inch speaker and PU

... so it's from a not inexpensive console radiogram. The question remains: which one?


 
 Return to top of page · Post #: 11 · Written at 10:13:50 PM on 23 June 2016.
GBR's Gravatar
 GBR
 Location: Gladstone, QLD
 Member since 15 May 2016
 Member #: 1925
 Postcount: 30

Just found this one on gumtree. http://www.gumtree.com.au/s-ad/hope-valley/collectables/old-stc-radiogram/1109437702

It has the same frequency panel as the one that I have. It also looks like it has one large and one small speaker.


 
 Return to top of page · Post #: 12 · Written at 10:33:49 PM on 23 June 2016.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5830

Ad says: "When plugged in, the light works but I have not heard any sounds from it." ... she's lucky she didn't hear BANG! followed by acrid fumes.

Good find. Should ask the seller to tell us the valve line-up (assuming it has a chassis sticker)

BTW: what you're referring to is usually called the dial


 
 Return to top of page · Post #: 13 · Written at 10:45:56 PM on 23 June 2016.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5830

Here's a similar looking unit (topside, at least) in an ad for vintage audio repairs in WA:

http://www.gumtree.com.au/s-ad/ballajura/other-audio/vintage-audio-electronic-repairs-service-and-restoration/1041969312

Business owner Vic may be a member here (Viccadillac?), otherwise could ask him what model that is.


 
 Return to top of page · Post #: 14 · Written at 12:38:29 AM on 24 June 2016.
Viccadillac's Gravatar
 Location: Perth, WA
 Member since 7 May 2012
 Member #: 1140
 Postcount: 152

Yes GTC That's me,

I also have a spare chassis , so can offer assistance . I think I have schematics as well .

Cheers


 
 Return to top of page · Post #: 15 · Written at 12:43:55 AM on 24 June 2016.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5830

I also have a spare chassis , so can offer assistance . I think I have schematics as well .

We do manage to track 'em down Smile

For the record, Vic, when you get a minute please let us know the model number.


 
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