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 Thorn (AWA) Stereo Radiogram
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 Return to top of page · Post #: 1 · Written at 2:44:35 PM on 10 March 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

Hoping to find a circuit?

This one melted down the transformer. It would be nice to know correct voltages as the metal type rectifier is what killed it.

Transformer in photo (sent to Brad) is not the original.

Valves 6AN7 (Pentagrid); 6N8 (IF & detector); Two 6GW8's (Triode Pentode: Output SE not PP) OP transformers 1968.

Only other Nr that might mean something 6752?


 
 Return to top of page · Post #: 2 · Written at 5:01:59 PM on 10 March 2019.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 5262

Sounds like it's model RG106: https://www.radiomuseum.org/r/thornaus_stereogram_rg106.html

The entry there is by Martin Kent who cites the service manual. Maybe someone can contact Mr Kent?


 
 Return to top of page · Post #: 3 · Written at 6:39:46 PM on 10 March 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

Thanks I will check it out.


 
 Return to top of page · Post #: 4 · Written at 8:08:10 PM on 10 March 2019.
Vintage Pete's avatar
 Location: Cromer, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1050

I have some 1960s Radiogram transformers.
Might be able to match something up for you.
Pete...


 
 Return to top of page · Post #: 5 · Written at 8:22:26 PM on 10 March 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

Pete,

Got a transformer, it should be around 250V guy never told me what it put out but it should be OK. However, this one is X-0-X where the old one was a full wave bridge no transformer CT.

The 1N4007's will be more efficient. the other issue is the caps are 350PV, not a voltage rating I consider ideal. 2 by 50μF; one 100uF;
With the new combination I would prefer not less than 500V & drop Nr 1 to perhaps lower voltage, or reduce it. Still need them, or four 47uF

The objective, in the face of no info, is to find what volts the valves ran on originally: The valves should handle 250V.


 
 Return to top of page · Post #: 6 · Written at 8:28:24 PM on 10 March 2019.
Vintage Pete's avatar
 Location: Cromer, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1050

Ok, I basically understand.
If you need it at some stage I will dig it out for you.
Transformers always a hassle when their stuffed!
Pete


 
 Return to top of page · Post #: 7 · Written at 12:44:18 PM on 11 March 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

I did post a pic of it. It actually dropped enough, hot stuff onto the terminal block that it stuffed it as well.

Meanwhile I have separated and STC 236 from its cabinet & has taken over an hour to get the dust & crap out of it. I see a broken / burnt resistor & the meeces have had fun turning a few caps into ratatouille.

Marc


 
 Return to top of page · Post #: 8 · Written at 4:40:59 PM on 6 April 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3701

OK! We can stop looking. I have a copy of the circuit & naturally the dial stringing, after I had already sorted that out. The bits on the drum did not burn.


 
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