Ultra TR101 transis...
 
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Service Data Ultra TR101 transistor radio.

 
malcscott
(@malcscott)
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Hi, anyone got the cct diag for this Ultra TR101 radio? Cheers, Malc.

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Topic starter Posted : 23/12/2021 2:18 pm
Nuvistor
(@nuvistor)
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Posts: 4142

@malcscott 

Radiomuseum have the R&TV details, circuit, layout, voltages etc.

https://www.radiomuseum.org/r/ultra_transistor_101_tr101tr_10.html

 

Chris may have one in his pile for the Scan On Demand.

 

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Posted : 23/12/2021 2:26 pm
crustytv
(@crustytv)
Vrat Founder Admin
Posts: 11259

I have the Ultra manufacturer's service manual. I'll get it scanned, when I have a spare half hour or so. If you're in a hurry, Paul offers it for download here.

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p.s.

If anyone comes across the TR70. I've been looking for one of those for years, it was our kitchen radio I remember as a child.

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Posted : 23/12/2021 3:07 pm
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crustytv
(@crustytv)
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Posts: 11259

I'm being a lazy sod, will this do you, taken with a camera. If not, I'll set the scanner up later.

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Posted : 23/12/2021 3:30 pm
Nuvistor
(@nuvistor)
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@crustytv 

Some interesting designs in the circuit, the photos are excellent.

Negative feedback in the audio path, and the IF stages requiring neutralising with the earlier transistors. The diode D2 was, if memory serves me right to stop strong signals blocking the signal due to AGC action but willing to be put right if my memory is false.

 

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Posted : 23/12/2021 3:55 pm
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malcscott
(@malcscott)
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@crustytv Cheers Chris, this will do great. Cheers, Malc.

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Topic starter Posted : 23/12/2021 4:21 pm