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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

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Old 25th Oct 2021, 8:45 pm   #1
x72
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Join Date: Sep 2006
Location: Chelmsford, Essex, UK.
Posts: 85
Default Regency TR1-G Repair

In 2009 I repaired a Regency TR1-G for a friend. I recently
rediscovered the photos and notes.

C1 to C4 were replaced by surface mount tantalum capacitors on the rear
of the PCB. To preserve the look of the board from the top, I removed
one leg of each of the existing capacitors from the PCB. The legs were
bent out of the way. The red circles show where the original capacitor
legs were soldered and the lines point to the corresponding new
capacitors.

The sensitivity was still very poor. Checking the bias of all the
transistors showed X3 was almost turned off. I tried to find a
cosmetically similar replacement but, in the end, I just re-biased the
existing device. I put a 13k, 1206, resistor across R9 (circled yellow).
That increased the overall current by about 1mA and brought the radio
back to life. I didn't spend time analysing the fault once the radio was working.
I might have re-aligned it but don't think it needed much tweaking.

I don't know what happened to the this radio so if anyone has S/N 35134
TR1-G, please let me know by PM.
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Old 25th Oct 2021, 8:55 pm   #2
FERNSEH
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Location: Gateshead, Tyne and Wear, UK.
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Default Re: Regency TR1-G Repair

From Wikipedia: the Regency TR1. The world's first commercially made transistor radio, 1954.
https://en.wikipedia.org/wiki/Regency_TR-1

From the Radio Museum: the Regency TR1G, 1955.
https://www.radiomuseum.org/r/regency_tr_1g_tr1g.html

DFWB.
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