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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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25th Oct 2021, 8:45 pm | #1 |
Tetrode
Join Date: Sep 2006
Location: Chelmsford, Essex, UK.
Posts: 85
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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. |
25th Oct 2021, 8:55 pm | #2 |
Dekatron
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
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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. |