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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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16th Apr 2018, 11:44 am | #21 |
Hexode
Join Date: Aug 2008
Location: Essex, UK.
Posts: 370
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Re: B&O radiogram model 1200RG.
I am new to B&O gear and have just had the chassis from one of these land on my bench. No FM. I thought that I'd get away with an AF11x series transistor but the fault is in the FM tuner head. Injecting 10.7 at the output shows IF to be fully functional.
Any of you chaps had success in repairing the tuner module. The voltages around the 2 BF115's look as per diagram. Shall I start a new thread?
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6.3v on my heaters is no longer enough to get me going in the morning!! Last edited by pichacker; 16th Apr 2018 at 12:09 pm. |
16th Apr 2018, 10:34 pm | #22 |
Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,219
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Re: B&O radiogram model 1200RG.
Here is a picture of said spring and where its fitted to on the arm
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16th Apr 2018, 11:36 pm | #23 |
Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,958
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Re: B&O radiogram model 1200RG.
My experience of B&O FM tuners (admittedly in radios such as the Beolit 600) using BF115 transistors is that the BF115 is now quite unreliable, considering it is a metal cased four pin TO18 style (TO72) device.
Ron |
17th Apr 2018, 7:39 am | #24 |
Hexode
Join Date: Aug 2008
Location: Essex, UK.
Posts: 370
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Re: B&O radiogram model 1200RG.
Thanks Ron. This will be my first port of call and sorry for hijacking the thread.
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6.3v on my heaters is no longer enough to get me going in the morning!! |