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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Quad 2/Quad II tuner problem
Repairing this hybrid tuner of about 1968,valve/tube tuner
and transistor stereo decoder in 2 separate sections. I have the schematics but more a general query. The problem was lack of stereo which I have realigned (for strong signals) but I think the main problem is lack of signal to decode. Output for stations 96 MHz to 100 MHz strong but 100 to 104 MHz output is much reduced. Is this more likely due to loss of gain in one or more of the valves or drift of RF/IF alignment ? e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse Nigel,Diverse Devices,Southampton,England |
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Quad 2/Quad II tuner problem
On Wed, 13 Aug 2003 15:08:08 +0100, "Nigel Cook"
wrote: Repairing this hybrid tuner of about 1968,valve/tube tuner and transistor stereo decoder in 2 separate sections. I have the schematics but more a general query. The problem was lack of stereo which I have realigned (for strong signals) but I think the main problem is lack of signal to decode. Output for stations 96 MHz to 100 MHz strong but 100 to 104 MHz output is much reduced. Is this more likely due to loss of gain in one or more of the valves or drift of RF/IF alignment ? Hello Nigel Possibly both but alignment will certainly need doing. You will also find that various small capacitors which live inside the screening cans tend to drift in value with time and temperature in an unpredictable manner. Best to replace anything dubious and realign carefully right through properly. Realigning for strong signals will also tend to give variation over the waveband and other subtle odd effects, even dead spots. This tuner will give excellent results but I'm afraid there's no real substitute for proper realignment by the book; however this will repay dividends in full measure..... Its a very nice tuner. Good luck Anthony -- Just because I'm paranoid it doesn't mean they're not out to get me... |
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