Original Website © Amplabs 2009 This new site created February 2024
Our FM3 service includes:
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Fault diagnosis.
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Replacement of out of tolerance (OT) components, including faulty indicator lamps*.
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Full RF, IF and stereo decoder alignment check & adjustment as required.
Many FM3s we receive in for service require re-alignment. During realignment, at best, just a couple of coil or trimmer
adjustments are required. On the odd occasion, we get a bad one where virtually all adjustments are out. This is usually
due to, amateur twiddling or poor storage. Often the silvering on the trimmer capacitors has turned to silver sulphide leaving
a black ,flaky, deposit. The only solution is to replace the full set. One common occurrence, despite the stereo indicator
suggesting otherwise, is the almost complete absence of a stereo image.
If your indicator and dial amps are faulty, we can replace them with solid state led circuits or the original 14V filament type.
This is not just a case of replacing the filament lamps with LEDs. The tuning indicator modification incorporates extra
components to reduce flickering. The new led circuit works as follows:
On a centered-station both indicators extinguish completely. 'When the dial is slightly off a station, the right or left LED turns
on indicating too high or too low a dial setting, respectively. The LEDs we use are diffused types with soft subdued
illumination.
If your lamps are intact we prefer to leave them as the original 14V filament type.
The tuning LED colours we use:
Tuning pair: Orange
Stereo: Red
Quad FM3 Our Standard Full Service (QFM3FS)
For ure listening pleasure