Re: Kolster-Brandes FB-10 - seems pretty deaf
From the notes I made on the middle version of the FB10 (6BE6, 6BA6, 6AT6, 6BW6, 6X5, red lettering, hum bucking output transformer and ferrite rod aerial) that I restored, I improved the front end gain by removing a load of lossy wax around the MW coil on the ferrite rod, changed the aerial trimmer to a 4-40pF compression type (the original was the awkward 'insulated wire wound round a stub of tinned copper' type and adjusted the MW coil position and trimmer to improve the front end alignment.
Ron
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