Quote:
Originally Posted by Sideband
Generally IF alignment is pretty stable. Unless you are unlucky and a parallel tuning cap in the coil fails O/C then usually you won't have a problem. I wonder if the UABC80 you have has unbalanced diodes? Just speculating here but in the days of normal replacements where Mullard or Mazda were used, the tolerance was pretty tight. Now of course we more-or-less have to use what is available which could be any form of import where tolerances were perhaps not as close (and suppliers have also been known to unwittingly sell rejects....simply because they buy apparently new valves from any available source). If I have a chance over my busy weekend (dog-sitting for my son....) I'll have a look amongst my valves and see if I have a new or used UABC80 of known provenance.
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Hi Sideband, that'd be cool - If you have, just let me know what you want for it..
Pete