[Boatanchors] A "bit" off topic - Thin Audio Output in Vintage SS Rigs
jfor at quikus.com
Fri Jan 13 16:30:17 EST 2012
> Sorry if this is a bit off-topic. It pertains to Boatanchors, but of
> the non-hollow-state variety.
> In the ~ 40 year-old SS ham/consumer rigs I've seen, made with discrete
> components, the audio typically seems very weak and 'thin'.
Maybe it was always that way? Small speakers didn't use3d to have much of
a low end.
> Is there a general rule-of-thumb why this happens? Is this primarily
> because biasing resistors are aging "up";
> coupling capacitors are drying up and loosing value,
Possible, if they are electrolytics. Emitter resistor bypass caps could
also cause low end drop off by increasing negative FB at low frequencies.
> there's conductivity across the PCB, etc.
> In my limited experience, by contrast, the hollow-state BAs generally
> retain plenty of audio output, even when not in alignment or having RF
> Hy W2HY
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