[R-390] Clevite Filters

Tom Norris [email protected]
Thu, 27 Nov 2003 13:22:28 -0600


>Dennis:
>
>The Clevite filters were used in the 1960 EAC contract (23137-PC-60).
>
>I seem to remember only several hundred were so fitted. The consensus is that
>they were a failure, but I don't recall why. I would be disinclined to go to
>the trouble of putting them in.
>
>Perhaps someone with personal experience with them can comment on their
>sound?  I doubt if there are a lot of them still out there in operating rigs.
>
>Randy

Just a few years ago I had a 1960 EAC 390A with the Clevite filters. 
The "sound"
was more like the 390 non-A. Not as sharp as the mechanical filters, 
but they did
seem to attenuate the higher freqs. I should have at least kept the IF deck,
but I rebuilt and sold the radio some years ago. As to why they were a failure?
That was apparently a contract issue, the characteristics of the 
ceramic filters
are quite a bit different than those of mechanical filters, and I 
believe an action
taken against EAC for not meeting specs on that run of receivers.

Tom KA4RKT