Hey Tom,
NIH syndrome, sorry.
No further comments.
Jos
_____________________________________________________________
----- Original Message -----
From: "Tom Rauch" <w8ji@contesting.com>
To: "rlm" <2@vc.net>; " AMPS" <amps@contesting.com>
Sent: Tuesday, March 04, 2003 8:32 PM
Subject: Re: [Amps] 8877s, ETO and the General Electric Contract
> > Subject: 2 pcs returned 8875 S/N G8AD-241 and F8VD-428J, for evaluation.
> > Reference: Your letter dated 21 January 1986; EIMAC RPA #SC-2303.
> >
> > Dear Richard:
> >
> > Your letter about parasitics is quite interesting, and it appears your
> > two tubes have had the same trouble. The emission was poor on test, and
> > consequently other test results looked bad. The tube engineer then cut
> > them both open for an internal examination.
> > Both have been badly overheated internally, the apparent result of an
> > oscillation condition. The grid in these tubes is gold plated and if
> > overheated the gold vaporizes off, of course, and some of it inevitably
> > lands on the oxide cathode, and that poisons emission.
>
> What you always conveniently leave out is that in YOUR initial report to
> Eimac you said you "thought the tubes oscillated, and that overheated the
> grids".
>
> The response to YOUR claim you suspected there was an oscillation, from a
> guy whose job it was to handle customer letters, included the sentence:
>
> > Both have been badly overheated internally, the apparent result of an
> > oscillation condition.
>
> If I take my truck into Ford with melted main bearings, and say to the
> service writer "I think I ran it out of oil"...and if that truck has a
> busted oil pump....Ford's response would almost certainly be "apparently
you
> ran it out of oil".
>
> It very interesting how you manipulate answers to fit your fascination
with
> oscillations. But the fact is it is impossible to tell WHY the grid was
> overheated, but the particular amplifier you selected has NO grid current
> protection and some models did not even include a grid current meter!!!
>
> 73 Tom
>
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