> >Rich wrote:
> ? Most of the people I knew in CA, NV and AZ who initially purchased
> one-tube and two-tube Viewstar amplifiers experienced intermittent
> output-bandswitch arcing problems and returned the ampifiers to dealers
> for repair. Within months, no dealer in CA, NV and AZ was carrying
> Viewstar amplifiers. It is my opinion that reports of bandswitch arcing
> can not be overcome by marketing. . . Since the output bandswitch had
> a breakdown potential much greater than the anode supply V, there should
> have been no arcing problems from the HF potential present.
> . Not long after "Parasitics Revisited" appeared in the September and
> October, 1990 issues of *QST* magazine, I received a telephone call from
> QST-staffer James "Rus" Healy. Rus told me that he had just received a
> telephone call from one of the designers who had been involved with the
> Viewstar amplifier. Rus said that this designer described mysterious
> problems with an under-development amplifier that sounded to Rus like the
> problems might be VHF-related. Rus said he recommended that this person
> telephone me - which he eventually did. We talked, however, my guess,
> based on subsequent events, is that he balked. .
> - Free, unsolicited advice from yours truly: When a tube manufacturer
> gives ratings for Amplifier or Oscillator Service, it's nothing to sneeze
> at.
> - cheers
Truly a classic case of a "for the lack of a half-penny worth of tar the ship
sank". Why
are some designers so obstinate? Everyone can learn from others experience.
John ZS5JF
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