[AMPS] B&W PT2500

[John Fielding]

> >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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