Re: VTTC from Eimac 8755 on eBay

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dr. John W. Gudenas" <comsciprof@xxxxxxxxxxxxx>

Greetings Steve
We have an old AM radio tech on campus that ran racks of 833A tubes.
I asked about that glass extension.
He indicated that he had "heard" they were used in an out gassing
operation then sealed at the tube  and put in service although he
hadn't seen any.
Hearsay is hearsay, but I don't believe those tubes are intended to
stay there during service. I couldn't find anything in Tube Lore or
my RCA manual.

I agree, its just best to avoid them. Plenty of other options now for
833A or C. Get back to that EE degree and stop answering these
questions.
Best
John

John W. Gudenas, Ph.D.
Professor of Computer Science

On Feb 4, 2007, at 10:11 PM, Tesla list wrote:

> Original poster: "Steve Ward" <steve.ward@xxxxxxxxx>
>
> Can anyone comment on the long tube of glass sticking out of the
> bottom of those 833s?  Looks like a big PITA to hande, since that
> would obviously be a very good point to break the glass.
>
> Also, $150 is too much money, even for a new 833.  You can get a penta
> 833A for 90 bucks, or an 833C penta for 95 last i recall (search for
> penta tubes).  Or, even RF parts has pretty similar prices, both under
> $100 for each type of tube (taylor tubes).  I dont know if the amperex
> brand is really worth the extra money for any reason, particularly for
> a hobby where the tube will likely never be run for its entire
> lifetime spec.
>
> Steve
>
> On 2/3/07, Tesla list <tesla@xxxxxxxxxx> wrote:
> > Original poster: Mddeming@xxxxxxx
> >
> > Hi Chris
> >
> > Try eBay:
> >   item #160080409906 -- 33 Brand new in factory box Amperex 833As
> > available @$150 + S&H
> >
> > item # 5880851287 -- Cooling fan assembly for 2 833As $23.00 + S&H
> >
> > Matt D.