Re: In need of a vacuum tube

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

My coil uses two 811a tubes.  It came with two "cheap" China 
types,  the top caps fell off and one fell out of the socket (new in 
the box...).  After re-gluing them one just arced over immediately...

I replaced them with Svetlana from RFparts.com and the new ones have 
worked perfectly.

The 811a is actually obsolete and may no longer be made.  The 572B is 
pretty much a drop in replacement for it though and can run higher power.

http://www.rfparts.com/tubesvet.html

So "I" wound get Svetlana so they work and get the 572B which is an 
improved version.

http://www.rfparts.com/572bprices.html

Cheers,

        Terry




At 12:31 PM 3/18/2006, you wrote:
> Hello all,
> originally i had planned to use an 811A tube for my first ever VTTC. 
> I got a cetron on ebay for 17$ and when i attempted to assemble it 
> into the circuit, the metal cap on top just popped right off :-( I 
> contacted the seller and he agreed to send another. But apparently 
> he never sent it as its been weeks now and my apartment complex says 
> still nothing from him. I guess it could have been lost in the 
> mail(although it was shipped priority mail). So now im in need of a tube.
>
> I was wondering if anyone here has a used one they would be willing 
> to sell?Id have to st ick with an 811A tube or similar because my 
> filament xfmr is only  rated for 4amps at 12.6volts(I use the center 
> tap for 6.3).
>
> Thanks again!
> Matt