Original poster: Ed Phillips <evp@xxxxxxxxxxx> Tesla list wrote:
Original poster: Fucian@xxxxxxx 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
Is the lead through the top of the tube still intact and long enough to solder to? If so, you can connect directly with a small clip lead. Not uncommon for tube caps to come off. If the lead is still there often all you need to do is melt the solder out of the top of the cap, poke the lead through the hole in its center, and solder. Of course you need to cement the cap in place first without messing up the possibility of soldering..
Unfortunately hi fi nuts pay lots of money for almost any transmitting triode so the price is inflated. I find new Chinese 811A's listed for $12 at
http://www.vacuumtubes.net/prices.htm and used (presumably US) for $14.00 at http://www.vacuumtubes.net/prices.htm Ed