813 tube tc coil

• To: tesla-at-pupman-dot-com
• Subject: 813 tube tc coil
• From: Mazzilli Vladimiro <mazvla-at-iol.it> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Sat, 13 Mar 1999 11:31:40 -0700
• Approved: twf-at-verinet-dot-com

Hi all
I've asked about te wiring of a tetrode or a pentode in a tube TC coil
and Someone Have me  suggested to tie the three grid together, but in te
triode connection of a tetrode or pentode, te tube will not run at full
plate rating voltage (for 813 =2500V)
is better to tie te last grid to te filament (dynamic connection), and
the screen grid appropriately connected by a resistor (in general
variable to fix the oscillator plate current), at rated grid maximum
voltage. The reason of that is that in Italy is very difficult to have a
power triode for a cheap price, I've read in USA for a 833A a price from
20 to 50 USD; in Italy if you have a good luck to find it, you have to
spend about 150 USD or more.


sincerely
Vladi

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