Re: Post from newbie

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "robert & june heidlebaugh by way of Terry Fritz <teslalist-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>

Terry: un like an amature transmitter ths TC demands high pimary current .
Class c is best for tube operation. Transmitting capacitors work for tube
coils, but not well for spark coils as they will not stand the high current.
With that in mind you should not have any problem.  Like a transmitter
tuning is everything. If you build a secondary match the primary to it or
slightly lower. The use of a top (toroid capacitor hat ) drops the secondary
frequency so the primary should be adjustable to match that. Most TC's use
low frequency ,100-200 Kc, to avoid interfearance trouble with other
services.  Figure a 1000-1350 Turn secondary. Some coilers go smaller, but
not with a 4-1000A. That is a tough tube that should serve well. Have fun.
      Robert  H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Mon, 24 Feb 2003 07:50:10 -0700
 > To: tesla-at-pupman-dot-com
 > Subject: Post from newbie
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Mon, 24 Feb 2003 07:53:45 -0700
 >
 > Original poster: "JERRY ASHLEY by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 > <jerryla-at-ix-dot-netcom-dot-com>
 >
 > Hi,
 >
 > My name is Jerry.  I have been a ham radio operator for the past 50
 > years but I am new to tesla coils.  I just retired and have more time to
 > build "stuff".  I have worked as an electronic tech for most of my life
 > and have built a lot of ham gear, including transmitters, receivers and
 > antennas from the HF bands up through 432 MHz.  Power levels up to 1000
 > watts.
 >
 > I have been reading the mail for about six months but I have not seen
 > much info on tetrode tube coils.
 >
 > I have a 4-1000A tube and would like to try my hand at building a VTTC.
 > I plan to use six MOTs wired in series/parallel to give twice the
 > voltage and three times the current of a single transformer.  This
 > should supply 4 to 5 KV at about 700 mA, close to the specs of the
 > tube.  I plan to connect the raw AC directly to the plate tank of the
 > tube.  I am going to use the tube in a triode configuration by
 > connecting a 10K resistor between the control and screen grid and feed
 > the input signal to the screen.
 >
 > I would appreciate any comments on this design.
 >
 > Would I need PFC caps on the MOTs?
 >
 > I have some questions concerning the design of the primary and secondary
 > coils.  A ballpark design in this area would help me a lot.
 >
 > Primary diameter?
 > Primary wire size?
 > Number of turns?
 >
 > Secondary diameter?
 > Secondary wire size?
 > Number of turns?
 >
 > Number of turns on the grid coil?
 >
 > Size of grid leak components?
 >
 > I have some large mica transmitting caps to use in the grid leak and
 > primary tank.
 >
 > Thanks,  Jerry  -  W8UJX
 >
 >