** Peter -- Svetlana 572Bs reportedly have more VHF gain than other brands. -- Tetrodes with both grids grounded have very little anode-cathode feedback-C, which should make them more stable than a
** The problem with the 3cx1200A7 (and the 3-1000Z) is that it has roughly 7x as much feedback-C (Anode-cathode C) as an 8877. Although more feedback-C is beneficial in VHF oscillators, it can be a p
** In amateur service, it should be virtually impossible to short a 50w 12v zener. Ny guess is that some anomaly caused the zener to short and if this problem is not addressed, the replacement will e
On Thursday, October 23, 2003, at 05:06 PM, Dave Haupt wrote: Ed, The difference between the '1200 and '1500 in feedback capacitance is only 2:1, ** There is apparently a typo in Eimac Catalog 175. T
The 3cx1200A7 is supposedly on Eimac's to-be-discontinued list. Their new 3cx1200Z7 is clearly a superior bottle - unless one is trying to build a 1500w VHF oscillator. On Friday, October 24, 2003, a
On Friday, October 24, 2003, at 09:33 AM, Dave Haupt wrote: Rich, Feedback capacitance is certainly a worthy consideration. To accurately model the potential trouble spots, it needs to be made a part
On Friday, October 24, 2003, at 08:42 AM, Vic Rosenthal wrote: Aargh! I SHOULD have said: You probably know this, but the correct way to do it is to temporarily put a non-inductive resistor equal to
On Friday, October 24, 2003, at 06:39 AM, Bill Coleman wrote: Hi Mike, you may be on to something... I am not familiar with the '78, but will relate something I have personally done & seen done by ot
** It should not be possible to do this to a 500v mica with normal operation. A glitch seems likely. - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org ______________________________________
** Surely, but the L still needs to be correct in order to arrive at the needed Q of c. 2. - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org _______________________________________________ A
** Looking at all of the pieces with a magnifing glass? - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.co
** L figures into Q, so L can't be just anything if C-in and C-out are adjustable. - R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org _______________________________________________ Amps mai
On Wednesday, October 29, 2003, at 01:00 PM, Mike Tubby wrote: -- Original Message -- From: "GGLL" <nagato@arnet.com.ar> To: "Amplificadores Lineales" <amps@contesting.com> Sent: Sunday, October 26,
On Wednesday, October 29, 2003, at 09:40 AM, Mark Toussaint wrote: Hi; I'm converting an old sb-220 to work on 50mhz. I need a low value tune cap and want to use a Jennings vacuum variable of 2-30pf,
On Wednesday, October 29, 2003, at 07:45 PM, John wrote: I have a question to the tubers out there. What determines the Anode voltage rating on a tube ?? ** Tarot cards? Ouija board? It's less than w
On Thursday, October 30, 2003, at 03:18 AM, Bill Turner wrote: On Wed, 29 Oct 2003 09:40:27 -0800 (PST), Mark Toussaint <n1mt@yahoo.com> wrote: I'm converting an old sb-220 to work on 50mhz. I need a
** To tune up a 30L-1 for SSB, apply full drive using high speed dits to relieve stress on the PS as well as the delicate 811A plates/anodes. Tune and Load for max relative output. Plate/anode curren
On Friday, October 31, 2003, at 12:43 PM, John T. M. Lyles wrote: Oil works too. We use it at work to standoff 90 KV DC for big klystrons, while affording some cooling. We use Shell Diala. Biggest co
** Does anyone know of a Globar distributor who would sell one 200w unit? Thanks. Rich Measures, AG6K, 805.386.3734. www.somis.org/ _______________________________________________ Amps mailing list A
On Sunday, November 2, 2003, at 09:48 AM, RFlabnotes@aol.com wrote: I have an old 30L1, which has been in and out of use here for some time. It has also been the cite of several interesting ( and not