One reason that an SB-220 can develop VHF parasitics is the following: the original suppressors use 2-watt carbon composition resistors. These resistors tend to increase in value when they age, and e
One reason that an SB-220 can develop VHF parasitics is the following: the original suppressors use 2-watt carbon composition resistors. These resistors tend to increase in value when they age, and
Vic is absolutely correct about resistors changing value due to heat/age/mistuning,etc. Another way to tame especially squirrly amps is to add a supressor to the cathode side in addition to the usual
On Nov 3, 2004, at 2:04 PM, Vic Rosenthal wrote: One reason that an SB-220 can develop VHF parasitics is the following: the original suppressors use 2-watt carbon composition resistors. These resisto
On Nov 3, 2004, at 4:02 PM, K7RDX wrote: Vic is absolutely correct about resistors changing value due to heat/age/mistuning,etc. Another way to tame especially squirrly amps is to add a supressor to
At 01:21 AM 11/4/2004, R.Measures wrote: <snip> A GS-35b has 0.12pF of anode-cathode feedback C. An 8877 has 0.10pF of it, so they have a fairly similar amount of internal feedback. Our 8877 low VHF-
OK...Strange a fellow would order your kit if he couldn`t solder the "Thing" in place.Jim. -- Original Message -- From: "R.Measures" <r@somis.org> To: "K7RDX" <k7rdx@earthlink.net> Cc: "Amps reflecto
-- Today's trivia question: At its max freq of 1000MHz, what is the -j1326 OHMS Dennis O. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
Feedback C on the data sheet is almost certainly measured at low frequency. The feedback characteristics at V/UHF might be different. By now there's lots of amps out there using the Russian planar tr
K7RDX wrote: My hf GS-35b AMP has a supressor only in the cathode and has been super stable for the last four years..... GS-35B amps on 432MHz, 144Mhz and 50MHz are unconditionally stable with NO par
On Nov 4, 2004, at 12:23 AM, Ian White, G3SEK wrote: K7RDX wrote: My hf GS-35b AMP has a supressor only in the cathode and has been super stable for the last four years..... GS-35B amps on 432MHz, 14
On Nov 3, 2004, at 10:43 PM, Tony King wrote: At 01:21 AM 11/4/2004, R.Measures wrote: <snip> A GS-35b has 0.12pF of anode-cathode feedback C. An 8877 has 0.10pF of it, so they have a fairly similar
On Nov 3, 2004, at 11:11 PM, K7RDX wrote: OK...Strange a fellow would order your kit if he couldn`t solder the "Thing" in place.Jim. He thought it was a bolt-on kit. -- Original Message -- From: "R.M
Correct On Nov 3, 2004, at 11:41 PM, Dennis12Amplify@aol.com wrote: In a message dated 11/4/04 1:10:35 AM Central Standard Time, k7rdx@earthlink.net writes: -- Today's trivia question: At its max fre
On Nov 4, 2004, at 12:15 AM, Steve Thompson wrote: Tony King wrote: At 01:21 AM 11/4/2004, R.Measures wrote: <snip> A GS-35b has 0.12pF of anode-cathode feedback C. An 8877 has 0.10pF of it, so they
The dielectric won't alter, but the impedances probably will. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/
R. Measures wrote: On Nov 4, 2004, at 12:23 AM, Ian White, G3SEK wrote: K7RDX wrote: My hf GS-35b AMP has a supressor only in the cathode and has been super stable for the last four years..... GS-35B
On Nov 4, 2004, at 11:47 AM, Ian White, G3SEK wrote: R. Measures wrote: On Nov 4, 2004, at 12:23 AM, Ian White, G3SEK wrote: K7RDX wrote: My hf GS-35b AMP has a supressor only in the cathode and has
At 02:47 PM 11/4/2004, Ian White, G3SEK, wrote: <snip> Neither of those responses addresses my point: if VHF amplifiers using these tubes are stable under worst-case conditions, where the input and o
for the VHF energy produced thereby to reach the load. Man I was waiting one somebody to finally say that =) Will Matney _______________________________________________ Amps mailing list Amps@contes