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1. [AMPS] tube compatability (score: 1): Author: nw9g@netusa1.net (Steve Narducci); Date: Wed, 19 Nov 1997 00:02:34 -0500; is a 3cpx800a7 the same tube as the 3cx800a7 (difference being the "p"). and can 3cpx800a7 be a replacement for the 3cx800a7 in my titan amp? thanks....Steve -- FAQ on WWW: http://www.contesting.com/; /archives//html/Amps/1997-11/msg00257.html (7,784 bytes)
2. [AMPS] tube compatability (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 19 Nov 97 01:22:59 -0800; The 'p' usually means rated for pulse duty. It outta work ok in linear service. Are you replacing kaput tubes in your Titan 425? Rich-- R. L. Measures, 805-386-3734, AG6K -- FAQ on WWW: http://www.c; /archives//html/Amps/1997-11/msg00258.html (8,124 bytes)
3. [AMPS] tube compatability (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 19 Nov 1997 10:58:24 +0000; The tubes are not the same - the 3CPX being desinged primarily for pulsed use - the P indicates pulsed. However, you probably can use the pulsed (3CPX) tube, but there is likely to be some difference; /archives//html/Amps/1997-11/msg00263.html (9,380 bytes)
4. [AMPS] tube compatability (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 19 Nov 97 06:44:05 -0800; With 13.0 v on the heaters, probably about 20k hours, Steve. However in the Titan 425 I worked on, both tubes were on the verge of failure after 25 operating hours. - The symptom was an arcing probl; /archives//html/Amps/1997-11/msg00270.html (9,361 bytes)
5. [AMPS] tube compatability (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 20 Nov 1997 07:17:51 +0000; Same tube in this case Steve, but better testing. Be sure to add a grid over-current protection circuit to your amp. If it does not have one, or you will eat up the new tubes. A fuse is NOT enough,; /archives//html/Amps/1997-11/msg00283.html (8,588 bytes)
6. [AMPS] tube compatability (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 20 Nov 97 09:29:33 -0800; - 100mA equates to about 2.7w. Mr. Rauch assumes that all bouts of excessive grid current in 3CX800A7s/8877s/8874s ... is due to operator error, et cetera -- a.k.a. Not Invented Here Syndrome. . Dur; /archives//html/Amps/1997-11/msg00294.html (8,831 bytes)
7. [AMPS] tube compatability (score: 1): Author: al511@freenet.uchsc.edu (Robert Neece); Date: Thu, 20 Nov 1997 14:52:46 -0700; Agreed. My copy of Bill Orr's Radio Handbook shows one version of a grid over-current protection circuit designed, as I recall, by W8ZR. Some years ago, a fellow (might have been ZR) was selling prin; /archives//html/Amps/1997-11/msg00297.html (8,599 bytes)
8. [AMPS] tube compatability (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 20 Nov 97 14:48:35 -0800; It might be a good idea to take a look at the insides of a kaput, out-of-warranty 3CX800A7 beforehand. To do this, clamp the kaput tube's anode in a vice. Use a 32-tooth/inch (sheet metal cutting) c; /archives//html/Amps/1997-11/msg00299.html (10,232 bytes)
9. [AMPS] tube compatability (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Fri, 21 Nov 1997 08:21:05 EST; On Thu, 20 Nov 1997 14:52:46 -0700 al511@freenet.uchsc.edu (Robert Neece) writes: W8ZR's was an 8877, that Orr Handbook circuit has also been updated by ZR ( Prez of Miami University) but not publish; /archives//html/Amps/1997-11/msg00305.html (9,781 bytes)
10. [AMPS] tube compatability (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 21 Nov 1997 09:50:21 +0000; We've been over this a hundred times. You wrongly insist you can simply multiply the RMS drive voltage against the indicated meter current. That's nonsense. We have no idea what the grid dissipation; /archives//html/Amps/1997-11/msg00307.html (9,170 bytes)
11. [AMPS] tube compatability (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 21 Nov 1997 09:50:21 +0000; Hi Bob, You might contact Ten Tec and see what they did to the later units. Otherwise, Ameritron can sell a timer-overload board that is easily modified for any rig. It responds within a few millisec; /archives//html/Amps/1997-11/msg00308.html (9,253 bytes)
12. [AMPS] tube compatability (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 21 Nov 97 14:42:34 -0800; maybe several - - - unless I'm coming down with Alzheimer's, Ted. I find it nonsensical that Mr. Rauch messed up when he tuned up this amplifier. My guess is that the amplifier was not being grossly; /archives//html/Amps/1997-11/msg00313.html (12,142 bytes)

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