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1. [AMPS] 3CX800 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 14 Jun 1999 13:51:33 +0100; Are these tubes delicate? The local radio club has a 2m amp with one; the standing current has dropped by a half, and the RF output is way down. Suspicion is that it got over driven: the amp has no p; /archives//html/Amps/1999-06/msg00427.html (7,721 bytes)
2. [AMPS] 3CX800 (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 14 Jun 1999 09:06:28 -0700; ? For FM service, the rated max. cathode current is 0.6A. Anything more than that might cause cathode flaking. To see if there's any flaking, one can use a high-pot. to measure the leakage potential; /archives//html/Amps/1999-06/msg00435.html (8,355 bytes)
3. [AMPS] 3CX800 (score: 1): Author: RFpower@radiodan.com (Radiodan W7RF); Date: Mon, 14 Jun 1999 11:39:16 -0700; Delicate? Only a 4 watt grid dissipation! Better not make ANY mistakes at all with this tube! It is one of today's answers to "how do I make it smaller and cheaper or get more profit out of it" ampli; /archives//html/Amps/1999-06/msg00439.html (8,794 bytes)
4. [AMPS] 3CX800 (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Tue, 15 Jun 1999 07:02:03 +0100; --Original Message-- From: Radiodan W7RF <radiodan@mediaone.net> To: Peter Chadwick <Peter_Chadwick@mitel.com>; 'amps' <amps@contesting.com> To: <amps@contesting.com> Date: 14 June 1999 19:50 Subject; /archives//html/Amps/1999-06/msg00444.html (8,640 bytes)
5. [AMPS] 3CX800 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 15 Jun 1999 09:21:12 +0100; Thanks to all who replied. I figure that's probably one sick little puppy of a tube. I'll get it tested: but an amp for use by a radio club in contests needs pretty foolproof protection, I'd say. 73; /archives//html/Amps/1999-06/msg00446.html (8,062 bytes)
6. [AMPS] 3CX800 (score: 1): Author: agray@voicenet.com (Alan Gray); Date: Tue, 15 Jun 1999 05:23:07 -0400; Guess the same criticism could be leveled at the 4CX1500B for that matter. Alan, W3BV --Original Message-- From: Steve Thompson <amps@txrx.demon.co.uk> To: RFpower@radiodan.com <RFpower@radiodan.com>; /archives//html/Amps/1999-06/msg00450.html (10,116 bytes)
7. [AMPS] 3CX800 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 15 Jun 1999 10:31:20 +0100; And the 4CX1000. But both of those tubes were aimed at grounded cathode applications with very low grid dissipation. Anyhow, the 3CX800 apparently has no problems IF USED CORRECTLY - and to my mind,; /archives//html/Amps/1999-06/msg00451.html (8,472 bytes)
8. [AMPS] 3CX800 (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 15 Jun 1999 03:16:51 -0700; In a typical 4CX1500B Class AB1 amplifier, the grid-bias supply has enough series R to limit grid-diss. to a safe value in the event that the operator fails to adjust the grid bias to a level that a; /archives//html/Amps/1999-06/msg00452.html (11,540 bytes)
9. [AMPS] 3CX800 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 15 Jun 1999 11:29:10 +0100; Shouldn't the bias be set for correct zero signal plate current? Then limit the drive. There's also a maximum for grid circuit resistance. I was thinking of a 'last resort' ALC output for my 4CX1000; /archives//html/Amps/1999-06/msg00453.html (9,204 bytes)
10. [AMPS] 3CX800 (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 15 Jun 1999 08:55:17 -0700; ? ZSAC can be set quite nicely with E-screen. The primary consideration is to set the dc grid potential so that virtually zero grid current flows with max. drive. ? a sticky wicket when all transcei; /archives//html/Amps/1999-06/msg00455.html (10,370 bytes)
11. [AMPS] 3CX800 (score: 1): Author: RFpower@radiodan.com (Radiodan W7RF); Date: Tue, 15 Jun 1999 10:48:22 -0700; Fortunately, the 3CX1200 series and the 3CX3000A7 are both VERY rugged tubes. Instant on too. My 1987 date code 3CX1200A7 is still in service at full output and I DON'T baby my HENRY 3K Premier. Some; /archives//html/Amps/1999-06/msg00458.html (8,920 bytes)
12. [AMPS] 3CX800 (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Wed, 16 Jun 1999 08:08:04 +0100; A while ago someone mentioned an early version of the datasheet showing higher ratings. Is this available off the web anywhere, or could someone send me a copy please? Thanks, Steve -- FAQ on WWW: ht; /archives//html/Amps/1999-06/msg00469.html (8,509 bytes)
13. [AMPS] 3CX800 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 16 Jun 1999 10:44:52 +0100; Sure. But that affects the peak plate current. Having the screen volts set so that the correct peak plate current flows at Eg = 0, and then setting the bias for correct zero signal current is surely; /archives//html/Amps/1999-06/msg00471.html (9,260 bytes)
14. [AMPS] 3CX800 (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 16 Jun 1999 04:00:02 -0700; Peter - - ? agreed ? (assuming E-grid is set for virtually zero I-grid with max. drive) the indicator that something is amiss is when E-screen exceeds the max. allowable potential when ZSAC is set to; /archives//html/Amps/1999-06/msg00472.html (9,476 bytes)
15. [AMPS] 3CX800 (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 16 Jun 1999 05:25:06 -0700; Peter - - ? indeed ? yes ? The sticky wicket is a means of thwarting transceiver overshoot. With my method, the extant overshoot is taken into account by firstly setting E-grid so that virtually no g; /archives//html/Amps/1999-06/msg00473.html (10,628 bytes)
16. [AMPS] 3CX800 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 16 Jun 1999 13:27:01 +0100; -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.cont; /archives//html/Amps/1999-06/msg00474.html (8,483 bytes)
17. [AMPS] 3CX800 (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 16 Jun 1999 07:46:04 -0700; ? Unless one can tolerate the attn loss during Rx, one still needs a high speed relay at the attn. - later, Peter Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: ht; /archives//html/Amps/1999-06/msg00475.html (8,350 bytes)
18. [AMPS] 3CX800 (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 17 Jun 1999 09:28:39 +0200; One of the better articles on using/making a PA appeared in VHF Communications 4/1985 by DJ4GC "Two-metre Power Amplifier using Valve 4 CX 1000 A" and "Power Amplifiers - How they are operated" with; /archives//html/Amps/1999-06/msg00486.html (9,244 bytes)
19. [AMPS] 3CX800 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 17 Jun 1999 09:27:56 +0100; -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.cont; /archives//html/Amps/1999-06/msg00488.html (9,106 bytes)
20. [AMPS] 3CX800 (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 17 Jun 1999 02:29:14 -0700; ? I have not seen a case where advancing the mic. gain reduced the observed level of on the air splatter. ? Presumably, eliminating commas and periods plus shortening the pause between words would h; /archives//html/Amps/1999-06/msg00491.html (9,760 bytes)

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