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1. [AMPS] 4CX1000A advice?? (score: 1): Author: w7iuv@axtek.com (Larry Molitor); Date: Fri, 13 Mar 1998 04:54:14 +0000; Over the Last thiry years or so, I have designed and/or built literally dozens of power amps, both at home and on the job. These span the range of audio thru L-band, from a pair of 1625's (??) to a m; /archives//html/Amps/1998-03/msg00223.html (9,340 bytes)
2. [AMPS] 4CX1000A advice?? (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 13 Mar 98 04:49:03 -0800; The grid in the 8168/4cx1000A is barely visible to the naked eye. Presumably, when the 0w [sic] grid dissipation rating is grossly exceeded, the tiny grid wires melt. - Because when RF cathode feedb; /archives//html/Amps/1998-03/msg00229.html (11,698 bytes)
3. [AMPS] 4CX1000A advice?? (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Fri, 13 Mar 1998 10:11:17 EST; Larry et al: This may be stale or old-hat information but for what it is worth: I would suggest the superb screen regulator article by our own G3SEK in the October 1997 QEX. I would be skittish about; /archives//html/Amps/1998-03/msg00235.html (9,132 bytes)
4. [AMPS] 4CX1000A advice?? (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Fri, 13 Mar 98 09:39:41 -0600; Ahem....Well said! :-) 73, Jon KE9NA -- Jon Ogden jono@webspun.com www.qsl.net/ke9na "A life lived in fear is a life half lived." -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: am; /archives//html/Amps/1998-03/msg00238.html (8,650 bytes)
5. [AMPS] 4CX1000A advice?? (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 13 Mar 98 08:40:20 -0800; ......... - No hassle HF input circuits dismiss the importance of neutralization. With a grid termination R of 12.5 ohms, no problem With a grid termination R of 50 ohms, maybe no problem. With a gri; /archives//html/Amps/1998-03/msg00241.html (8,938 bytes)
6. [AMPS] 4CX1000A advice?? (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Fri, 13 Mar 1998 17:47:18 EST; Rich, first of all how about adding a few spaces between messages and your replies....some of us older folks might appreciate it. So you already are condemning the Emtron, QRO and even the Alpha amp; /archives//html/Amps/1998-03/msg00251.html (10,533 bytes)
7. [AMPS] 4CX1000A advice?? (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 14 Mar 98 05:44:02 -0800; OK, Carl. I keep forgetting that there are e-mail apps. that don't automatically change the colour of the quoted lines, like Claris E-Mailer does. Unfortunately, they only make a Mac version. - I am; /archives//html/Amps/1998-03/msg00266.html (11,469 bytes)
8. [AMPS] 4CX1000A advice?? (score: 1): Author: wrt@eskimo.com (Bill Turner, W7TI); Date: Sat, 14 Mar 1998 15:19:41 GMT; On Sat, 14 Mar 98 05:44:02 -0800, Rich Measures <measures@vc.net> wrote: _______________________________________________________________ Agent (by Forte) also changes the color of quoted lines. Highl; /archives//html/Amps/1998-03/msg00269.html (8,802 bytes)
9. [AMPS] 4CX1000A advice?? (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Sat, 14 Mar 1998 11:54:58 EST; Add another line or 2 of seperation Rich...please. SNIP Agreed If Emtron, QRO, and Alpha do not use such a circuit, I do not know what they or Alpha use. SNIP Each tube has it's own requirements and; /archives//html/Amps/1998-03/msg00275.html (10,984 bytes)
10. [AMPS] 4CX1000A advice?? (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 14 Mar 1998 19:43:04 +0000; The 91B "absorbs" the input capacitance of the 4CX800As by making it act as C2 in a pi-network. The tube input capacitance is about 100pF total, and the fixed capacitors used for C1 are about the sam; /archives//html/Amps/1998-03/msg00284.html (9,491 bytes)
11. [AMPS] 4CX1000A advice?? (score: 1): Author: w7iuv@axtek.com (Larry Molitor); Date: Sat, 14 Mar 1998 21:56:17 +0000; Many thanks to those who replied to my request for 4CX1000A advice. I now have the info I needed in regard to the question about filament/heater chokes. However, the other question I asked remains pr; /archives//html/Amps/1998-03/msg00291.html (9,295 bytes)
12. [AMPS] 4CX1000A advice?? (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 15 Mar 98 08:05:33 -0800; Hello, Dick tnx. I'll try to get a copy of the roadmap so I can see what this 'simple network' is, Dick. ......... ? . . To anyone on the [AMPS] group who has a circuit diagram for an Emtron, Alpha,; /archives//html/Amps/1998-03/msg00296.html (9,710 bytes)
13. [AMPS] 4CX1000A advice?? (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 15 Mar 98 08:05:37 -0800; No. Any current is obviously not capable of melting the grid wires. My guess is that a few tens of mA for a few seconds would not hurt, despite Eimac's 0w rating. My guesses on the symptoms of grid; /archives//html/Amps/1998-03/msg00297.html (10,345 bytes)
14. [AMPS] 4CX1000A advice?? (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 15 Mar 98 08:05:46 -0800; If the grids are connected directly to ground, how it it possible to deliver grid bias potential to the grids? . No neutralization? . Eimac recommends neutralization. cheers Rich... R. L. Measures,; /archives//html/Amps/1998-03/msg00301.html (9,235 bytes)
15. [AMPS] 4CX1000A advice?? (score: 1): Author: ab4ru@stc.net (Ron Hooper, W4WA); Date: Sun, 15 Mar 1998 16:24:31 +0000; To: <amps@contesting.com> Hi Larry, I have been successful building screen grid tubes in many anps. Unless you have a low drive requirment, I would scrap the idea. The 4cx1000 has little tolerence fo; /archives//html/Amps/1998-03/msg00302.html (10,897 bytes)
16. [AMPS] 4CX1000A advice?? (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 15 Mar 1998 19:57:25 +0000; The usual way, a DC blocking capacitor and RFC. Like I said, at all HF/VHF frequencies, the grids see the 50-ohm resistor connected directly to ground. That's a sweeping over-simplification. 73 from; /archives//html/Amps/1998-03/msg00311.html (8,923 bytes)

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