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1. [AMPS] 4CX1500B (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Sat, 05 May 2001 18:29:57 -0600; Have a friend who needs an Eimac 4CX1500B for his amp. He might be willing to buy a second one for a spare if the price is right. Just wonder who deals in surplus 4CX1500Bs, has good prices, and good; /archives//html/Amps/2001-05/msg00064.html (7,122 bytes)
2. [AMPS] 4CX1500B (score: 1): Author: n4kw@citrus.infi.net (Pete Raymond); Date: Sun, 06 May 2001 09:31:19 -0400; John, I am in the process of building a linear using a 4cx1500b also and would like to exchange info with your friend if possible. I have a couple of new tubes but would not give one up untill I have; /archives//html/Amps/2001-05/msg00069.html (7,873 bytes)
3. [AMPS] 4CX1500B (score: 1): Author: 2@vc.net (measures); Date: Sun, 6 May 2001 06:58:59 -0700; ? If one uses the Eimac recommended I-limiting shunt type screen-regulator, a glitch R in the B+, and adjusts the grid bias V so that no more than c. 100uA of grid-I flows under max. drive, there is; /archives//html/Amps/2001-05/msg00070.html (8,278 bytes)
4. [AMPS] 4CX1500B (score: 1): Author: vk6apk@eon.net.au (Alek Petkovic); Date: Mon, 08 Nov 1999 20:52:49 +0800; For Sale: NEW in sealed bag, 4CX1500B. Date Code 7233. Yes that's right 7233. $200.00 + $30.00 Shipping/Insurance. Mail me direct. 73 de Alek VK6APK -- FAQ on WWW: http://www.contesting.com/ampsfaq.h; /archives//html/Amps/1999-11/msg00207.html (6,583 bytes)
5. [AMPS] 4CX1500B (score: 1): Author: vq9jt@cwnetdg.io (Tarrant David); Date: Tue, 12 Jan 1999 07:25:32 +0800; Hello, I am in the process of putting together a 4CX1500 amp. Any input to the following would be greatly appreciated? 1. Antenna switching ... Vacuum relays Vs pin diodes 2. Full break-in keying 3.; /archives//html/Amps/1999-01/msg00156.html (6,825 bytes)
6. [AMPS] 4CX1500B (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 12 Jan 1999 07:05:50 -0800; ? PIN diodes allow 100wpm cw. Vacuum relays can go about 35wpm or so. Vacuum relays are simpler to use and they are less susceptible to damage from high-swr and electrostatic discharges in the near; /archives//html/Amps/1999-01/msg00158.html (8,254 bytes)
7. [AMPS] 4CX1500B (score: 1): Author: johnf@futurenet.co.za (John Fielding); Date: Tue, 12 Jan 1999 19:01:11 +0200; Pin diodes are great for rf switching at the kW level. However, they have a few shortcomings due to the circuitry you need around them to make them work. The biggest problem is the rf chokes which ar; /archives//html/Amps/1999-01/msg00159.html (8,498 bytes)
8. [Amps] 4CX1500B (score: 1): Author: "robert briggs" <vk3zl@bigpond.com>; Date: Wed, 21 Sep 2005 16:25:26 +1000; This one may have been asked before.Over the past few years I have constructed a few amplifiers using pairs of 4CX250/350B tubes in Super Cathode Driven Mode,The Screen Grid grounded and the Control; /archives//html/Amps/2005-09/msg00251.html (6,708 bytes)
9. Re: [Amps] 4CX1500B (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 21 Sep 2005 04:53:33 -0700; Yes, provided you need an amplification of c. 5x. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2005-09/msg00257.html (7,423 bytes)
10. Re: [Amps] 4CX1500B (score: 1): Author: "Carcia, Francis A HS" <francis.carcia@hs.utc.com>; Date: Wed, 21 Sep 2005 08:24:48 -0400; 4CX1500B works great in a 30S1 which I think is the same configuration gfz This one may have been asked before.Over the past few years I have constructed a few amplifiers using pairs of 4CX250/350B t; /archives//html/Amps/2005-09/msg00259.html (8,254 bytes)
11. Re: [Amps] 4CX1500B (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Wed, 21 Sep 2005 05:37:45 -0700; "4CX1500B works great in a 30S1 which I think is the same configuration gfz" No, not same configuration. The 30S1 used conventional cathode drive, with control grid and screen grid operating on corre; /archives//html/Amps/2005-09/msg00260.html (7,736 bytes)
12. Re: [Amps] 4CX1500B (score: 1): Author: "Carcia, Francis A HS" <francis.carcia@hs.utc.com>; Date: Wed, 21 Sep 2005 08:48:57 -0400; OK you now have my attention since I drive the 4CX3000A. What happens to the resting current when the G1 is connected to the cathode. Also what happens to the gain compared to both grids at ground. M; /archives//html/Amps/2005-09/msg00261.html (7,874 bytes)
13. Re: [Amps] 4CX1500B (score: 1): Author: Patrick Egloff <pegloff@gmail.com>; Date: Wed, 21 Sep 2005 15:28:54 +0200; Hi Robert, I'm not very aware about this type of setup, but the 4CX1500B has a 1W max grid dissipation, so you could quickly burn it when exiting it too much. On the other hand, the 4CX250B has only; /archives//html/Amps/2005-09/msg00263.html (9,086 bytes)
14. Re: [Amps] 4CX1500B (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 21 Sep 2005 11:43:03 -0700; In super-cathode driven config, there is never any grid-I or grid-diss. because the grid-cathode potential is always zero. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _____________________; /archives//html/Amps/2005-09/msg00271.html (9,817 bytes)
15. [Amps] 4CX1500B (score: 1): Author: "robert briggs" <vk3zl@bigpond.com>; Date: Thu, 22 Sep 2005 08:28:53 +1000; I have received several query's about the Super Cathode Drive method on my 4CX250 B amplifiers. The amplifier's take around 100 watts of drive power for 600 watts output. When the drive input is corr; /archives//html/Amps/2005-09/msg00274.html (7,629 bytes)
16. Re: [Amps] 4CX1500B (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 22 Sep 2005 07:22:07 -0700; The main tool needed to measure total IMD is a second SSB receiver -- preferably one with a double-filter -- tuned c. 4KHz above or below the signal being measured. The 4cx1500B already has low IMD i; /archives//html/Amps/2005-09/msg00288.html (8,812 bytes)
17. Re: [Amps] 4CX1500B (score: 1): Author: "Carcia, Francis A HS" <francis.carcia@hs.utc.com>; Date: Thu, 22 Sep 2005 10:26:06 -0400; You also need a good step attenuator in line with the second receiver input because most receiver S meters are bogus. The only one I have ever seen that has any kind of calibrated scale is a good wor; /archives//html/Amps/2005-09/msg00289.html (9,427 bytes)
18. Re: [Amps] 4CX1500B (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 22 Sep 2005 10:23:22 -0700; With 0db attenuation, take the S meter reading at the adjacent frequency, tune to the fundamental frequency, add attenuation as needed to give the same S-meter reading as before. The # of db of atten; /archives//html/Amps/2005-09/msg00290.html (10,742 bytes)
19. Re: [Amps] 4CX1500B (score: 1): Author: "m.ford" <k1ern@direcway.com>; Date: Thu, 22 Sep 2005 13:42:58 -0400; Ok, so we are using the same meter for both measurements and at the same level of meter deflection. The actual measurement is taken from the step attennuator therefore the quality of the S meter has; /archives//html/Amps/2005-09/msg00291.html (10,423 bytes)
20. Re: [Amps] 4CX1500B (score: 1): Author: "Carcia, Francis A HS" <francis.carcia@hs.utc.com>; Date: Thu, 22 Sep 2005 14:02:21 -0400; So both numbers will be bogus. S meters do not give accurate numbers in DB. You will only have better than worse than results with no standard as a reference. Ok, so we are using the same meter for b; /archives//html/Amps/2005-09/msg00292.html (11,306 bytes)

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