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Total 22 documents matching your query.

1. [Amps] 3-400Z vs. 4-400A (score: 1): Author: ko4nrbs@yahoo.com (Bill Smith); Date: Fri, 5 Jul 2002 07:55:54 -0700 (PDT); Some time ago a guy told me he was substituting the 4-400A tube in his Swan Mark 1 amplifier instead of using the 3-400Z tube. He had a large supply of the 4-400A tubes on hand and said they were wor; /archives//html/Amps/2002-07/msg00069.html (7,679 bytes)
2. [Amps] 3-400Z vs. 4-400A (score: 1): Author: W0YR@aol.com (W0YR@aol.com); Date: Fri, 5 Jul 2002 12:12:14 EDT; If the tube sockets are wired correctly (and I think they are in this case) you should just be able to plug in the 4-400-s and GO! They will take more drive than the 3-400's required but will work gr; /archives//html/Amps/2002-07/msg00070.html (7,698 bytes)
3. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 5 Jul 2002 11:42:56 -0700; In g-g, at 0v bias, the 4-400A needs c. 3400V to idle at the requisite 75mA. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-07/msg00072.html (7,919 bytes)
4. [Amps] 3-400Z vs. 4-400A (score: 1): Author: wwd@netheaven.com (wwd@netheaven.com); Date: Fri, 05 Jul 2002 16:44:45 -0400; So add some bias already. <g> -- wwd ~~~~~~~~~~~~~~~~~~`; /archives//html/Amps/2002-07/msg00073.html (8,296 bytes)
5. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 5 Jul 2002 18:13:31 -0700; Adding bias to raise the ZSAC to 75mA/tube with 3000VDC would require connecting a 1A, 1 - 3 volt neg. polarity PS to the CT/cathode return. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.; /archives//html/Amps/2002-07/msg00075.html (8,560 bytes)
6. [Amps] 3-400Z vs. 4-400A (score: 1): Author: W0YR@aol.com (W0YR@aol.com); Date: Sat, 6 Jul 2002 09:24:15 EDT; Think about it. The Swan amps don't furnish ANYWHERE NEAR 3,400 Volts B+. Why even bother to point out the bias requirements of a 4-400 operating in GG with 3,400 volts on the plate? Unless, of cours; /archives//html/Amps/2002-07/msg00076.html (8,064 bytes)
7. [Amps] 3-400Z vs. 4-400A (score: 1): Author: wwd@netheaven.com (wwd@netheaven.com); Date: Sat, 06 Jul 2002 10:29:37 -0400; [grumble-grouse] . . . Oh, I see, a trivial task. -- wwd K2AME ~~~~~~~~~~~~; /archives//html/Amps/2002-07/msg00077.html (8,961 bytes)
8. [Amps] 3-400Z vs. 4-400A (score: 1): Author: ku7i@hotmail.com (Lane Zeitler); Date: Sat, 06 Jul 2002 08:16:36 -0700; To: <amps@contesting.com> Huh?? Rich's answers can be vague, most likely with the intent to tease. Sometimes you have to 'read' into his responses. Lane Ku7i ________________________________________; /archives//html/Amps/2002-07/msg00078.html (9,394 bytes)
9. [Amps] 3-400Z vs. 4-400A (score: 1): Author: k7rdx@earthlink.net (k7rdx); Date: Sat, 6 Jul 2002 08:50:22 -0700; And you must also realize that if he can`t dazzle you with his brilliance,he will baffle you with his bull...t. Jim. -- Original Message -- From: Lane Zeitler <ku7i@hotmail.com> To: <W0YR@aol.com>; <; /archives//html/Amps/2002-07/msg00080.html (10,500 bytes)
10. [Amps] 3-400Z vs. 4-400A (score: 1): Author: alex@mail.sandlabs.com (alex); Date: Sat, 6 Jul 2002 11:54:17 -0400; I know :) Been there, done that :):):) Alex To: <amps@contesting.com>; /archives//html/Amps/2002-07/msg00082.html (11,784 bytes)
11. [Amps] 3-400Z vs. 4-400A (score: 1): Author: nospam4me@juno.com (skipp isaham); Date: Sat, 6 Jul 2002 09:28:19 -0700; [cut and paste] - Because other options are open season... One might judge the value of a Dahl retrofit xfmr. Some vintage Henry amps (with excessive filament and Anode values) arrived with 3-400z's; /archives//html/Amps/2002-07/msg00083.html (11,098 bytes)
12. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 10:39:48 -0700; If I were going to the trouble, I would add c. a potted 200V/1A transformer in series with the extant secondary. This would add enough DCV to make it fly with zero V bias. - R. L. Measures, a.k.a. R; /archives//html/Amps/2002-07/msg00084.html (9,492 bytes)
13. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 10:39:52 -0700; Those who spread Bandini around rose bushess can expect larger blooms. Those who spread it here can expect to be marginalized quite soon. To: <amps@contesting.com> - R. L. Measures, a.k.a. Rich..., 8; /archives//html/Amps/2002-07/msg00085.html (11,017 bytes)
14. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 10:39:50 -0700; To: <amps@contesting.com> Such has been known to occasionally happen. I try to promote the idea of bipedal mammals using their own horse sense. cheers, Lane - R. L. Measures, a.k.a. Rich..., 805.386; /archives//html/Amps/2002-07/msg00086.html (9,193 bytes)
15. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 10:39:54 -0700; * More gain is obtained with DC screen V applied only if the RF driving signal is applied between the control grid and the screen grid. With both grids at RF-ground and the cathode driven, this does; /archives//html/Amps/2002-07/msg00087.html (12,082 bytes)
16. [Amps] 3-400Z vs. 4-400A (score: 1): Author: W0YR@aol.com (W0YR@aol.com); Date: Sat, 6 Jul 2002 17:47:00 EDT; Boy, am I chastised or what? Lighten up.; /archives//html/Amps/2002-07/msg00092.html (7,668 bytes)
17. [Amps] 3-400Z vs. 4-400A (score: 1): Author: yd0lzh@myrealbox.com (YD0LZH); Date: Sun, 7 Jul 2002 05:12:39 +0700; My experiance with with 3-500Z (older brother of 3-400Z) I was plug 4-250A on TL-922 (g1 and g2 shortened). It's works but when you run more drive, plate lilttle bit red With 40-50 watt drive with SS; /archives//html/Amps/2002-07/msg00093.html (7,849 bytes)
18. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 6 Jul 2002 16:15:08 -0700; Tantalum plates normally show color when they are at work. What was the Zero-Signal Anode-Current [ZSAC] with the 4-250A's, Firson? thanks - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vc; /archives//html/Amps/2002-07/msg00095.html (8,003 bytes)
19. [Amps] 3-400Z vs. 4-400A (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 7 Jul 2002 10:39:46 -0400; Better get a new plate tuning capacitor and a new bandswitch while you are getting the new transformer...because the old components won't take an increase in voltage. Watch the little fixed caps and; /archives//html/Amps/2002-07/msg00102.html (10,151 bytes)
20. [Amps] 3-400Z vs. 4-400A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 7 Jul 2002 12:15:07 -0700; As I recall, the Tune-Caps appear to be identical between the 2k-4 and the 3k-A, which uses a higher DC supply voltage. There can be no screen-grid amplification unless the AC driving potential exis; /archives//html/Amps/2002-07/msg00106.html (9,114 bytes)

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