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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+833A\/GU\-48\s+x4\s+Amp\s+support\s*$/: 20 ]

Total 20 documents matching your query.

1. [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>
Date: Sat, 25 Feb 2012 22:00:29 +0000
Hi all, I am not an amps expert but I am thinking to build an amplifier using 4 x GU-48. I guess GU-48 is equivalent to 833A, not sur if all specs are same. This is trying to get an amp "looking beau
/archives//html/Amps/2012-02/msg00268.html (7,450 bytes)

2. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 26 Feb 2012 14:59:34 -0600
833As are supposed to get squirrely (that is American for unstable) above 40 m. if I am not mistaken. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com
/archives//html/Amps/2012-02/msg00269.html (8,671 bytes)

3. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Mon, 27 Feb 2012 05:11:52 +0800
I don't think 833A is a good option.As it have long electrode and bad freqence response. I'm afraid it can not work in 20m in 4X parallel(self-oscillation). 3CX3000A7/F7 is better. But if you use ACO
/archives//html/Amps/2012-02/msg00270.html (8,462 bytes)

4. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Mon, 27 Feb 2012 03:03:03 -0500
I believe he wants 4 glowing plates. Larger the better. 4x 250th would work but a bit expensive compared to the Russan 833. I once ran 2x 250th in grounded grid driven by a pair of 6146Bs on 20 meter
/archives//html/Amps/2012-02/msg00275.html (9,477 bytes)

5. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Mon, 27 Feb 2012 10:06:41 -0500
A pair of 6C21's will do a nice job also. Use 7.5V on the filaments and with some healthy air fow you can use 1000T specs. With just a muffin fan treat them as a 450TL. If you want the ultimate glow
/archives//html/Amps/2012-02/msg00279.html (12,075 bytes)

6. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Mon, 27 Feb 2012 12:12:57 -0500
I like the 304TL eventought the gain is low. In fact 4 of them should run very linear in class AB1 operation with no grid current yet provide more than legal limit output for USA. 73 Bill wa4lav A pa
/archives//html/Amps/2012-02/msg00283.html (13,321 bytes)

7. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Mon, 27 Feb 2012 12:22:38 -0500
Oh, in AB1 all the drive power will go to the output as well. That is the plan for my 4x 4CX250B amplifier with grounded screen and control grid connected to cathode. Driven by another 4CX250B with s
/archives//html/Amps/2012-02/msg00285.html (13,795 bytes)

8. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Mon, 27 Feb 2012 14:38:05 -0500
In grid driven AB1 there better not be any drive power unless its swamped grid. I was talking about AB2 or B GG. Not sure what the linearity would be like. Carl KM1H -- Original Message -- From: "Fuq
/archives//html/Amps/2012-02/msg00288.html (14,338 bytes)

9. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 27 Feb 2012 15:34:46 -0500
The GU-81 is, or was, very popular in Europe, particularly running a pair of them. I think you'll find it's a Pentode, not a Tetrode. Of course it still requires the same power supplies as a Tetrode
/archives//html/Amps/2012-02/msg00294.html (9,754 bytes)

10. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Mon, 27 Feb 2012 16:08:01 -0500
My vote is for the GU-81 grounded grid. Looks like folks have been runing them that way. Where can I get some cheap? Sounds like a good project. 73 Bill wa4lav The GU-81 is, or was, very popular in E
/archives//html/Amps/2012-02/msg00295.html (11,015 bytes)

11. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Mon, 27 Feb 2012 16:45:32 -0500
Tubes are cheap but not even my son who travels all over Eastern Europe cant find cheap sockets. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http:/
/archives//html/Amps/2012-02/msg00299.html (12,166 bytes)

12. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Tue, 28 Feb 2012 06:24:10 +0800
$35 is inexpensive? Tubes are cheap but not even my son who travels all over Eastern Europe cant find cheap sockets. Carl KM1H _______________________________________________ Amps mailing list Amps@c
/archives//html/Amps/2012-02/msg00301.html (12,469 bytes)

13. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Mon, 27 Feb 2012 18:01:21 -0500
Sockets that cost 2X the tube are ridiculous, especially Russian surplus. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m
/archives//html/Amps/2012-02/msg00302.html (14,024 bytes)

14. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 27 Feb 2012 17:16:35 -0600
Then there's fixed vacuum cap mounting hardware--unbelievable. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi
/archives//html/Amps/2012-02/msg00303.html (8,829 bytes)

15. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Tue, 28 Feb 2012 07:30:51 +0800
I've order some fixed vacuum cap mounting hardwares for myself. order from workshop direct,accordind my design, very inexpensive. Then there's fixed vacuum cap mounting hardware--unbelievable. Rob K5
/archives//html/Amps/2012-02/msg00305.html (9,369 bytes)

16. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Tue, 28 Feb 2012 08:03:44 +0800
I live nearby one of FU-81's(Chinese GU-81M) maunfacturer, the distance only 300 mtrs , they made FU-81 in end of 1950s or early 1960s. Stop in 1980s. all materials /dies are missed . In 1990s , a bu
/archives//html/Amps/2012-02/msg00306.html (14,829 bytes)

17. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Date: Mon, 27 Feb 2012 21:48:12 -0500
I would make my own sockets. Have done it before using spring clips from other sockets and some G10. _______________________________________________ Amps mailing list Amps@contesting.com http://lists
/archives//html/Amps/2012-02/msg00310.html (8,515 bytes)

18. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Mon, 27 Feb 2012 22:11:12 -0500
With the heat that envelope is capable of reaching Id likely have a stress crack the first day. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://
/archives//html/Amps/2012-02/msg00311.html (9,609 bytes)

19. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 28 Feb 2012 07:45:41 +0000
American surplus too! But it's only to be expected, because far fewer sockets have ever been manufactured compared with the numbers of tubes. A commercial amplifier may use several replacement tubes
/archives//html/Amps/2012-02/msg00313.html (8,963 bytes)

20. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Tue, 28 Feb 2012 10:34:28 -0500
Agree Ian but there do seem to be dealers in Eastern EU with large quantities of GU-81M sockets, new and used. Maybe its become an audiophool tube. It certainly hasnt reached the extremes of some Eim
/archives//html/Amps/2012-02/msg00315.html (9,595 bytes)

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