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1. [Amps] 1625 (score: 1): Author: "Edwin Karl" <edk0kl@centurytel.net>; Date: Wed, 11 Feb 2009 15:05:47 -0600; As I recall, having built one of those amps way in the before time, Sylvania and National Untion brought the beam forming electrode out to the base. Apparently others manufactured the tubes with inte; /archives//html/Amps/2009-02/msg00335.html (6,405 bytes)
2. Re: [Amps] 1625 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 11 Feb 2009 19:37:19 -0500; I still have 4 of those tubes with slices in the bakelite where the surgery was performed. They were driven by a 20A to some unknown output power on 80-20M. I believe it was P&H who offered a commerc; /archives//html/Amps/2009-02/msg00342.html (7,527 bytes)
3. Re: [Amps] 1625 (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Thu, 12 Feb 2009 09:00:21 -0800 (PST); The P&H 400 series amplifiers could be ordered with either modified 1625 tubes or 837 tubes. The "Four In Line" was the ARRL's version of the grounded grid amplifiers using 1625 tubes. That amplifier; /archives//html/Amps/2009-02/msg00361.html (7,987 bytes)
4. Re: [Amps] 1625 (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 12 Feb 2009 12:22:06 -0500; The "four in line" was four 1625s mounted in line that were grid driven in push pull parallel arrangement. Each side of the push pull circuit had two tubes in parallel. Getting old when you remember; /archives//html/Amps/2009-02/msg00364.html (9,301 bytes)
5. Re: [Amps] 1625 (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Thu, 12 Feb 2009 09:30:46 -0800 (PST); I pulled my original SSB Manual and you are correct, the original "Four In Line" was grid driven. There was an article in QST in the late 1950s or early 1960s that told how to convert this linear (or; /archives//html/Amps/2009-02/msg00367.html (8,282 bytes)
6. Re: [Amps] 1625 (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 12 Feb 2009 12:40:03 -0500; I remember an article for a grounded grid amp with four 1625s that used the antenna roller coil from a command set as the tank coil. No cathode choke as it was intended to be use with an exciter with; /archives//html/Amps/2009-02/msg00369.html (9,734 bytes)
7. Re: [Amps] 1625 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 12 Feb 2009 14:45:59 -0500; I believe that CQ carried the initial article and showed 6AG7's, 837's and modified 1625's. Id say late 50's or early 60's also. Looking thru some notes, I try to never throw things away, packed with; /archives//html/Amps/2009-02/msg00375.html (9,484 bytes)
8. Re: [Amps] 1625 (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Thu, 12 Feb 2009 14:12:02 -0800 (GMT-08:00); I built an amp using 4 x 6AG7 tubes. Ran 1000 volts on the plates and my 200 ma plate meter pinned when I talked, so I did not know how much current I was running. I have no idea if the plates got re; /archives//html/Amps/2009-02/msg00381.html (8,065 bytes)
9. Re: [Amps] 1625 (score: 1): Author: "Rex Lint" <rex@lint.mv.com>; Date: Thu, 12 Feb 2009 18:03:23 -0500; Whew! The max rating for a 6AG7 is 300 V, so you ran them at 3.3 the max voltage! It must be one tough tube. The plate dissapation is 9 watts, so 4*9 = 36 watts, and if you pegged the 200 ma meter, t; /archives//html/Amps/2009-02/msg00384.html (9,521 bytes)
10. Re: [Amps] 1625 (score: 1): Author: "Paul Kraemer" <elespe@lisco.com>; Date: Thu, 12 Feb 2009 17:09:03 -0600; Colin Did you burn the paint off the 6AG7's? That was the true power output indicator. I think you needed the extra drive from 20A for that level. My coach from the beginner days gave me 6CL6 pulls f; /archives//html/Amps/2009-02/msg00385.html (9,445 bytes)
11. Re: [Amps] 1625 (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Thu, 12 Feb 2009 15:19:11 -0800 (PST); The "olde tymers" used to tell me of running like 1000 volts on the plate of a 6L6. According to them, you had to send code pretty fast because a short "dash" turned the plate red and a long "dash" m; /archives//html/Amps/2009-02/msg00387.html (8,783 bytes)
12. Re: [Amps] 1625 (score: 1): Author: "Paul Kraemer" <elespe@lisco.com>; Date: Thu, 12 Feb 2009 17:30:34 -0600; We musta been a rebelious crowd Glen Look at what WRL used on the plates of the EL34's in a LA-1 linear to get 400 watts PH kind of same way calling (4) 1625's an 800 watt linear. That was no small h; /archives//html/Amps/2009-02/msg00388.html (9,707 bytes)
13. Re: [Amps] 1625 (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Thu, 12 Feb 2009 16:41:28 -0800; "The max rating for a 6AG7 is 300 V, so you ran them at 3.3 the max voltage! It must be one tough tube. The plate dissapation is 9 watts" The maximum plate voltage for the 6AG7 in grid driven configu; /archives//html/Amps/2009-02/msg00389.html (9,691 bytes)
14. Re: [Amps] 1625 (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 12 Feb 2009 15:53:45 -0500; Many years ago when I had a 10A I used 4 6AG7s in G-G runing 1100 Volts on the plate. Got about 300watts plate input power. I had them pressed into 1" holes in an aluminum block fins cut in it using; /archives//html/Amps/2009-02/msg00392.html (12,266 bytes)
15. Re: [Amps] 1625 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 12 Feb 2009 20:20:36 -0500; And when you were able to afford real tubes the 813's took 3KV without complaint. Many are now running them on AM at that voltage but I wimped out at 2500 with the 4 holer. Carl KM1H ________________; /archives//html/Amps/2009-02/msg00394.html (11,460 bytes)
16. Re: [Amps] 1625 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 12 Feb 2009 20:26:46 -0500; Do it with 5763's and take plenty of pix! Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-02/msg00395.html (8,504 bytes)
17. Re: [Amps] 1625 (score: 1): Author: "jos hermans" <on4kj@skynet.be>; Date: Fri, 13 Feb 2009 12:31:19 +0100; Hello Old Timers, Someone forgot to talk about the 2E29 832 and the 829 completed with the 4x150A VHF, but they did a good job on HF too. An other way to be a HAM.....60 years ago!! Jos on4kj --Messa; /archives//html/Amps/2009-02/msg00426.html (13,031 bytes)

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