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1. [Amps] Supply question (score: 1): Author: Michael J Talkington <n8fwd@hotmail.com>; Date: Tue, 19 Jul 2011 20:47:32 -0400; Hello, I am building a single band hf amp. I am using two 3-500Z tubes. The specs for the tubes say 4000 Volts dc max. I keep hearing people volting these tubes in standby above this voltage and when; /archives//html/Amps/2011-07/msg00223.html (6,690 bytes)
2. Re: [Amps] Supply question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 19 Jul 2011 21:14:56 -0400; At that voltage the layout and construction takes a lot of TLC, even on 160. Id suggest 3200-3500V key down for long term reliability. Carl KM1H _______________________________________________ Amps m; /archives//html/Amps/2011-07/msg00224.html (8,438 bytes)
3. Re: [Amps] Supply question (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 19 Jul 2011 21:43:46 -0400; The no load voltage will be no greater than 1.414 X transformer voltage. In your case 3959 volts. I always use a ball park number of 1.25 X transformer voltage for full load voltage. That would give; /archives//html/Amps/2011-07/msg00225.html (8,328 bytes)
4. Re: [Amps] Supply question (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 20 Jul 2011 08:11:27 +0100; That is quite acceptable. Tubes don't mind that. Strictly you are going above the voltage, but I don't think it will harm any tubes. I've seen that written in some data sheets, but I would certainly; /archives//html/Amps/2011-07/msg00227.html (10,311 bytes)
5. Re: [Amps] Supply question (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Wed, 20 Jul 2011 03:54:30 -0400; What's that extra voltage do to the IM Carl? 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-07/msg00228.html (9,042 bytes)
6. Re: [Amps] Supply question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 20 Jul 2011 09:52:55 -0400; Its right on the spec sheet. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-07/msg00229.html (10,326 bytes)
7. Re: [Amps] Supply question (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Wed, 20 Jul 2011 10:15:50 -0500; I understand that with 3-500 the 3rd order IMD gets pretty lousy when the Ep gets up there much above 3 KV. I also had some idea you get a much bigger chance of arcs in the tube if you push the Ep wa; /archives//html/Amps/2011-07/msg00230.html (7,776 bytes)
8. Re: [Amps] Supply question (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Wed, 20 Jul 2011 11:35:55 -0400; Lots of the Henry amps have idled at 4200 and run between 3700 and 3900 under load for years and years. Some of the B&W, amps and the like ran up high. Ameritron is somewhere in between and they all; /archives//html/Amps/2011-07/msg00231.html (8,968 bytes)
9. Re: [Amps] Supply question (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Wed, 20 Jul 2011 11:41:51 -0400; When you run the 3-500 easy, you will have a greater chance of arcs than if you run the cherry red or orange. The gettering material is on the anode and it requires color, sometimes significant color; /archives//html/Amps/2011-07/msg00232.html (8,601 bytes)
10. Re: [Amps] Supply question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 20 Jul 2011 11:58:32 -0400; Read the spec sheet. Very true when gas is involved as the voltage needed to ignite is in inverse proportion. A 4000V amp still outgasses when not regularly used and is more prone to arc when turned; /archives//html/Amps/2011-07/msg00233.html (11,036 bytes)
11. Re: [Amps] Supply question (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 20 Jul 2011 12:01:11 -0400; With 3500 volts @ 890 watts PEP out per tube 3rd order IM products are -40 db with respect to one of two tones. That's -46 db the way radio manufacturers spec IM. Pretty darn good! At 2500 volts 3rd; /archives//html/Amps/2011-07/msg00234.html (9,452 bytes)
12. Re: [Amps] Supply question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 20 Jul 2011 12:37:13 -0400; Thats at zero bias. Add 5.1V as in the SB-220 and its in the low -40's which is what you will actually hear on the air and not equipment manufacturers fudged figures. Carl KM1H ______________________; /archives//html/Amps/2011-07/msg00235.html (10,329 bytes)
13. Re: [Amps] Supply question (score: 1): Author: "kingwood" <k5jv@kingwoodcable.com>; Date: Wed, 20 Jul 2011 13:01:03 -0500; Greetings to all, As I recall, EIMAC' s "Care and Feeding of Power Grid Tubes" says that the getter material, if any at all, is in the cathode (filament) of the tube, not the anode. It is the heating; /archives//html/Amps/2011-07/msg00236.html (9,725 bytes)
14. Re: [Amps] Supply question (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Wed, 20 Jul 2011 11:14:30 -0700; Urban legend and a few old hands have it that the 3-500Z is the exception - the anode has the getter material. Since all the newer-style ceramic triodes most certainly do have the getter in the catho; /archives//html/Amps/2011-07/msg00237.html (10,594 bytes)
15. Re: [Amps] Supply question (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 20 Jul 2011 19:23:54 +0100; In almost every detail, that is flat-out WRONG. The AMPS archives contain plenty of accurate information on the subject of getters. Simply go to <http://lists.contesting.com/archives//html/Amps/> and; /archives//html/Amps/2011-07/msg00238.html (9,856 bytes)
16. Re: [Amps] Supply question (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Wed, 20 Jul 2011 14:37:47 -0400; I don't think the information is current as it relates to what is on the market now. Everyone may correct me if I am wrong, but I believe the current and recently past tubes have a zirconium flake on; /archives//html/Amps/2011-07/msg00239.html (10,303 bytes)
17. Re: [Amps] Supply question (score: 1): Author: Réjean Léveillé <releveille@videotron.ca>; Date: Wed, 20 Jul 2011 16:19:06 -0400; Hi Mike As example I am using 2x 3-500 tubes and the HV transformer is 3 kv / 1 A with a full bridge without a load it reaches around 3800 V, with the bleeder resistors 2x 50 kohms/100w + 100 ohms/7w; /archives//html/Amps/2011-07/msg00242.html (10,557 bytes)
18. Re: [Amps] Supply question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 20 Jul 2011 18:58:23 -0400; Thank you Ian for stepping in and correcting the myths surrounding these tubes. And Measures is still in dreamland spouting off about parasitics and bent filaments. Some things never change but thank; /archives//html/Amps/2011-07/msg00244.html (10,631 bytes)
19. Re: [Amps] Supply question (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Wed, 20 Jul 2011 20:36:11 -0500; Thanks for all the answers. Gettering an unknown condx tube at 1 KV sounds like a good idea--I had some idea of doing that but wasn't exactly sure what plate v. to use. Whenever I run my 3-500zg they; /archives//html/Amps/2011-07/msg00246.html (8,658 bytes)
20. Re: [Amps] Supply question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 21 Jul 2011 11:10:28 -0400; Anything around 1000V is fine as it wont sustain an arc. Apply enough positive bias to get the Pd up to a nice dull orange for 10-15 minutes twice a year for the spares or unused amp. Its a lot easie; /archives//html/Amps/2011-07/msg00248.html (11,064 bytes)

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