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1. [Amps] 8877 plate voltage (score: 1): Author: Rick Stealey <rstealey@hotmail.com>; Date: Thu, 15 Nov 2007 14:34:24 +0000; I have just no-load tested my homebrew power supply for my 8877 amp. The transformer is rated 2900 volts at 1 amp. I am getting 4200 volts with just bleeder load on it. This is above the maximum rati; /archives//html/Amps/2007-11/msg00203.html (7,432 bytes)
2. Re: [Amps] 8877 plate voltage (score: 1): Author: "Barrie Smith" <barrie@centric.net>; Date: Thu, 15 Nov 2007 11:21:19 -0700; Rick: I run my HB 8877 6M amp at 4200 volts, which drops to 3800 volts under load. No problems in several years. Rumors abound regarding fellows who are running 5 KV, and more, on 8877s. 73, Barrie,; /archives//html/Amps/2007-11/msg00208.html (7,075 bytes)
3. Re: [Amps] 8877 plate voltage (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 15 Nov 2007 13:45:02 -0500; An 8877 will hi pot well over 10KV so that standing voltage is no problem. However operating at more than 4KV is asking for problems as many have found out. We get into uncharted territory of instabi; /archives//html/Amps/2007-11/msg00209.html (7,782 bytes)
4. Re: [Amps] 8877 plate voltage (score: 1): Author: Robert Morris <robrk@nidhog.net>; Date: Thu, 15 Nov 2007 18:25:47 -0500; I'm to lazy to do the math that says, 200 volts in 4000 is probably beyond the tolerance of your meter. The '77 will be very happy with what you have, keeping the grid current nice and low. -- This m; /archives//html/Amps/2007-11/msg00213.html (9,060 bytes)
5. [Amps] 8877 Plate Voltage (score: 1): Author: Charles Bibb <zedkay@telepak.net>; Date: Sat, 30 Jun 2012 16:33:23 -0500; Starting a new project. I'm collecting parts for a new HB 8877 amp. One really nice part that I've recently acquired is a massive transformer for the HV supply. This transformer came out of a commerc; /archives//html/Amps/2012-06/msg00448.html (7,535 bytes)
6. Re: [Amps] 8877 Plate Voltage (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 30 Jun 2012 18:48:09 -0400; Since the 8877 is rated to 3000V in Class C AM service I wouldnt worry about 4200V or so in standby as long as its a known good tube that has been tested at over 3KV. The problem at over 3500V in ope; /archives//html/Amps/2012-06/msg00454.html (9,686 bytes)
7. Re: [Amps] 8877 Plate Voltage (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Sat, 30 Jun 2012 15:50:00 -0700; It will be VERY EASY to drive at this voltage. Probably around 25 watts for 1500 out if its a good tube. I'm thinking of putting a 3 or 4 dB attenuator into the input to get the drive up to around 70; /archives//html/Amps/2012-06/msg00455.html (8,563 bytes)
8. [Amps] 8877 Plate Voltage (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sun, 1 Jul 2012 06:01:11 -0700; Starting a new project. I'm collecting parts for a new HB 8877 amp. One really nice part that I've recently acquired is a massive transformer for the HV supply. This transformer came out of a commerc; /archives//html/Amps/2012-07/msg00001.html (7,728 bytes)
9. Re: [Amps] 8877 Plate Voltage (score: 1): Author: Charles Bibb <zedkay@telepak.net>; Date: Sun, 01 Jul 2012 09:10:21 -0500; Thanks, guys for all the responses. Consensus is: 4150VDC on the anode will not be a problem - key up, or key down. I have noted all the other precautions mentioned as well. 73, Charles - K5ZK ______; /archives//html/Amps/2012-07/msg00002.html (7,091 bytes)
10. Re: [Amps] 8877 Plate Voltage (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Sun, 1 Jul 2012 07:16:44 -0700; I dont use a suppressor. But I do use the Eimac socket and good shielding. My 8877 is perfectly stable at 4100V. See: http://s900.photobucket.com/albums/ac206/w7ry/8877%20Amplifier/ 73 Jim W7RY Start; /archives//html/Amps/2012-07/msg00003.html (9,007 bytes)
11. Re: [Amps] 8877 Plate Voltage (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 1 Jul 2012 11:32:01 -0400; All it takes is a single parasitic to toast things. I believe in minimizing that possibility no matter how small. Carl KM1H _______________________________________________ Amps mailing list Amps@cont; /archives//html/Amps/2012-07/msg00004.html (10,679 bytes)
12. Re: [Amps] 8877 Plate Voltage (score: 1): Author: Steve Bookout <steve@dx4win.com>; Date: Sun, 1 Jul 2012 15:20:04 -0400; I second that! I've been running one @4200, or so, since '85 with no issues. 22 watts in gives me 1500 out. A 3 db pad sure would make it less touchy, when tuning. 73 de Steve, NR4M _________________; /archives//html/Amps/2012-07/msg00005.html (9,481 bytes)
13. [Amps] 8877 Plate Voltage (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 2 Jul 2012 19:03:42 -0700; I second that! I've been running one @4200, or so, since '85 with no issues. 22 watts in gives me 1500 out. A 3 db pad sure would make it less touchy, when tuning. glitch R. . 73 de Steve, NR4M I hea; /archives//html/Amps/2012-07/msg00006.html (8,123 bytes)
14. Re: [Amps] 8877 Plate Voltage (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 2 Jul 2012 22:09:34 -0400; You can also put the pad right at the cathode and get the benefit of some NFB. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.; /archives//html/Amps/2012-07/msg00007.html (8,904 bytes)
15. Re: [Amps] 8877 Plate Voltage (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Mon, 02 Jul 2012 19:32:39 -0700; REPLY: That is not negative feed back. It is simply attenuation. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm; /archives//html/Amps/2012-07/msg00009.html (7,831 bytes)
16. Re: [Amps] 8877 Plate Voltage (score: 1): Author: Mike Tubby <mike@tubby.org>; Date: Tue, 03 Jul 2012 12:59:29 +0100; I think that if you put a resistor in *series* with the cathode circuit (rather than an attenuator) this would provide NFB... Mike G8TIC _______________________________________________ Amps mailing l; /archives//html/Amps/2012-07/msg00014.html (8,226 bytes)
17. Re: [Amps] 8877 Plate Voltage (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 3 Jul 2012 09:00:13 -0400; Which is what I meant, I used "pad" in a very generic way which seemed to confuse someone. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists; /archives//html/Amps/2012-07/msg00016.html (8,942 bytes)
18. Re: [Amps] 8877 Plate Voltage (score: 1): Author: donroden@hiwaay.net; Date: Tue, 03 Jul 2012 09:44:03 -0500; Properly designed, you will have both...... Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-07/msg00020.html (8,218 bytes)
19. Re: [Amps] 8877 Plate Voltage (score: 1): Author: Mike Tubby <mike@tubby.org>; Date: Tue, 03 Jul 2012 19:19:33 +0100; Don, Agreed, I have a single 3-500Z on 6m (very good design from QST 1971) but it had a bit too much gain with 3600V on the tube, so I put 3 x 22R 3W MOF resistor in parallel (giving about 7R at 9W); /archives//html/Amps/2012-07/msg00021.html (9,283 bytes)
20. Re: [Amps] 8877 Plate Voltage (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Tue, 3 Jul 2012 15:25:07 -0700 (PDT); ** I did this with a multi-tube amp running grounded grid. One resistor per tube. It quieted down the current hogs and encouraged the shy ones :). - Jerry Kaidor, KF6VB _____________________________; /archives//html/Amps/2012-07/msg00025.html (8,844 bytes)

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