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1. Topband: 8877 Tube (score: 1): Author: "Chortek, Robert L" <Robert.Chortek@berliner.com>; Date: Wed, 14 Nov 2012 23:56:42 +0000; Wonder if someone can help with a technical question with the amp I use on 160 meters. The Spec Sheet for the 8877 tube lists the "Absolute Maximum Plate Voltage of 4000 Volts" for the tube, and also; /archives//html/Topband/2012-11/msg00206.html (6,892 bytes)
2. Re: Topband: 8877 Tube (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 14 Nov 2012 19:23:04 -0500; Bob, A non-issue. Many of us have been running 8877s with Ep of 4KV. For example, the typical no-load Ep of an Alpha 77Dx/Sx amp is right at the specified limit of 4KV. Some owners have been converti; /archives//html/Topband/2012-11/msg00207.html (8,126 bytes)
3. Re: Topband: 8877 Tube (score: 1): Author: HAROLD SMITH JR <w0rihps@sbcglobal.net>; Date: Wed, 14 Nov 2012 17:10:52 -0800 (PST); Bob and Paul, The 8877 has a 5 volt filament. The 3CPX1500A7 has a 5.5 volt filament. Many have been running the 8877 and 3CPX1500A7 with a Peter Dahl transformer at over 4kV and they work fine. Eima; /archives//html/Topband/2012-11/msg00209.html (9,461 bytes)
4. Re: Topband: 8877 Tube (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 14 Nov 2012 20:15:36 -0500; The Spec Sheet for the 8877 tube lists the "Absolute Maximum Plate Voltage of 4000 Volts" for the tube, and also says in "typical operation" the plate voltage is between 2700 and 3500 volts. In my am; /archives//html/Topband/2012-11/msg00210.html (8,762 bytes)
5. Re: Topband: 8877 Tube (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Wed, 14 Nov 2012 21:49:32 -0500; Is that at full power out or in standby? Carl KM1H Wonder if someone can help with a technical question with the amp I use on 160 meters. The Spec Sheet for the 8877 tube lists the "Absolute Maximum; /archives//html/Topband/2012-11/msg00216.html (8,484 bytes)
6. Re: Topband: 8877 Tube (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Wed, 14 Nov 2012 21:59:29 -0500; The 5.5V is a ploy to get higher emission at the expense of operational life. It still has an 8877 filament. Eimac has been doing similar since WW2 with pulse versions of various tubes. Carl KM1H Bob; /archives//html/Topband/2012-11/msg00217.html (10,648 bytes)
7. Re: Topband: 8877 Tube (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Wed, 14 Nov 2012 21:56:11 -0500; The only problem with pushing an 8877 or the 3CPX to or over the 4KV limit is that it enhances the chance of instability. Carl KM1H Bob, A non-issue. Many of us have been running 8877s with Ep of 4KV; /archives//html/Topband/2012-11/msg00218.html (9,918 bytes)
8. Re: Topband: 8877 Tube (score: 1): Author: John Harden <jhdmd@bellsouth.net>; Date: Thu, 15 Nov 2012 06:17:35 -0500; The Alpha 77-SX is a great amplifier with plenty of reserve. The plate voltage runs just under 4KV on the Hi-Power position. If you go to the larger transformers you are asking for trouble. The filte; /archives//html/Topband/2012-11/msg00221.html (10,787 bytes)

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