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Total 12 documents matching your query.

1. [AMPS] PA-77 question, round two (score: 1): Author: w4asm@mindspring.com (Jack Brabham); Date: Sat, 11 Sep 1999 13:49:18 -0400; Alek and all who replied, Thanks for the helpful ideas. I opened the grid return line above the bias switch (Q5) and inserted a VOM. When the VOM indicates 100 ma. of grid current, the panel meter re; /archives//html/Amps/1999-09/msg00084.html (11,599 bytes)
2. [AMPS] PA-77 question, round two (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sat, 11 Sep 1999 13:04:07 -0500; When a good 8877 is properly tuned (slightly heavy loading) it will put around 2300 watts into the antenna with 55-65 ma of TRUE grid current. I have had several Alpha 77DX/77SX's and all of them rea; /archives//html/Amps/1999-09/msg00085.html (11,635 bytes)
3. [AMPS] PA-77 question, round two (score: 1): Author: measures@vcnet.com (measures); Date: Sat, 11 Sep 1999 11:21:22 -0700; Eimac rates the 8877 at 20w max. grid dissipation. Normal grid/cathode potential is 55Vrms. With 75mA of grid current, dissipation is approx. 4.1w. Why do you limit grid current to 75mA, Phil? - Ric; /archives//html/Amps/1999-09/msg00086.html (8,522 bytes)
4. [AMPS] PA-77 question, round two (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 11 Sep 1999 11:38:21 -0700; Jack:I own a 77DX and was concerned that a grid current of about 100ma is needed to develop the legal limit output.A change of tubes resulted in the same result. I posted a query on Amps about other; /archives//html/Amps/1999-09/msg00087.html (14,214 bytes)
5. [AMPS] PA-77 question, round two (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sat, 11 Sep 1999 16:40:36 -0500; -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.con; /archives//html/Amps/1999-09/msg00089.html (9,120 bytes)
6. [AMPS] PA-77 question, round two (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sat, 11 Sep 1999 16:55:51 -0500; Rich, Eimac is in the business of selling tubes. I am in the business of having to buy tubes. Prices are soaring, as I am sure you know. Why push your luck on a very fragile grid when all you need i; /archives//html/Amps/1999-09/msg00090.html (9,602 bytes)
7. [AMPS] PA-77 question, round two (score: 1): Author: measures@vcnet.com (measures); Date: Sat, 11 Sep 1999 21:50:51 -0700; I have a dissassembled 8877 in front of me. The grid is composed over of slightly over 100 gold-plated molybdeum bars Elevating such a grid to a high enough temperature to boil gold would require co; /archives//html/Amps/1999-09/msg00091.html (10,796 bytes)
8. [AMPS] PA-77 question, round two (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 12 Sep 1999 11:01:37 -0500; What would you limit the Ig to on your amp, Rich? Apparently, you think 75 ma is too low, although the tube is maxed out at 60-65 ma. Limiting the Ig to 75 ma allows the tube to operate at its maxim; /archives//html/Amps/1999-09/msg00092.html (9,494 bytes)
9. [AMPS] PA-77 question, round two (score: 1): Author: measures@vcnet.com (measures); Date: Sun, 12 Sep 1999 10:34:30 -0700; ? After having tested around a dozen kaput 8877s, I know that gold-sputtering is responsible for roughly 2/3 of 8877 failures. . . In order for gold to sputter, it must be boiled. This requires an i; /archives//html/Amps/1999-09/msg00094.html (11,639 bytes)
10. [AMPS] PA-77 question, round two (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 12 Sep 1999 17:31:58 -0500; - - What does a damaged grid of an 8877 look like, Phil? I have only seen pictures of them, Rich (yours) I have owned over 35 8877's of various vintages for various periods of time, some since 1979;; /archives//html/Amps/1999-09/msg00095.html (8,522 bytes)
11. [AMPS] PA-77 question, round two (score: 1): Author: n7rt@doitnow.com (Hardy Landskov); Date: Sun, 12 Sep 1999 18:08:44 -0700; Hi Jack, I took a look at the grid current measuring circuit in this Alpha 77DX and inserted my Fluke 8050A multimeter and for 200 mA of grid current on the amplifier meter the Fluke was measuring 60; /archives//html/Amps/1999-09/msg00098.html (8,970 bytes)
12. [AMPS] PA-77 question, round two (score: 1): Author: measures@vcnet.com (measures); Date: Sun, 12 Sep 1999 21:01:20 -0700; thanks, Phil - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.; /archives//html/Amps/1999-09/msg00099.html (8,782 bytes)

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