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Total 55 documents matching your query.

41. Re: [Amps] Alpha 77Dx (score: 1): Author: N7SC <n7sc@charter.net>; Date: Wed, 21 Jan 2009 12:54:46 -0800; Hi Paul... I don't have the 77 schematic in front of me, but it sounds like one possibility is an intermittent filament to cathode short. 73... Steve/N7SC ____________________________________________; /archives//html/Amps/2009-01/msg00218.html (7,211 bytes)
42. Re: [Amps] Alpha 77Dx (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 21 Jan 2009 19:19:40 -0500; If you have access to a megger Id test the tube interelemrnt breakdown, keeping within the tube specs. It could also be a leaky electrolytic in the bias circuit, monitoring the cut-off voltage may yi; /archives//html/Amps/2009-01/msg00221.html (9,457 bytes)
43. Re: [Amps] Alpha 77Dx (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 22 Jan 2009 06:51:33 -0500; Carl & Steve, Thanks for your excellent suggestions. My first thought was a cathode-to-filament fault. I'll be swapping tubes to verify. If its not the 8877, I will be investigating Carl's suggestio; /archives//html/Amps/2009-01/msg00235.html (7,237 bytes)
44. [Amps] Alpha 77dx (score: 1): Author: "k9sd" <k9sd@ezl.com>; Date: Sun, 1 Feb 2009 11:36:04 -0600; In standby the grid current is showing negative ...good power out and works ok . I haven't checked anything else ...does this automatically mean there is a tube problem ?? Thanks for any ideas.. Sam; /archives//html/Amps/2009-02/msg00011.html (6,733 bytes)
45. Re: [Amps] Alpha 77dx (score: 1): Author: Gudguyham@aol.com; Date: Sun, 1 Feb 2009 12:38:39 EST; Your grid shunt resistor may be opened. Find it and check to see if it is opened, that will cause the problem you see, but the amp will still work. Please let us know if that was your problem. Lou _w; /archives//html/Amps/2009-02/msg00012.html (6,669 bytes)
46. [Amps] Alpha 77DX (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Wed, 26 May 2010 23:18:08 -0500; I have purchased a one owner Alpha 77DX, from the estate of a recent SK. This amp had little use, and to the best of my knowledge was not used at all since about 1981/83. The original invoice (1977); /archives//html/Amps/2010-05/msg00413.html (8,335 bytes)
47. Re: [Amps] Alpha 77DX (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Sun, 30 May 2010 18:07:55 -0500; Regarding my Alpha 77DX questions and issues: I have made arrangements to purchase a set of new or like new side and top panels, along with a good used Alpha 77DX front panel, from a list member. Reg; /archives//html/Amps/2010-06/msg00009.html (7,835 bytes)
48. [Amps] Alpha 77DX (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 1 Jun 2010 07:28:07 -0700; Regarding my Alpha 77DX questions and issues: Regarding the oil filled capacitor, I tested the value prior to operational testing of the amplifier; the value is 25 microfarads as rated. After cleani; /archives//html/Amps/2010-06/msg00018.html (7,634 bytes)
49. [Amps] Alpha 77DX (score: 1): Author: Dan Hearn <n5ardxcc@gmail.com>; Date: Sun, 20 Oct 2013 14:13:55 -0700; After 17 years of reliable service the set of 4 push buttons on the right front refuse to latch when pushed in. Of course the amp will not turn on then. The manual says that there is a solenoid below; /archives//html/Amps/2013-10/msg00361.html (7,354 bytes)
50. Re: [Amps] Alpha 77DX (score: 1): Author: George <at6c@bellsouth.net>; Date: Sun, 20 Oct 2013 19:33:55 -0500; Hi Dan, I have a 77SX and if you find a place to buy those switches let me know. I would not be comfortable using the amp without the switch unless I put a HV fuse in line with the B+ and probably a; /archives//html/Amps/2013-10/msg00367.html (8,871 bytes)
51. [Amps] Alpha 77DX (score: 1): Author: Lou <beethoven1@sbcglobal.net>; Date: Sun, 15 May 2016 05:13:33 -0800; Alpha 77DX has no RF output..Checked bias,input and output relays, tube, all tested good..Any suggestions ? _______________________________________________ Amps mailing list Amps@contesting.com http:; /archives//html/Amps/2016-05/msg00025.html (6,655 bytes)
52. [Amps] Alpha 77DX (score: 1): Author: Lou <beethoven1@sbcglobal.net>; Date: Sun, 15 May 2016 11:16:54 -0800; Alpha 77DX no RF output on any band..Bias,RF input relays and tube OK...Would appreciate any info.. Lou.. _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2016-05/msg00026.html (6,237 bytes)
53. Re: [Amps] Alpha 77DX (score: 1): Author: n8de@thepoint.net; Date: Tue, 17 May 2016 14:31:59 -0400; Is the RF drive getting to the tube? Might be an open capacitor or coil. 73 Don N8DE Alpha 77DX no RF output on any band..Bias,RF input relays and tube OK...Would appreciate any info.. Lou.. ________; /archives//html/Amps/2016-05/msg00027.html (7,458 bytes)
54. Re: [Amps] Alpha 77DX (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Tue, 17 May 2016 13:04:05 -0600; Lou, do you get any grid current and plate current? And I assume you've got HV. How about input VSWR? Shouldn't be a hard problem to diagnose. 73, Jim W8ZR Sent from my iPhone _______________________; /archives//html/Amps/2016-05/msg00029.html (7,492 bytes)
55. [Amps] Alpha 77DX (score: 1): Author: Lou <beethoven1@sbcglobal.net>; Date: Mon, 20 Jun 2016 10:10:52 -0700; What is the price for a later model Alpha 77DX in nice condition? Thanks.. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li; /archives//html/Amps/2016-06/msg00076.html (6,557 bytes)

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