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41. Re: [Amps] Alpha 78 Problem (score: 1): Author: K8MLM@aol.com; Date: Tue, 29 Dec 2009 20:44:55 EST; Properly adjusted the electronic bias works fine... no chop, no splatter. I installed a pot to fine tune adjust mine. Bob K8MLM In a message dated 12/29/2009 5:51:22 P.M. Eastern Standard Time, km1h@; /archives//html/Amps/2009-12/msg00564.html (11,120 bytes)
42. Re: [Amps] condition 4-1000A tubes? (score: 1): Author: k8mlm@aol.com; Date: Sat, 23 Jan 2010 09:17:23 EST; Happy New Year Dennis, I just plug mine in and let it rip. That is one rugged tube. When I first build my 4-1000 just for kicks I plugged in a 4-1000 I picked up at a HAMFEST for $1. It looked real b; /archives//html/Amps/2010-01/msg00283.html (7,587 bytes)
43. Re: [Amps] condition 4-1000A tubes? (score: 1): Author: k8mlm@aol.com; Date: Sat, 23 Jan 2010 16:20:45 EST; Sure was a well spent dollar. My 4-1000 beast is my favorite to operate. Bob K8MLM In a message dated 1/23/2010 2:32:57 P.M. Eastern Standard Time, mausoptik@btinternet.com writes: Lol! I bet that's; /archives//html/Amps/2010-01/msg00293.html (8,859 bytes)
44. Re: [Amps] 30S-1 Questions (score: 1): Author: K8MLM@aol.com; Date: Sat, 30 Jan 2010 13:34:29 EST; I had the same problem with a Henry 4-K-Ultra. Tighten the bolts on both the transformer & choke and all is well. 73, Bob K8MLM In a message dated 1/30/2010 12:37:01 P.M. Eastern Standard Time, ccurr; /archives//html/Amps/2010-01/msg00519.html (9,575 bytes)
45. [Amps] HENRY 4K-U; POOF EVENT (score: 1): Author: K8MLM@aol.com; Date: Sat, 13 Feb 2010 12:05:07 EST; Amps, I had a poof event on my Henry 4K-U. Appears the tube went south... no power out. I opened the amp and checked for any signs of failure or damage. Found none. Replaced the tube with a 8877 pull; /archives//html/Amps/2010-02/msg00368.html (6,895 bytes)
46. Re: [Amps] Manual tuned inputs (score: 1): Author: K8MLM@aol.com; Date: Fri, 9 Apr 2010 10:15:20 EDT; I built my 4-1000 amp with a manual input. Pi network used a 4uh variable inductor and fixed switched input and output caps for each band. Adjusted the 10m position with the cap right at the base of; /archives//html/Amps/2010-04/msg00312.html (11,663 bytes)
47. Re: [Amps] Fan for SB220 (score: 1): Author: K8MLM@aol.com; Date: Sat, 18 Dec 2010 14:37:59 EST; Paint the inside and outside black. The black inside will absorb the heat more effectively and the black outside will radiate it more effectively. Bob K8MLM In a message dated 12/18/2010 1:45:29 P.M.; /archives//html/Amps/2010-12/msg00206.html (15,478 bytes)
48. Re: [Amps] Fan for SB220 (score: 1): Author: K8MLM@aol.com; Date: Sat, 18 Dec 2010 14:43:06 EST; I meant to add. The big glass tubes cool the anodes by radiation. Base seals and anode seals are convection cooled. Black both absorbs and radiates heat more efficiently than any other color. Bob K8M; /archives//html/Amps/2010-12/msg00207.html (15,878 bytes)
49. Re: [Amps] Alpha 77 start up (score: 1): Author: k8mlm@aol.com; Date: Mon, 28 Feb 2011 12:58:25 -0500; Jan, I have some photographs of the botton input side of my amp. I'll send them to you tonight. Bob K8MLM Gentlemen and all others, I have begun troubleshooting and I would like to share the results,; /archives//html/Amps/2011-02/msg00208.html (10,765 bytes)
50. Re: [Amps] Alpha 77 start up (score: 1): Author: K8MLM@aol.com; Date: Wed, 2 Mar 2011 21:37:12 EST; Jan, You were talking about an input relay in line #4 of your 2/28 e-mail. The relay you are describing is K5, a vacuum relay, and is a SPDT output relay. The input relay, K4, a SPST is a reed relay.; /archives//html/Amps/2011-03/msg00029.html (8,427 bytes)
51. Re: [Amps] Alpha 77 start up (score: 1): Author: K8MLM@aol.com; Date: Thu, 3 Mar 2011 04:36:06 EST; Jan, OK Got it. No additional suggestions right now. Bob K8MLM In a message dated 3/2/2011 10:22:54 P.M. Eastern Standard Time, ditzian@windstream.net writes: Bob, The relay which seems not to work i; /archives//html/Amps/2011-03/msg00032.html (10,077 bytes)
52. Re: [Amps] Airflow meter (score: 1): Author: k8mlm@aol.com; Date: Fri, 15 Apr 2011 12:41:23 -0400; You have just described the airflow meter in all the modern automobile fuel management systems. Bob K8MLM Inexpensive units go for 20-30 USD on eBay. y ex-boss (Prof. D. T. Delpy) used a technique fo; /archives//html/Amps/2011-04/msg00442.html (12,058 bytes)
53. Re: [Amps] RF on audio using 374A (score: 1): Author: K8MLM@aol.com; Date: Thu, 15 Sep 2011 04:56:27 -0400 (EDT); Have you considered the dynamic bias circuit on the Alpha? I have an old Alpha 77 with dynamic bias that had a choppy sounding audio problem. I think the Alpha 374A may employ the same circuit as the; /archives//html/Amps/2011-09/msg00109.html (11,701 bytes)
54. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1): Author: K8MLM@aol.com; Date: Sun, 29 Apr 2012 21:12:29 -0400 (EDT); Joe, This is getting interesting. Please explain below statement. I know the FCC is kind-of backward, but why is it impractical? In a message dated 4/29/2012 8:43:25 P.M. Eastern Daylight Time, lists; /archives//html/Amps/2012-04/msg00270.html (7,207 bytes)

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