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281. [Amps] GigaVac GH3 Vacuum Relays (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 7 Jan 2011 08:31:08 -0500
Searching for the GigaVac GH1 relay, I found that Henry Radio has the 26VDC GH3 version of the GH1 for only USD $39.95. http://store03.prostores.com/servlet/henryradio/the-Henry-Amplifier-Repair-Part
/archives//html/Amps/2011-01/msg00056.html (6,858 bytes)

282. Re: [Amps] GigaVac GH3 Vacuum Relays (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 7 Jan 2011 09:30:57 -0500
Larry, Thanks for the link to the comparative table. I see now that the GH3/GH5 are not rated for RF. Looks like the GH1 through Henry Radio is still a good buy at about USD $50 ea., although out of
/archives//html/Amps/2011-01/msg00059.html (9,852 bytes)

283. Re: [Amps] MACHLETT tubes? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 9 Feb 2011 16:57:23 -0500
Machlett Labs was located in Springdale, CT and for a time, was a division of Raytheon. They produced some extreme examples of high-power VTs, many of which are water and vapor-phase cooled. Recently
/archives//html/Amps/2011-02/msg00067.html (8,827 bytes)

284. Re: [Amps] Alpha 77 start up (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 19 Feb 2011 14:29:21 -0500
Jan, The problem appears to be isolated to the three-minute warm-up timer. You're seeing 2600V which is correct while the three-minute timer is activating. First, measure the +24 VDC supply voltage.
/archives//html/Amps/2011-02/msg00144.html (10,605 bytes)

285. Re: [Amps] Alpha 77 start up (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 20 Feb 2011 20:33:01 -0500
The CW/LOW light should only come on when depressed after the 3-minute timer activation. The light cannot activate without the 3-minute timer working. Also, it should not immediately come on when dep
/archives//html/Amps/2011-02/msg00150.html (14,007 bytes)

286. Re: [Amps] Alpha 77 start up (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 21 Feb 2011 08:39:47 -0500
On the Alpha 77 series, access to the switch lamps can be accomplished from the front of the amp. The easiest way is to remove the top two lenses to give you better access to the STBY/READY lens. Ta
/archives//html/Amps/2011-02/msg00154.html (9,975 bytes)

287. Re: [Amps] Alpha 78 Labels/upgrades (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 27 Feb 2011 13:53:14 -0500
Eric, I believe the scale is removable in the 78/x74 as it is in 77 series. Another alternative is to out-source the scale to RAMMETERS.com. I know they've re-done old 78/x74 meter scales using the o
/archives//html/Amps/2011-02/msg00196.html (10,151 bytes)

288. Re: [Amps] Alpha 77 start up (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 28 Feb 2011 09:49:07 -0500
Jan, I think your reasoning is good. I'm not sure how the amp ever worked with the configuration you've described. K5 has all terminals populated. Two on the bottom for the coil and three on the top
/archives//html/Amps/2011-02/msg00204.html (9,488 bytes)

289. Re: [Amps] Alpha 77 start up (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 4 Mar 2011 07:39:03 -0500
Agree. Jan, replace K5 when it arrives and update us then. There should have been able to measure continuity between the vacuum relay wiper arm and the normally-closed terminal. With +24DC on the co
/archives//html/Amps/2011-03/msg00039.html (7,779 bytes)

290. Re: [Amps] New Alpha 8410 photos (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 6 Mar 2011 12:28:03 -0500
Alpha is using a high-volume, low-velocity blower design in the 8410. That's a great way to cool a pair of ceramic tubes but I'm not sure if that would add any contribution to lower noise with a sin
/archives//html/Amps/2011-03/msg00057.html (8,049 bytes)

291. Re: [Amps] New Alpha 8410 photos + Video (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 8 Mar 2011 13:33:03 -0500
A bit off-topic, but I've never understood why an ATU needs a cooling fan -- and for a manufacturer to make it a selling point :-) Paul, W9AC _______________________________________________ Amps mai
/archives//html/Amps/2011-03/msg00065.html (7,878 bytes)

292. Re: [Amps] New Alpha 8410 photos + Video (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 9 Mar 2011 11:35:58 -0500
True, but I'm referring to their past ATU designs with cooling fans. Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm
/archives//html/Amps/2011-03/msg00073.html (9,312 bytes)

293. [Amps] Tuner Loss (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 9 Mar 2011 12:17:32 -0500
But you can do a reasonably good job of avoiding the problems associated with physics if the underlying physics is understood. All tuners have loss. Some designs have less loss than others. A well-b
/archives//html/Amps/2011-03/msg00076.html (9,298 bytes)

294. Re: [Amps] New Alpha 8410 photos + Video (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 9 Mar 2011 12:49:52 -0500
That's just a bit more than 10% of maximum delivered power and cabinet ventilation openings should provide ample convection. Take for example the AT4K ATU. Into a 1:1 resistive 50-ohm load on 40m, lo
/archives//html/Amps/2011-03/msg00078.html (11,367 bytes)

295. [Amps] Tuner Loss (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 9 Mar 2011 12:57:35 -0500
I need to correct myself. I was reading data from the MFJ-974 tuner. Perhaps MFJ should include a cooling fan! However, even higher losses occur on 10m with the Palstar AT4K. Paul, W9AC _____________
/archives//html/Amps/2011-03/msg00080.html (9,349 bytes)

296. Re: [Amps] Tuner Loss (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 22 Mar 2011 12:12:33 -0400
One advantage of the reversible "L" is that the tuning/matching function is generally optimized with one set of variables. But care is needed in the switched reversing design to keep high coil Q acro
/archives//html/Amps/2011-03/msg00166.html (10,641 bytes)

297. Re: [Amps] 813 Amplifier Article (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 30 Mar 2011 19:45:25 -0400
Vic's 2 X 813 amp gets my vote for the "coolest-looking" amp ever made. Check it out on his website and see if you don't agree. Classic round metering, jeweled lamps, RCA knobs, heavy-duty toggle swi
/archives//html/Amps/2011-03/msg00277.html (8,772 bytes)

298. Re: [Amps] Alpha vs Henry (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 3 Apr 2011 10:35:01 -0400
George, If 160m is of interest to you, may want to re-evaluate Henry amps, including the 5K. Concerning mods for the 77Dx/Sx: few mods have been published and either version of the 77 is fine as it i
/archives//html/Amps/2011-04/msg00019.html (10,129 bytes)

299. Re: [Amps] what is a 4 wire 240VAC service? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 3 Apr 2011 15:14:03 -0400
AB2ZY: Replace the word "neutral" and substitute with "ground". Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li
/archives//html/Amps/2011-04/msg00037.html (9,379 bytes)

300. Re: [Amps] what is a 4 wire 240VAC service? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 3 Apr 2011 15:33:12 -0400
"...All of the receptacles specified for power NEMA L14-20R is 3 pole, 4wire. "...he said he could not endorse an 2 wire, three pole grounding (NEMA And L6-20R is 2 pole, 3wire. Both locking receptac
/archives//html/Amps/2011-04/msg00042.html (9,355 bytes)

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