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241. Re: [Amps] LK 500 ZA bandswitch (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 25 Oct 2007 15:08:43 -0400
Mouser can get you a new switch for $226 ! I just bought one for a customer repair. Part # is E4C0408N and neither Mouser or Electroswitch was interested in supplying just a wafer. The problem is not
/archives//html/Amps/2007-10/msg00242.html (9,504 bytes)

242. Re: [Amps] LK550-ZC (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 29 Oct 2007 09:49:42 -0400
The complete Amp Supply product line was an ever evolving beast. A late A model may have had some B circuitry, A B had some C and a C had several production changes. On top of that changes were made
/archives//html/Amps/2007-10/msg00255.html (8,718 bytes)

243. Re: [Amps] Fil transformer (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 29 Oct 2007 10:25:42 -0400
Im looking for 10V @ 20A Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-10/msg00257.html (6,970 bytes)

244. Re: [Amps] Thoughts after a weekend with my SB-200 during CQWW SSB (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 30 Oct 2007 08:22:23 -0400
Dont waste your money on another fan. Remove that one, clean and lube and it will be fine for another 30+ years. If you plan RTTY keep the output down to around 300-400W. A muffin fan on top to draw
/archives//html/Amps/2007-10/msg00270.html (12,028 bytes)

245. Re: [Amps] Ameritron AL-1200 (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 30 Oct 2007 14:00:04 -0400
There are those who would have you believe that Ameritron used a special capacitor not available to us common folk. I have no idea if it is true but I suggest that you call Ameritron and dont rest un
/archives//html/Amps/2007-10/msg00274.html (9,378 bytes)

246. Re: [Amps] Ameritron AL-1200 (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 30 Oct 2007 17:44:26 -0400
Gerald, see an eye doctor! However if the replacement caps were those little imports its no wonder they failed. Carl KM1H _______________________________________________ Amps mailing list Amps@contes
/archives//html/Amps/2007-10/msg00276.html (12,168 bytes)

247. Re: [Amps] LK 500 ZA Plate Choke (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Wed, 31 Oct 2007 09:32:34 -0400
Ameritron, B&W 802, any other that covers the bands and has a similar footprint. The actual value isnt critical as long as it has sufficient inductance for 160M. Carl KM1H ___________________________
/archives//html/Amps/2007-10/msg00284.html (7,484 bytes)

248. Re: [Amps] Output Coupling Capacitors: Failure Mode? (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Wed, 31 Oct 2007 14:13:48 -0400
If the fixed caps for 160 arent overheating then they are a real long shot. How about the plate choke? Is it sufficient L for 160, does it look damaged? Same for the choke bypass cap. What type of in
/archives//html/Amps/2007-10/msg00290.html (9,928 bytes)

249. Re: [Amps] Considering an Alpha 76PA (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Wed, 31 Oct 2007 14:49:18 -0400
The nice thing about the 3 holer is that 100W of drive is split 3 ways and doesnt overdrive. Keep that grid current down, limit output to 1200-1300W and they will have a long happy life. Problems sta
/archives//html/Amps/2007-10/msg00292.html (9,999 bytes)

250. Re: [Amps] Considering an Alpha 76PA (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Wed, 31 Oct 2007 16:52:27 -0400
No, it has 10 470 Ohm 2W carbons in parallel. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-10/msg00295.html (11,587 bytes)

251. Re: [Amps] Considering an Alpha 76PA (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Wed, 31 Oct 2007 18:08:52 -0400
I dont know of any low drive mod for the 76CA/PA Gary. You may be thinking of the MLA-2500 and that mod was guaranteed to fry tubes. I dont remember any factory QSK option either, just an open frame
/archives//html/Amps/2007-10/msg00297.html (14,961 bytes)

252. Re: [Amps] Testing 8874s (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 1 Nov 2007 20:09:45 -0400
First step is to check for hard shorts with an Ohmeter. I would then test them as a single tube amp on 40M (just a personal preference for testing one tube in a multi tube amp). Install fuses 1/3rd t
/archives//html/Amps/2007-11/msg00008.html (9,379 bytes)

253. Re: [Amps] Testing 8874s (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 1 Nov 2007 22:00:16 -0400
Different strokes for different folks. Due to the cost of the 8874 many equipment owners tended to delay replacing until the customer complaints come in. These days the paging and data equipment is m
/archives//html/Amps/2007-11/msg00011.html (10,365 bytes)

254. Re: [Amps] Testing 8874s (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 2 Nov 2007 08:59:42 -0400
Highpot wouldnt hurt. I didnt mention it since it is not a common ham shack item. The one I built around a sign transformer goes up to 13 kV. Carl KM1H _______________________________________________
/archives//html/Amps/2007-11/msg00017.html (8,497 bytes)

255. Re: [Amps] Testing 8874s (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 2 Nov 2007 13:38:26 -0400
I believe that Rich Measures posted or published that info many years ago. I also used it mainly for vacuum caps and big glass jugs but its been years since Ive needed it. Carl KM1H _________________
/archives//html/Amps/2007-11/msg00021.html (9,127 bytes)

256. Re: [Amps] Testing 8874s (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 2 Nov 2007 17:58:38 -0400
The case of an oil burner transformer is hot?? That will surprise the hell out of millions of furnace owners and servicemen! I guess his comment explains why he got it so cheap.... Carl KM1H ________
/archives//html/Amps/2007-11/msg00031.html (12,156 bytes)

257. Re: [Amps] Drifting grid current (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 3 Nov 2007 11:49:26 -0400
Does it happen on all bands and into a dummy load? If so I'd suspect a tube. If it happens on a band that fixed capacitors are switched in then I'd suspect them. There could also be something heating
/archives//html/Amps/2007-11/msg00040.html (8,091 bytes)

258. Re: [Amps] SB-230 converted to two 572bs (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 8 Nov 2007 08:54:32 -0500
Start with basics. Remove the tubes and trace thru the voltage path from line cord to plate caps. Something is touching, misswired, shorted, or whatever. Carl KM1H ___________________________________
/archives//html/Amps/2007-11/msg00112.html (8,730 bytes)

259. Re: [Amps] 2 Tubes in Parrallel: (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 8 Nov 2007 21:00:45 -0500
This has been covered any number of times and is archived. In a few words: Handbook obsession with a Q of 12 is meaningless. If you notice the circuits used by many manufacturers over the years they
/archives//html/Amps/2007-11/msg00120.html (8,582 bytes)

260. [Amps] operating a transformer in oil (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 10 Nov 2007 10:22:20 -0500
Has anyone tried extending the power capability by placing one in oil? Im aware of the flux density, core size and all that but just curious how much leeway there is. Right now Im contemplating 500W
/archives//html/Amps/2007-11/msg00128.html (6,960 bytes)

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