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Total 1109 documents matching your query.

201. Re: [Amps] [rfamplifiers] which cathode choke? (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Tue, 23 Dec 2008 00:15:34 -0500
"Back in the old day", I wound a number of them on ferrite rods. I only remember the approximation of size but it seems as if the specs were in one of the handbooks. The rod was between 1/2 and 5/8"
/archives//html/Amps/2008-12/msg00294.html (9,264 bytes)

202. Re: [Amps] [rfamplifiers] which cathode choke? (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Tue, 23 Dec 2008 16:59:28 -0500
I think I built them just shortly before the kit came out. If memory serves correctly I purchased a dozen of the rods, but I don't remember where I purchased the enameled #10. There were a lot more s
/archives//html/Amps/2008-12/msg00310.html (11,400 bytes)

203. [Amps] HV Interlocks on remote PS (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Tue, 23 Dec 2008 18:24:11 -0500
With the discussion of HV wire between remote power supplies and the amp, I'm wondering how many actually use an interlock to shut off the HV in case the ground or HV wire become disconnected. If any
/archives//html/Amps/2008-12/msg00311.html (8,352 bytes)

204. Re: [Amps] 3CPX800A7 (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 25 Dec 2008 13:59:20 -0500
They are basically the same tube except the "P" has more cathode emission capability (IIRC). They are physically the same so there is no more "head room" than with the regular 3CX800. IOW used in a g
/archives//html/Amps/2008-12/msg00330.html (9,169 bytes)

205. Re: [Amps] Alpha 91b chimney? (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Mon, 29 Dec 2008 22:39:28 -0500
Silastic RTV (TM). The stinky stuff that can be corrosive when contained. It makes great butt splices with silicone rubber. You really don't need the high temp version, but it is available and the sa
/archives//html/Amps/2008-12/msg00372.html (8,201 bytes)

206. Re: [Amps] Thanks, Hipersil, the myth and the truth. (Updated) (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 02 Jan 2009 10:24:50 -0500
I don't see anything really new here, but I've worked with transformers. It's a very good explanation in plain language. IOW, Hypersil (TM) which is E6 is the best, or most efficient core material EI
/archives//html/Amps/2009-01/msg00010.html (10,316 bytes)

207. Re: [Amps] 3CX1500D7 quote (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 07 Jan 2009 22:56:55 -0500
You can get the GS35B new for $109, or 6 for $100 each. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi
/archives//html/Amps/2009-01/msg00050.html (7,923 bytes)

208. Re: [Amps] 3CX1500D7 quote (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 08 Jan 2009 01:41:26 -0500
Back in the mid to late 70's I was paying $305USD for new, Eimac 3CX1500A7/8877 and that was supposed to be wholesale. They were retailing around $500 IIRC. Now they list (last I looked) at $800 USD
/archives//html/Amps/2009-01/msg00056.html (9,550 bytes)

209. Re: [Amps] Interesting site (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 15 Jan 2009 18:50:11 -0500
They have a familiar look, but appear quite different inside. Now those use some rugged tubes and look what you get for the new price of an 8877. I'd like to have one of those 2006's on 6 meters. 73
/archives//html/Amps/2009-01/msg00131.html (7,239 bytes)

210. Re: [Amps] Amp Comparison Advice Please (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Mon, 19 Jan 2009 01:40:13 -0500
I'm going to have to disagree with Mike on a couple of points. First, I've had and used about everything Dentron sold. The Cliperton is a nice little amp, but I don't consider it to be half the amp t
/archives//html/Amps/2009-01/msg00159.html (10,467 bytes)

211. Re: [Amps] Plate bypass caps (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Mon, 19 Jan 2009 22:42:04 -0500
Ah, come on Carl. If you like that glow, get a pair of 6C21s<:-)) They drive with no more than a slight breeze, and are a real challenge to neutralize on more than 3 bands at a time. I think the cath
/archives//html/Amps/2009-01/msg00180.html (9,945 bytes)

212. Re: [Amps] plate bypass caps (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Tue, 20 Jan 2009 22:59:35 -0500
Tubes get gassy, caps get leaky, resistors change values, bout the only thing that leaves is tank coils not changing values...Without outside interferrence <:-)) Old hams change values, while getting
/archives//html/Amps/2009-01/msg00192.html (7,908 bytes)

213. Re: [Amps] 3-500zs to 8877 (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 21 Jan 2009 15:58:18 -0500
Welll... The Henry series runs fairly low voltage on its tubes, at least the 3-500s. Although I think the Henry consoles make a good base (pun not intended) for building a more powerful and rugged am
/archives//html/Amps/2009-01/msg00219.html (12,303 bytes)

214. Re: [Amps] Is there a Henry model which ... (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 21 Jan 2009 20:23:19 -0500
I only mention the 2K4 as I had one and there is little difference between it and the earlier floor model/classic. The Henry offers three things. Space in which to work, a lot of iron, and a big blow
/archives//html/Amps/2009-01/msg00224.html (12,151 bytes)

215. Re: [Amps] 3-500zs to 8877 (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 21 Jan 2009 20:26:35 -0500
A bit, but it's just a time delay to prevent keying up before the warm up 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
/archives//html/Amps/2009-01/msg00225.html (14,295 bytes)

216. Re: [Amps] Amps Digest, Vol 73, Issue 32 (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 21 Jan 2009 20:28:17 -0500
Make that a 3CX-1200 <:-)) 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-01/msg00226.html (8,677 bytes)

217. Re: [Amps] 3-500zs to 8877 (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 22 Jan 2009 00:29:46 -0500
No Way I could adhere to that. I keep a widely varied schedule and often don't go to bed until some where between 2:00 and 5:30 AM. I may operate for a while during different times of the day. Even t
/archives//html/Amps/2009-01/msg00231.html (10,920 bytes)

218. Re: [Amps] Shaft Misalignment Solutions (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 23 Jan 2009 00:54:15 -0500
Take a look at How Henry Radio did this. If you can't find any photos, I'll try to find those I shot of my 2K4 when I had it apart. 73 Roger (K8RI) _______________________________________________ Amp
/archives//html/Amps/2009-01/msg00264.html (8,788 bytes)

219. Re: [Amps] 3CX1500D7 (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 23 Jan 2009 00:56:30 -0500
You can also purchase imported ones for a bit over $300. Remember too that it takes three 3-500's to equal the same dissipation and only about 50 watts drive for the legal limit output. 73 Roger (K8R
/archives//html/Amps/2009-01/msg00265.html (7,287 bytes)

220. Re: [Amps] pole pigs (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 29 Jan 2009 21:48:28 -0500
I'm not sure where the dividing line runs between 2 and 3 phase, or how small you can get a 3 phase. We had a one that was larger than 12 KVA single phase. We bunred the 6KV6 to a crisp. (All electri
/archives//html/Amps/2009-01/msg00368.html (8,851 bytes)

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