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201. Re: [Amps] No lids, no kids, no . . . (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 27 Sep 2007 22:34:23 -0400
The one Im thinking of turned out to be W1TJX from Putnam, CT. This was on AM in the late 50's to mid 60's. He was old then. I remember K1SJ also but with the Beverages he wasnt strong enough up here
/archives//html/Amps/2007-09/msg00442.html (9,209 bytes)

202. Re: [Amps] The HT-33B and swamped grid (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 28 Sep 2007 09:16:51 -0400
If there ever were candidates for a tube swap the HT-33A & B's are right up there with the MLA-2500 and HT-41. There is nothing wrong with the tubes except availability and cost. The sraight 33 uses
/archives//html/Amps/2007-09/msg00457.html (9,362 bytes)

203. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 28 Sep 2007 09:37:21 -0400
250/245 ma and 262/470 W PEP Note they specify PEP. There is also a "worst case" 3rd order line entry of -29/21dB. With the tendency to use these tubes (the full 250 family)at their maximum voltage a
/archives//html/Amps/2007-09/msg00458.html (9,646 bytes)

204. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 28 Sep 2007 09:50:01 -0400
Looking at the Eimac data it doesnt appear that the VR tubes had much effect but that was back in my BC days. Im guessing that they did their measurements with VR tubes also. Later testing did show i
/archives//html/Amps/2007-09/msg00459.html (9,457 bytes)

205. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 28 Sep 2007 11:58:37 -0400
I wouldnt even think about trying that on this amp. Sorry if I wasnt plain about that. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2007-09/msg00462.html (8,240 bytes)

206. Re: [Amps] The HT-33B and swamped grid (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 28 Sep 2007 13:03:47 -0400
The Dentron original DTR-2000L had only a muffin fan on the 8877. Not good for heavy use as it was replaced by a small squirrel cage in later models. In the HT-33 anode temperature testing would tel
/archives//html/Amps/2007-09/msg00468.html (10,579 bytes)

207. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 28 Sep 2007 13:13:36 -0400
That rating is for AB1 SSB service, 2KV@ 250ma is the listed typical operation for one tube as with all in the straight 4CX250W family. Carl KM1H _______________________________________________ _____
/archives//html/Amps/2007-09/msg00470.html (10,187 bytes)

208. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 29 Sep 2007 09:12:07 -0400
The tube is being tested in AB1, ZERO grid current, therefore Eimac is not overdriving it. They are simply showing the degradation when the tube is run at its TYPICAL rating of 2KV. I have no idea ho
/archives//html/Amps/2007-09/msg00474.html (11,468 bytes)

209. Re: [Amps] IMD (Some important useful corrections) (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 29 Sep 2007 11:08:25 -0400
I simply stated that EIMAC was not overdriving it in their test. Or dont you give them credit either for knowing how to run tests? Was the modern and accurate PEP meter being used at Eimac or were t
/archives//html/Amps/2007-09/msg00480.html (13,721 bytes)

210. Re: [Amps] HF amp output power dropping (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 29 Sep 2007 13:56:46 -0400
It could very well be the plate blocking cap, especially if it is undersized for that power or not even rated for RF use such as the TV doorknobs. Also check the filament voltage, filament choke and
/archives//html/Amps/2007-09/msg00491.html (9,075 bytes)

211. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 29 Sep 2007 15:51:12 -0400
What both of you continuously fail to understand is that the tube is being run within its manufacturers published ratings. No amount of side stepping can change that fact. It is also an established f
/archives//html/Amps/2007-09/msg00496.html (10,781 bytes)

212. Re: [Amps] HF amp output power dropping (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 29 Sep 2007 22:33:27 -0400
Try and have it your way as usual. Ive seen plenty of plate blocking caps heat up and change the output tuning and still not be at the point of failure. I'll mail the next one I find to somone that c
/archives//html/Amps/2007-09/msg00500.html (8,776 bytes)

213. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 30 Sep 2007 08:34:01 -0400
Those last three sentences make absolutely no sense. Input power is 500WDC, Output is 470W PEP, not key down CW. I'll use CW since some seem to be getting confused with single and two tone reference
/archives//html/Amps/2007-09/msg00506.html (9,753 bytes)

214. Re: [Amps] Blocking capacitor drift (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 30 Sep 2007 08:46:28 -0400
More wasted drivel and bandwidth when your last paragraph says it all in a nutshell. A defective cap can be breaking down internally before it shows any external sign of its impending destruction. Th
/archives//html/Amps/2007-09/msg00508.html (10,659 bytes)

215. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 30 Sep 2007 09:07:50 -0400
Two tone PEP has been mentioned several times as the reference used for the 4CX250R under discussion. Oh yes it has. I asked how Eimac measured PEP in the 50's. Some of the youngsters on here might b
/archives//html/Amps/2007-09/msg00510.html (8,595 bytes)

216. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 30 Sep 2007 10:08:52 -0400
That is a 1982 revision of my 1961 sheet. thanks for posting it. They added a line indicating a "brief tune up" power input as well as one for tune up screen current. Interesting as I dont believe Iv
/archives//html/Amps/2007-09/msg00513.html (10,008 bytes)

217. Re: [Amps] Blocking capacitor drift (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 30 Sep 2007 10:10:48 -0400
We are on the same page Peter. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-09/msg00514.html (7,992 bytes)

218. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 30 Sep 2007 17:11:01 -0400
I was surprised to learn that the silicon point contact diode was patented in 1906. Steve And it was strictly a curiosity until much later. When did it enter into mass production? SSB was developed i
/archives//html/Amps/2007-09/msg00521.html (9,401 bytes)

219. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 30 Sep 2007 17:17:01 -0400
How did RCA sneak in here? I dont have any RCA specs on the 250 family to compare to Eimac. But there are plenty who will pay loads of money for a meter that reads to 3 decimals but be absolutely clu
/archives//html/Amps/2007-09/msg00522.html (9,455 bytes)

220. Re: [Amps] 4CX250 IMD (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 1 Oct 2007 09:17:21 -0400
Thats exactly what I was getting at. Fairly good, reasonably accurate, dont exactly give me a warm feeling. Having worked in a RF lab with 50's era test equipment in the early 60's I always had the f
/archives//html/Amps/2007-10/msg00005.html (8,908 bytes)

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