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301. Re: [Amps] SB-220 grid current (score: 1): Author: Gudguyham@aol.com; Date: Fri, 24 Nov 2006 18:09:32 EST; Hi Gang.......what could cause the grid meter to swing negative and no power out? Leon, N5PU Your grid shunt resistor .82 ohms is opened. I sell them. 73 Lou _________________________________________; /archives//html/Amps/2006-11/msg00262.html (6,589 bytes)
302. Re: [Amps] SB-220 grid current (score: 1): Author: Gudguyham@aol.com; Date: Mon, 27 Nov 2006 01:55:26 EST; In a GG amp a negative grid meter swing is caused by a short from the cathode to chassis ground. That can be a shorted tube or anything on the cathode shorted to the chassis. In an Sb-220, if the amp; /archives//html/Amps/2006-11/msg00266.html (7,167 bytes)
303. Re: [Amps] Collins 30L-1 Bouncy Meter (score: 1): Author: Gudguyham@aol.com; Date: Mon, 27 Nov 2006 18:45:40 EST; I have a 30L-1 with a real "bouncy" meter. When switching from DC volts (~1900V) to either Tune or DC Amps, the meter swings down to about minus 400-600v before coming back to rest at Zero. Also, whe; /archives//html/Amps/2006-11/msg00269.html (7,357 bytes)
304. Re: [Amps] Dentron DTR 2000L MOD (score: 1): Author: Gudguyham@aol.com; Date: Mon, 4 Dec 2006 08:31:19 EST; I'm looking for a friend for the K5WL modification for the DTR 2000L amplifier,,,,,, I know there's the need to replace transformer but what other Mods need to be made to complete modification. Tjhan; /archives//html/Amps/2006-12/msg00012.html (7,059 bytes)
305. Re: [Amps] 3-500 sockets (score: 1): Author: Gudguyham@aol.com; Date: Sun, 10 Dec 2006 22:04:12 EST; The Johnson style sockets are very plentiful so see if you can find a used one. There is an individual on this list that sells used ones all the time. I have them if you need them...73 Lou W1QJ _____; /archives//html/Amps/2006-12/msg00062.html (6,761 bytes)
306. Re: [Amps] MLA2500 10 Meter Mod (score: 1): Author: Gudguyham@aol.com; Date: Mon, 18 Dec 2006 08:06:15 EST; have my MLA2500 up for sale on QTH.com and I received a query as to whether the 10 Meter mod had been done. How do you tell other than trying to load it up on 10? Bob W6TR Bob, The band switch should; /archives//html/Amps/2006-12/msg00133.html (7,681 bytes)
307. Re: [Amps] TT 425 low plate voltage (score: 1): Author: Gudguyham@aol.com; Date: Sun, 31 Dec 2006 17:42:28 EST; With no drive it's showing about 1500v Ep in the low position and 2000v Ep in the high position. The book says I should see 1900v Ep in low position and 2700v Ep in high Could be that the HV metering; /archives//html/Amps/2006-12/msg00241.html (6,544 bytes)
308. Re: [Amps] SB-220 Improvements (score: 1): Author: Gudguyham@aol.com; Date: Mon, 15 Jan 2007 08:31:41 EST; I am currently modifying an SB-220 for use on 6 meters by changing the 10 meter section as per the QST article (SB-220 0N 6 METERS) and leaving the rest of the amp band positions unchanged on HF. The; /archives//html/Amps/2007-01/msg00156.html (7,544 bytes)
309. Re: [Amps] SB-220 Improvements (score: 1): Author: Gudguyham@aol.com; Date: Mon, 15 Jan 2007 16:04:18 EST; Yeah well if it is printed in QST it is approved by God himself isn't it? You cant believe everything you read. I agree with Lou, the 220 is best converted to completely be on 6 meters by itself. The; /archives//html/Amps/2007-01/msg00160.html (7,942 bytes)
310. Re: [Amps] SB-220 Improvements (score: 1): Author: Gudguyham@aol.com; Date: Mon, 15 Jan 2007 16:02:07 EST; I wouldn't use a pair of 3-500Z's on six meters even if it was dedicated. An SB-220 using a pair of 3-500's make a SUPER 6 meter amplifier. I beg to differ. 73 Lou ___________________________________; /archives//html/Amps/2007-01/msg00166.html (7,815 bytes)
311. [Amps] EIMAC (8877 TYPE) TUBES FOR SALE (score: 1): Author: Gudguyham@aol.com; Date: Wed, 17 Jan 2007 14:44:45 EST; Offering for sale a rare find in tubes. A matched pair of industrial YC-257's These tubes are the industrial strength type 3CPX1500A7 tubes. Plate voltage higher than regular 8877 5KV+. More power, l; /archives//html/Amps/2007-01/msg00175.html (6,591 bytes)
312. Re: [Amps] EIMAC (8877 TYPE) TUBES FOR SALE (score: 1): Author: Gudguyham@aol.com; Date: Wed, 17 Jan 2007 15:09:47 EST; One small thing - they are a little bit taller than a standard 8877 so beware if there's anything immovable or critical around the anode connection. Steve True, they are about 3/8" of an inch taller,; /archives//html/Amps/2007-01/msg00177.html (7,297 bytes)
313. Re: [Amps] EIMAC (8877 TYPE) TUBES FOR SALE (score: 1): Author: Gudguyham@aol.com; Date: Wed, 17 Jan 2007 16:18:57 EST; If they produce more power and less drive, they can hardly be termed direct replacements can they? The 8877 are sold for industrial purposes. They are not made just for hams. For those who really car; /archives//html/Amps/2007-01/msg00180.html (7,453 bytes)
314. Re: [Amps] YC-257 VS 8877 (score: 1): Author: Gudguyham@aol.com; Date: Thu, 18 Jan 2007 10:29:31 EST; If you get a good 3CPX it should work good - last long time. BOB DD Bob, this is the information I obtaind BEFORE I offered the tubes for sale for amatuer use. I would NOT have bought them myself if; /archives//html/Amps/2007-01/msg00187.html (7,578 bytes)
315. [Amps] SELL: set of matched 3CPX1500A7's (score: 1): Author: Gudguyham@aol.com; Date: Fri, 19 Jan 2007 10:45:56 EST; Offering a late date coded match set of 3CPX1500A7 tubes. For home brewers these tubes will handle more than 5KV of plate voltage, unlike regular 8877 tubes. These can be sustituted for regular 8877; /archives//html/Amps/2007-01/msg00190.html (6,453 bytes)
316. Re: [Amps] EIMAC (8877 TYPE) TUBES FOR SALE (score: 1): Author: Gudguyham@aol.com; Date: Sat, 20 Jan 2007 02:53:36 EST; I think he meant to describe his tubes as best he understood...I assume he would offer a refund if for some reason his tubes didn`t work out for someone....Afterall,he has posted her for several yrs; /archives//html/Amps/2007-01/msg00193.html (8,549 bytes)
317. Re: [Amps] EIMAC (8877 TYPE) TUBES FOR SALE (score: 1): Author: Gudguyham@aol.com; Date: Sat, 20 Jan 2007 03:09:02 EST; I had a similar thing happen on eBay. An oscillator was advertised an an HP 10811A, which is what I wanted. I won the auction. The seller then offered me some other model instead if i wanted it. So I; /archives//html/Amps/2007-01/msg00194.html (9,294 bytes)
318. Re: [Amps] EIMAC (8877 TYPE) (score: 1): Author: Gudguyham@aol.com; Date: Sat, 20 Jan 2007 04:13:54 EST; Obviously the experience levels are no where near the same. Bob, this is soooooo true. Someone here recently said they would never build an amp for 6 meters using a pair of 3-500 tubes. Someone who n; /archives//html/Amps/2007-01/msg00196.html (7,823 bytes)
319. Re: [Amps] EIMAC (8877 TYPE) (score: 1): Author: Gudguyham@aol.com; Date: Sat, 20 Jan 2007 10:25:34 EST; I'll tell you guys an interesting little story about 6 meter amps that is relevant to this discussion. A few years ago a friend came to me for help with getting an amplifier working on 6 meters. He f; /archives//html/Amps/2007-01/msg00199.html (8,838 bytes)
320. Re: [Amps] EIMAC (8877 TYPE) (score: 1): Author: Gudguyham@aol.com; Date: Sun, 21 Jan 2007 06:40:02 EST; If practical experience seems to contradict that kind of theory, it's a reliable sign that you got something wrong. And that can be a very useful thing to know. In layman's terms I would say " the pr; /archives//html/Amps/2007-01/msg00207.html (7,601 bytes)

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