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81. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 28 Dec 2014 20:27:16 -0500
You cant make a valid comparison between 2 tubes that are operating at much different plate and screen voltages. Negative screen current is a function of voltage and loading and the basic 150A simply
/archives//html/Amps/2014-12/msg00131.html (12,370 bytes)

82. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Mon, 29 Dec 2014 20:05:27 -0500
He is asking about a PAIR of tubes in an amp he is looking at. One option there is that other tubes in the 4X150/250 family can be used that offer much better IMD For many a $700 Chinese 8877 is not
/archives//html/Amps/2014-12/msg00137.html (10,954 bytes)

83. Re: [Amps] Are the Older SB220 and SB200 Load Cap the Same? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 1 Jan 2015 10:19:48 -0500
The early SB-200 and 220 runs used the 2 section TRW cap which was pretty expensive as were the Cardwell/Johnson Tune caps. Both were replaced by the Oren Elliott caps, who is still in business. Carl
/archives//html/Amps/2015-01/msg00002.html (8,331 bytes)

84. Re: [Amps] k9yc pdf (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 13 Jan 2015 17:41:18 -0500
Not really -- what I've tried to do is show what matters, the effects of height and ground on both horizontal and vertical antennas. Those graphs showing the value, in dB, of antenna height, on 80, 4
/archives//html/Amps/2015-01/msg00098.html (11,517 bytes)

85. Re: [Amps] k9yc pdf (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 13 Jan 2015 21:01:40 -0500
I worked 2 real ones way back, Wayne Green and someone else who I don't remember, maybe a VE/KC4 It's the same distance and heading for CO, HH and HI, not rocket science. Carl KM1H Not really -- what
/archives//html/Amps/2015-01/msg00103.html (9,071 bytes)

86. Re: [Amps] re johnson air variable capacitors (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 17 Jan 2015 17:55:46 -0500
154-30 18-1000pf 1500V peak 154-3 19-488pf 2000V peak Same as the Cardwell who bought the Johnson cap line many decades ago Carl KM1H Looking for the specs on the following johnson air variable capac
/archives//html/Amps/2015-01/msg00140.html (10,733 bytes)

87. Re: [Amps] really outrageous amps (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 22 Jan 2015 17:59:48 -0500
Has anyone built up a 3CW20000A7? I know I had it book marked, but I can't find it. Seems like he was out of California. He had breakdown testers and built really outrageous amps and had designs and
/archives//html/Amps/2015-01/msg00201.html (8,297 bytes)

88. Re: [Amps] 5 Minutes for Ameritron 811H to warm up? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 23 Jan 2015 11:25:53 -0500
Those amps have had a lot of poor contact socket problems and Id take the cover off and watch the filaments and see if they are instantly on and stay on. The HV is monitored on the meter and should b
/archives//html/Amps/2015-01/msg00215.html (10,556 bytes)

89. Re: [Amps] 5 Minutes for Ameritron 811H to warm up? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 23 Jan 2015 11:32:06 -0500
Last time I looked the Chinese rated it at 1250V; when they reach the rest of the world the sellers and amp manufacturers rate them as a 1950's era RCA. Then some make believe engineer blames the tub
/archives//html/Amps/2015-01/msg00216.html (11,528 bytes)

90. Re: [Amps] Active Antenna Tuner (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 23 Jan 2015 11:35:52 -0500
Most all amps without fussy shutdown circuits will do that. The problem is when fussy tubes are used and clueless hams don't know how to tune and watch grid or screen current. Using two hands plus wa
/archives//html/Amps/2015-01/msg00217.html (8,079 bytes)

91. Re: [Amps] amp reading (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 23 Jan 2015 19:24:01 -0500
Many just wind their own and experiment until they get the correct voltage. Most overvoltage is due to amps designed in the 60's and 70's when the AC line was 117/234; now it is often as high as 125/
/archives//html/Amps/2015-01/msg00224.html (8,588 bytes)

92. Re: [Amps] 5 Minutes for Ameritron 811H to warm up? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 23 Jan 2015 21:46:31 -0500
-- ORIGINAL MESSAGE --(may be snipped) Consequently a matched pair or quad set of reputable brand vintage NOS 811A / 572B tubes are worth their weight in gold....and highly sought after. REPLY: It b
/archives//html/Amps/2015-01/msg00230.html (11,386 bytes)

93. Re: [Amps] 5 Minutes for Ameritron 811H to warm up? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 24 Jan 2015 11:19:29 -0500
-- ORIGINAL MESSAGE --(may be snipped) Just food for thought. REPLY: All the currently manufactured high-end amps I am aware of use ceramic tubes (or transistors). Also food for thought. I will gran
/archives//html/Amps/2015-01/msg00246.html (10,804 bytes)

94. Re: [Amps] ceramic vs glass (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 24 Jan 2015 11:19:33 -0500
I don't know where you get those numbers from but they are obviously improperly weighted. First of all the 3-500 fan amps far outnumber the ones with chimneys by a huge amount, the SB-220/221/HL-2200
/archives//html/Amps/2015-01/msg00247.html (13,557 bytes)

95. Re: [Amps] ceramic vs glass (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 24 Jan 2015 13:52:09 -0500
Those old 30's era tubes with very low mu did not make very good SSB linears. Even as a teenager I knew better than to use my PP 250TH AM/CW amp on SSB after an appropriate bias change. I had a good
/archives//html/Amps/2015-01/msg00255.html (17,942 bytes)

96. Re: [Amps] ceramic vs glass (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 24 Jan 2015 13:52:11 -0500
I didn't mention any numbers. If I did I would have pulled them out my butt like most do. ** Unfortunately that is true. I really don't know where you would find any reliable data on it other then p
/archives//html/Amps/2015-01/msg00256.html (18,252 bytes)

97. Re: [Amps] amp reading (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 24 Jan 2015 19:34:51 -0500
Ive used that also when nothing else was handy. Carl KM1H Small gauge teflon insulated wire. 73, Roger One of the things I wonder about is how you add a resistor to the filament lead since it seems i
/archives//html/Amps/2015-01/msg00260.html (9,537 bytes)

98. Re: [Amps] ceramic vs glass (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 24 Jan 2015 19:46:59 -0500
Carl, you must really enjoy hosing down the decks with testosterone. It seems to be a pattern. When things turn a bit off for you, you get personnel. So be it, that is your style. ** Nice try at dam
/archives//html/Amps/2015-01/msg00261.html (23,369 bytes)

99. Re: [Amps] What 811A's Should I Try to Find? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 25 Jan 2015 08:54:43 -0500
Any USA brand, RCA, GE, Raytheon, KenRad, Cetron, etc. Go for the latest date codes into the 70-80's. Ive seen them mixed up in the 30L1 used by the USAF so Im half assuming they are all built to clo
/archives//html/Amps/2015-01/msg00270.html (8,492 bytes)

100. Re: [Amps] ceramic vs glass (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 25 Jan 2015 11:18:06 -0500
With minimal work even the Clipperton L/Clipperton QRO will run 1000-1200W 160-10M. The late L's and all QRO's have a built in tuned input. About $400-500 for a good one if you shop. Operated sanely
/archives//html/Amps/2015-01/msg00273.html (12,082 bytes)

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