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141. Re: [Amps] time to death... (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 11 Nov 2010 11:49:38 -0600
Roy, That's a good idea. But I can't see my exhaust port as the amp fits into a shelving arrangement. And at 5:00 AM on the 2nd day of the 48 hours, I think a flashing red light and yelp-type siren m
/archives//html/Amps/2010-11/msg00155.html (7,536 bytes)

142. Re: [Amps] time to death... (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 11 Nov 2010 14:29:34 -0600
Great story Colin and Roger. This redundancy thing can be taken to infinity. Fortunately, the only life threating situation this amp provides is when I have my fingers poking around in it's guts. For
/archives//html/Amps/2010-11/msg00160.html (12,034 bytes)

143. Re: [Amps] WTB RJ1A vacuum relay (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 14 Nov 2010 22:19:59 -0600
He sells the new GV units as well. 73, Jeff ACØC www.ac0c.com --Original Message-- From: Jim W7RY Sent: Sunday, November 14, 2010 3:38 PM To: jim@audiosystemsgroup.com ; amps@contesting.com Subject:
/archives//html/Amps/2010-11/msg00237.html (9,641 bytes)

144. Re: [Amps] Tube Cooling (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Tue, 23 Nov 2010 15:24:47 -0600
Unless the amp is in a constant mode service (FM/AM/RTTY), most any cooling solution will be adequate. The tube is incredibly rugged. The contact point for the anode coolers is about a 2/3" flat surf
/archives//html/Amps/2010-11/msg00406.html (9,159 bytes)

145. Re: [Amps] 1800 Watt Henry 2K4? (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Tue, 23 Nov 2010 20:27:21 -0600
Not if you are measuring instantaneous peak pulsed power when doing this test. 73, Jeff ACØC www.ac0c.com Jeremy, A good 2000 watt 50 ohm dummy load is an absolute necessity. Hal -- On Mon, 11/22/10,
/archives//html/Amps/2010-11/msg00408.html (10,088 bytes)

146. Re: [Amps] 1800 Watt Henry 2K4? (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Wed, 24 Nov 2010 02:26:43 -0600
You are right of course. My comment was intended to be a joke. 73, Jeff ACØC www.ac0c.com Not when you don't have the voltage and current capability in the tubes. 73 Roger (K8RI) ____________________
/archives//html/Amps/2010-11/msg00412.html (12,068 bytes)

147. Re: [Amps] Don't do this (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 19 Dec 2010 20:22:16 -0600
Jim, You will find this hard to believe. But it's true. I managed to drop a probe tied to B+ (about 2400V at the time) onto the SB200 meter lead. Fortunately, there were some huge diodes back to back
/archives//html/Amps/2010-12/msg00266.html (11,312 bytes)

148. Re: [Amps] Cracked Chimney (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sat, 25 Dec 2010 20:45:16 -0600
I would be worried about using a plastic around this tube where the HDT (heat deformation temp) is unknown - the "problem" with the glass tubes is that a good amount of their disipation is by radiati
/archives//html/Amps/2010-12/msg00364.html (11,044 bytes)

149. Re: [Amps] 572B AMP PLANS (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 26 Dec 2010 17:19:18 -0600
I cannot think of a single reason, that means zero reasons, to build with a 572b. The GI7B is a far far far far far superior tube (did I say far superior? hi hi) than the 572b. And all the rest of th
/archives//html/Amps/2010-12/msg00381.html (10,231 bytes)

150. Re: [Amps] 572B AMP PLANS (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 26 Dec 2010 19:13:00 -0600
Hsu, No idea. I tried to kill one pair. But there were other weakness of the amp (or rather, the age of the amp), which caused the last failure and pushed the amp to backup role (the ancient bandswit
/archives//html/Amps/2010-12/msg00383.html (10,896 bytes)

151. Re: [Amps] 572B AMP PLANS (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 26 Dec 2010 19:32:37 -0600
Mike, I did a test once. I told the amp verbally, we were going to run ssb, and it (with drive applied) - it ran 700W out on 40m. Then I told it verbally, it was time to run ssb. And it did, with dri
/archives//html/Amps/2010-12/msg00386.html (12,350 bytes)

152. Re: [Amps] 572B AMP PLANS (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 26 Dec 2010 22:06:08 -0600
Hsu, The 813 looks nice. But I am very impressed with the GI7B. I really work that tube hard - both in the RTTY contesting and on the bench (one time, I ran the pair for 20 minutes key down at rated
/archives//html/Amps/2010-12/msg00389.html (13,464 bytes)

153. Re: [Amps] 572B AMP PLANS (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Mon, 27 Dec 2010 03:13:17 -0600
To my thinking, a single GI35b beats 4x GI7b for about anything. In fact, a single GI35b beats a pair of GI7b - if a guy has the space. The GI7b are nice because of the small size and sometimes, ther
/archives//html/Amps/2010-12/msg00393.html (16,935 bytes)

154. Re: [Amps] GS35B Needed (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Wed, 29 Dec 2010 14:56:34 -0600
The tube is pretty rugged. But that's a new type of stress test! QRO-parts.com ships from TX. 73, Jeff ACØC www.ac0c.com Well Cristmas is over , Hope everyone had a great holiday, only one casualty h
/archives//html/Amps/2010-12/msg00401.html (11,245 bytes)

155. Re: [Amps] GI-7bT amplifier (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Tue, 11 Jan 2011 12:43:55 -0600
Glen, At this plate voltage of 1800-2000 volts, you will end up having pretty high drive requirements and that means a lot more punishment to the grids - however strong or weak as they may be. The tu
/archives//html/Amps/2011-01/msg00125.html (13,278 bytes)

156. Re: [Amps] Transformer advice (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 13 Jan 2011 17:34:36 -0600
I had a custom built by EPD as well. Turned out excellently. Peter is the guy to talk to there for any special needs applications. He's an old-school Swiss (I think) engineer. They were the only comp
/archives//html/Amps/2011-01/msg00139.html (8,619 bytes)

157. Re: [Amps] What to buy? (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 27 Jan 2011 11:12:00 -0600
Specufic to the Alpha products, in the serious 1500 w capability class, the Alpha 8410 (dual hole) amp is a good choice in the manual-tune category. This is off their "commercial" line variation wher
/archives//html/Amps/2011-01/msg00364.html (9,575 bytes)

158. Re: [Amps] Alpha 76CA Operation (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 27 Jan 2011 12:00:11 -0600
Frank, I put an 76pa into service a couple of months ago - it also had some flaky characteristics similar to what you mention. Turns out it was what looked like cold and/or missing solder on some of
/archives//html/Amps/2011-01/msg00368.html (10,018 bytes)

159. Re: [Amps] What to buy? (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 30 Jan 2011 13:54:36 -0600
Friend of mine has the QRO 2500 with the similar problems on the low end. Melted toroid mounts. The amp seems otherwise very strong. Just that toroid tank configuration seems to have a weak spot of s
/archives//html/Amps/2011-01/msg00442.html (10,056 bytes)

160. Re: [Amps] I answered it. (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 30 Jan 2011 14:29:05 -0600
Gary, It depends on the band that is giving the trouble. And what works for one guy may not work for another. I run an all all-attic stealth installation here at KW power levels - in a residential ne
/archives//html/Amps/2011-01/msg00444.html (11,592 bytes)

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