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101. [Amps] typical leakage hi-pot measurements (score: 1)
Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>
Date: Sat, 3 Jul 2010 12:45:47 -0500
I've got a pair of 74b's to check out for a buddy on the hi-pot out of his QRO 2500. Wondered what typical breakdown voltage points would be for the various combinations of tube elements? 73/jeff/ac0
/archives//html/Amps/2010-07/msg00046.html (6,518 bytes)

102. Re: [Amps] QSK-1500 chip (score: 1)
Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>
Date: Wed, 7 Jul 2010 18:31:38 -0500
Would a CD4011B instead? I know the TI chip is still available and has diode clamped inputs. $0.40 at Mouser. 73/jeff/ac0c www.ac0c.com _______________________________________________ Amps mailing li
/archives//html/Amps/2010-07/msg00074.html (7,984 bytes)

103. Re: [Amps] QSK-1500 chip (score: 1)
Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>
Date: Wed, 7 Jul 2010 19:31:04 -0500
Joe, Thanks for the comment. Tough for me to imagine because the device's switching speed is going to be the low tens of nS range - and the rest of the "ham stuff" with respect to switching is going
/archives//html/Amps/2010-07/msg00076.html (12,546 bytes)

104. Re: [Amps] QSK-1500 chip (score: 1)
Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>
Date: Wed, 7 Jul 2010 21:36:59 -0500
Joel, I saw the comments on the schematic. Interesting. PINs are quiet and fast but wow, easy to fry if you were to inadvertently to behave badly. :) Relays on the QT here for me. The good news is th
/archives//html/Amps/2010-07/msg00079.html (15,850 bytes)

105. Re: [Amps] Check out This Ebay Amplifier system (score: 1)
Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>
Date: Fri, 9 Jul 2010 01:06:52 -0500
When you are good - you are good!!! 73/jeff/ac0c www.ac0c.com _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-07/msg00093.html (11,635 bytes)

106. Re: [Amps] Input impedance question (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Tue, 27 Jul 2010 13:08:34 -0500
Dave, Ballpark is right. You will have to hand tune it once the thing is together and running at power. The 3x will run somewere in the 20-40 ohms range but in the GG, there is a tremendous dependenc
/archives//html/Amps/2010-07/msg00264.html (8,614 bytes)

107. Re: [Amps] winding toroids (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Fri, 30 Jul 2010 18:05:47 -0500
Toroids work but be sure to dedicate only one toroid per band - don't share the bands fractionally. I made a mistake in my first build sharing one toroid for 40/80 duty. On 40, the few turns covering
/archives//html/Amps/2010-07/msg00363.html (9,442 bytes)

108. Re: [Amps] New HF amplifier (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Mon, 2 Aug 2010 16:57:08 -0500
Larry, This is true that toroids with partial windings used are fine - if the core power dissipation and local flux density limits don't exceed the capability of the core. For a project here, I would
/archives//html/Amps/2010-08/msg00007.html (9,888 bytes)

109. Re: [Amps] New HF amplifier (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Wed, 4 Aug 2010 20:52:33 -0500
Denny, I believe that was Larry's point also. It's certainly my observation here. Does not take much of that power floating around in the cores to warm those babys up either. :) 73/jeff/ac0c www.ac0c
/archives//html/Amps/2010-08/msg00037.html (9,543 bytes)

110. Re: [Amps] Automotive Relays (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Fri, 6 Aug 2010 13:50:29 -0500
Carl, That relay is available in a 24V version. And there's a 16A contacts rating option as well which may be the better choice especially if a guy is running at the full AUS/NZ-400w power level inst
/archives//html/Amps/2010-08/msg00061.html (12,620 bytes)

111. Re: [Amps] Automotive Relays (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Fri, 6 Aug 2010 14:37:46 -0500
Carl, you are right. 400.000 W. So if that 12A version is good for a US 1500W, then the 16A version may be marginally acceptable for a guy running the AUS 400W. Now that I think of it, 2-3 in paralle
/archives//html/Amps/2010-08/msg00064.html (14,971 bytes)

112. Re: [Amps] Automotive Relays (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sat, 7 Aug 2010 00:35:13 -0500
Mike, I would like to have said that using them in my case was due to some superhuman research attempt. But I just noticed that these were the relays in my Ameritron remote antenna switch. And I chec
/archives//html/Amps/2010-08/msg00074.html (19,401 bytes)

113. Re: [Amps] Comparison of PCB-mount RF relays (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sat, 7 Aug 2010 01:36:29 -0500
Jim, Excellent work. If you don't mind me saying - I'm having a tough time following the conclusion that the 16A version is necessarily a lesser capable unit than the 12A version. The external pin sp
/archives//html/Amps/2010-08/msg00076.html (13,800 bytes)

114. Re: [Amps] Automotive Relays (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 8 Aug 2010 15:35:00 -0500
I'm running the RCS-10 now for about a year. Most action is RTTY contesting from my micro-pistol station. About 1000-1200W. Of all the things that have exploded, including amps, antennas, coax, traps
/archives//html/Amps/2010-08/msg00095.html (30,068 bytes)

115. Re: [Amps] Automotive Relays (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 8 Aug 2010 15:37:02 -0500
David, Wetting is usually only required with contacts that never see any significant current (like what you may have in a receiver). If it's being used in a transmit capacity, you have an automatic r
/archives//html/Amps/2010-08/msg00096.html (12,360 bytes)

116. Re: [Amps] PCB test for the 12A & 16A power relays (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Mon, 9 Aug 2010 12:15:35 -0500
Fantastic data, Larry. Very interesting... 73/jeff/ac0c www.ac0c.com _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo
/archives//html/Amps/2010-08/msg00119.html (11,218 bytes)

117. Re: [Amps] Can I cool too much the tubes? (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Mon, 16 Aug 2010 12:59:52 -0500
Gentlemen, If I'm not wrong, on the glass tube, there is only an incremental benefit to the air circulation - the anode dissipation happens primarily by radiation, not conduction, and I think that me
/archives//html/Amps/2010-08/msg00258.html (10,362 bytes)

118. Re: [Amps] Can I cool too much the tubes? (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Fri, 20 Aug 2010 11:20:53 -0500
Gentlemen, You should take a look at the plate dissipation at the reduced power levels. In my amp, as the power output drops back, the efficiency drops at a faster rate on some bands. Which means tha
/archives//html/Amps/2010-08/msg00338.html (15,835 bytes)

119. Re: [Amps] triode or tetrode (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Fri, 27 Aug 2010 17:11:43 -0500
Bill, The other "fine point" of a first time amp build - is the mistakes that you make along the way that you don't realize until later. A guy does not really build an amp in a linear fashion. He bui
/archives//html/Amps/2010-08/msg00410.html (10,483 bytes)

120. Re: [Amps] GI-7BT Amplifier Thoughts (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Fri, 27 Aug 2010 17:22:39 -0500
The GI7B is a great tube. 350W plate disipation per hole. I use it for RTTY contesting and have exploded the amp in various ways many times but the tubes just keep on ticking. 1000-1200W out dependin
/archives//html/Amps/2010-08/msg00412.html (9,477 bytes)

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