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141. Re: [Amps] 8875 (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 27 Mar 2015 09:04:49 -0400
Ive explained that several times. Since the MLA-2500 is PS limited there is no sense in using two 3CX800's where a single already gives an extra 200W of PD over a pair of 8875's. Mount a muffin fan o
/archives//html/Amps/2015-03/msg00071.html (11,149 bytes)

142. Re: [Amps] more - oil bath GS-35b (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 31 Mar 2015 21:36:06 -0400
No different than with a transmission cooler, especially a fan cooled external one. Carl KM1H Correct! The faster the oil flow in the tube cooler, the better the cooling. But not so for the radiator.
/archives//html/Amps/2015-04/msg00002.html (9,831 bytes)

143. Re: [Amps] Alpha 76A 3cpx800 Conversion Tuning? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 5 Apr 2015 20:49:01 -0400
Ive done several of those conversions using the Ameritron choke which is sold to/by RFP as their RFC-3, its $5 less in the MFJ catalog. I use a piece of hard Teflon wedged in as a spacer from the blo
/archives//html/Amps/2015-04/msg00038.html (11,852 bytes)

144. Re: [Amps] Fltr Cap Replacement for Henry 2KD-5 Needed (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 12 Apr 2015 08:40:15 -0400
Wow, what a rip-off! Ameritron uses 270uF in the same format at only $13.50 each and has been a standard in the MFJ catalog for some years now. The Mouser ones listed are the Snap-In type and the onl
/archives//html/Amps/2015-04/msg00075.html (10,021 bytes)

145. Re: [Amps] AL-1200 Glitch Resistor (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 12 Apr 2015 08:45:41 -0400
See the photos of the current big Ameritron series. They use a big carbon resistor that is in the parts list, sort of pricey however. Carl KM1H I'm working on an AL-1200 for a friend. While finding t
/archives//html/Amps/2015-04/msg00076.html (8,356 bytes)

146. Re: [Amps] AL-1200 Glitch Resistor (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 12 Apr 2015 09:38:45 -0400
Carl, Any idea when it went into production? I see it in the on-line parts list as P/N 10-10154 for $19.11 but I dont see it on the current PDF schematic. ** No I dont Paul, time flies at my age but
/archives//html/Amps/2015-04/msg00081.html (12,218 bytes)

147. Re: [Amps] LK-500 ZB (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 14 Apr 2015 10:40:18 -0400
A shorted tube wouldnt be drawing positive plate current. Sounds like a gas arc took out the zener and the amp is now zero biased. Look for a glow in the tubes when in standby mode, maybe all they ne
/archives//html/Amps/2015-04/msg00098.html (9,395 bytes)

148. Re: [Amps] Test versus working voltage for oil filled capacitor (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 14 Apr 2015 18:06:40 -0400
Actually they sound totally unsuited for the job at anywhere near the marked voltage, those are energy storage caps for some industrial pulse type of operation as seen by their feather weight. My 51
/archives//html/Amps/2015-04/msg00105.html (9,561 bytes)

149. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 2 May 2015 11:54:02 -0400
The Bird is the Gold Standard since the FCC has accepted it for ham power measurements for far longer than most on here have been alive. It is also the standard for 2 way radio servicemen Hi All, I a
/archives//html/Amps/2015-05/msg00012.html (12,213 bytes)

150. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 2 May 2015 22:06:02 -0400
I have Bird slugs of different power levels thru 2304 mHz plus various attenuators and directional couplers good thru at least 3 gHz. Ive never let an accuracy percentage in any of the parts concern
/archives//html/Amps/2015-05/msg00018.html (16,180 bytes)

151. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 5 May 2015 10:25:11 -0400
I already stated I use a HP 437 with appropriate couplers and attenuators. Ive moved up the 43x food chain over the decades as surplus gear becomes available. Carl KM1H Does anyone use directional co
/archives//html/Amps/2015-05/msg00082.html (11,054 bytes)

152. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 5 May 2015 10:56:30 -0400
-- ORIGINAL MESSAGE --(may be snipped) If you think that is not a true statement, listen to 3840 any evening. There are more F-bombs dropped there than when I worked in the woods. 73 Tom W7WHY REPLY
/archives//html/Amps/2015-05/msg00085.html (10,896 bytes)

153. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 5 May 2015 10:57:47 -0400
I dont even consider it that necessary at any ham or 2 way shop test bench, Bird is still the standard and there are enough slug ranges available for most any need. OTOH those slugs add up in price i
/archives//html/Amps/2015-05/msg00086.html (11,994 bytes)

154. Re: [Amps] 813's (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Wed, 23 Dec 2015 17:23:36 -0500
I save my glow bottles for Class C AM use and as modulators. A couple of 304TL's can really light up the room as can HK-354C's, and 250TH's. Some long years ago I ran a pair of VT-127A's (aka 100TS a
/archives//html/Amps/2015-12/msg00055.html (13,276 bytes)

155. Re: [Amps] 813's (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 24 Dec 2015 11:18:04 -0500
Its not that 250TH's etc dont work but they need a lot more drive due to the low mu, a hefty regulated bias supply voltage wise, and arent much beyond sweep tube for linearity. Ive been sitting on a
/archives//html/Amps/2015-12/msg00059.html (16,349 bytes)

156. Re: [Amps] Need for bias switch (CW/SSB) (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Wed, 13 Jan 2016 12:41:01 -0500
The FCC did it! Originally the rule was 1000W DC input for any mode. Then it changed to 2000W PEP for SSB only so the plate transformer was tapped and a switch added, Some of those older amps have a
/archives//html/Amps/2016-01/msg00008.html (9,504 bytes)

157. Re: [Amps] Need for bias switch (CW/SSB) (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 17 Jan 2016 13:08:33 -0500
The best way to tell if your CW signal is objectionable is to look at it on a spectrum analyzer which is built in to many SDR rigs, find someone running one and ask him. "just" cutoff is a twilight z
/archives//html/Amps/2016-01/msg00023.html (11,039 bytes)

158. Re: [Amps] Need for bias switch (CW/SSB) (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 17 Jan 2016 13:12:59 -0500
Which is why saying Deep Class B signifies a variation and has been used for ages. Real old manuals used B/C Not accurate for a purist but fine for real world use. Carl KM1H Class B is defined as a c
/archives//html/Amps/2016-01/msg00024.html (10,950 bytes)

159. Re: [Amps] SB 220 Exploding Resistor (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 17 Jan 2016 13:19:20 -0500
That blown resistor may have been underated and blew during a tube arc. The idea of a surge suppressor is to not fail and allow the milliseconds for a fuse/breaker to open. A 10-15 Ohm 20-25W Real wi
/archives//html/Amps/2016-01/msg00025.html (9,366 bytes)

160. Re: [Amps] Need for bias switch (CW/SSB) (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 17 Jan 2016 13:27:26 -0500
-100V isnt even close to a full cutoff description since typical operating bias in Class C is -90V for 250B's. Carl KM1H -- Original Message -- From: "RCM" <robrk@nidhog.net> To: <amps@contesting.com
/archives//html/Amps/2016-01/msg00026.html (11,115 bytes)

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