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References: [ +from:elespe@lisco.com: 160 ]

Total 160 documents matching your query.

141. Re: [Amps] Glitch resistor (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Mon, 14 Nov 2016 20:27:19 -0600
I read somewhere a "rule of thumb" is 10 ohm 10watt per 1kv So an SB220 "needs" three of that and like it was mentioned should be the good quality pulse rated type power resistor. Ameritron sells one
/archives//html/Amps/2016-11/msg00045.html (9,449 bytes)

142. [Amps] L7 problems (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Thu, 8 Dec 2016 20:52:20 -0600
Group I have an L7 that was sent to me for repair and I am getting nowhere with it. The problem is the grid meter has a small negative reading in standby even with NO tubes installed. If the antenna
/archives//html/Amps/2016-12/msg00205.html (7,448 bytes)

143. Re: [Amps] triode vs tetrode (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Fri, 9 Dec 2016 19:43:30 -0600
I recall a article in QST or CQ a long time ago something to do with tapping the screen on the filament choke to improve using tetrodes in gg? Written by the two Eimac engineers but can't find it the
/archives//html/Amps/2016-12/msg00240.html (9,468 bytes)

144. Re: [Amps] L7 problems (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Fri, 9 Dec 2016 20:10:42 -0600
Jim Good to hear from you. I was hoping you would have comments. I had already made the change on the keying going to a 100K 5w and series string of 1N5408 in ct for bias. The relay shorts the resist
/archives//html/Amps/2016-12/msg00242.html (14,016 bytes)

145. [Amps] L7 FIXED (was L7 problems) (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Sun, 11 Dec 2016 11:08:53 -0600
The L7 amplifier with the negative grid current on standby has been repaired and tested. The problem was not the transformer I was suspecting but rather one of the 0.05mfd disc ceramic filament bypas
/archives//html/Amps/2016-12/msg00268.html (7,998 bytes)

146. Re: [Amps] Problem with my Henry 2K-4A (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Wed, 8 Nov 2017 08:55:33 -0600
I've seen negative grid current on Drake amps when one of the filament bypass capacitors is leaky Paul K0UYA Every time I've seen negative grid current it was due to a shorted tube. You might try tak
/archives//html/Amps/2017-11/msg00065.html (10,074 bytes)

147. Re: [Amps] Glitch resistor + fuse? (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Mon, 13 Nov 2017 10:36:47 -0600
The lo ohm resistor Drake used as a fuse in the hv lead works very well. Harbach has them I have ended up putting one in every amp I have followed by conventional glitch protection. Paul K0UYA Hello
/archives//html/Amps/2017-11/msg00141.html (9,464 bytes)

148. Re: [Amps] MFJ products (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Wed, 6 Dec 2017 16:58:08 -0600
Does anyone have comments pertinent to using the MFJ-4403 power conditioner following either linear or switching supplies? These claim to protect against overvoltage? A good idea or just more stuff t
/archives//html/Amps/2017-12/msg00049.html (11,690 bytes)

149. [Amps] Hsu linear (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Tue, 26 Dec 2017 21:28:55 -0600
Does anyone know if Hsu is still marketing that sweet looking legal limit amp? Havent seen them on ebay lately. Anybody have one? Paul K0UYA _______________________________________________ Amps maili
/archives//html/Amps/2017-12/msg00168.html (6,132 bytes)

150. Re: [Amps] Need Fan for amp (score: 1)
Author: "Paul Kraemer" <elespe@lisco.com>
Date: Thu, 11 Jan 2018 16:27:22 -0600
John I have used this fan for replacement in that amplifier https://www.ebay.com/itm/NEW-110-CFM-Axial-Muffin-Fan-Super-Blower-Fireplace-120mm-AC-4-HS1238A/331814400258?hash=item4d41adf102:g:GGQAAOSw
/archives//html/Amps/2018-01/msg00066.html (8,454 bytes)

151. [Amps] AL80A vs AL80B (score: 1)
Author: Paul Kraemer <elespe@lisco.com>
Date: Mon, 4 Feb 2019 14:19:00 -0600
Can someone please tell me the difference between A and B? Thanks Paul K0UYA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/
/archives//html/Amps/2019-02/msg00018.html (6,158 bytes)

152. [Amps] disc ceramic capitors (score: 1)
Author: Paul Kraemer <elespe@lisco.com>
Date: Thu, 18 Apr 2019 17:08:39 -0500
What parameters or characteristics should one seek out when selecting disc ceramic caps for power rf applications such as plate coupling and padder caps used on the pi network. I am assuming just buy
/archives//html/Amps/2019-04/msg00042.html (6,526 bytes)

153. [Amps] HV rectifier (score: 1)
Author: Paul Kraemer <elespe@lisco.com>
Date: Thu, 27 Jun 2019 22:04:43 -0500
I found a couple hv rectifier blocks in my stash but unable to id them.  General Electric logo part no. 4JA421MX55. Any help?  They are 1" square by 5.5" long with terminals on top, one at each end.
/archives//html/Amps/2019-06/msg00069.html (6,531 bytes)

154. [Amps] shorted 3-500 (score: 1)
Author: Paul Kraemer <elespe@lisco.com>
Date: Sat, 12 Oct 2019 11:16:58 -0500
Does anyone have a restoration technique to remove a grid cathode short on a 3-500Z? I have on just laying here--don't know why I keep it.  Filament still lights.  No plate to anything short.  Free f
/archives//html/Amps/2019-10/msg00052.html (6,392 bytes)

155. Re: [Amps] shorted 3-500 (score: 1)
Author: Paul Kraemer <elespe@lisco.com>
Date: Sat, 12 Oct 2019 16:18:35 -0500
No I can't see that.  The tube "looks like" an EIMAC but not sure about that.  Lettering gone. Paul K0UYA Does anyone have a restoration technique to remove a grid cathode short on a 3-500Z? I have o
/archives//html/Amps/2019-10/msg00055.html (7,670 bytes)

156. Re: [Amps] SB220 Meter blown...follow up hope (score: 1)
Author: Paul Kraemer <elespe@lisco.com>
Date: Fri, 15 May 2020 14:12:57 -0500
That will certainly test the meter movement!  It will pin hard once that then you will know it is bad. NEVER TEST A METER MOVEMENT WITH A OHMMETER! Paul K0UYA With nothing else to loose IT removed th
/archives//html/Amps/2020-05/msg00016.html (11,373 bytes)

157. [Amps] Hsu linear (score: 1)
Author: elespe@lisco.com
Date: Thu, 29 Jul 2021 12:42:20 -0500
What ever happened to the awesome linear I believe Hsu was the builder? I believe it used ceramic tetrode fu728? Anybody have one of these amps? Maybe for sale? Thanks Paul K9UYA ____________________
/archives//html/Amps/2021-07/msg00086.html (6,133 bytes)

158. [Amps] solid state amp ? (score: 1)
Author: Paul Kraemer <elespe@lisco.com>
Date: Sat, 25 Sep 2021 16:04:23 -0500
I have decided after 60+ years  in the hobby it may be time to try a solid state linear. I have been looking at ACOM 1200S and RZ1ZR Mercury 3S as possibilities within my price range.  The Mercury re
/archives//html/Amps/2021-09/msg00015.html (6,853 bytes)

159. [Amps] W7RY QSK boards (score: 1)
Author: Paul Kraemer <elespe@lisco.com>
Date: Fri, 8 Oct 2021 10:54:48 -0500
I am looking for W7RY QSK board for the L4B / L7 amplifier or a schematic of same. I have tried a lot of internet searches with no luck.  I have tried contacting Jim at the email listed on QRZ with n
/archives//html/Amps/2021-10/msg00002.html (6,749 bytes)

160. Re: [Amps] Actuating a 120 VDC relay with low voltage (score: 1)
Author: Paul Kraemer <elespe@lisco.com>
Date: Mon, 26 Dec 2022 20:16:45 -0600
FWIW Jeff at Harbach no longer has the keyer.  I have one and wish I could get another.  I also have used the Ameritron ARB version.  Recently found yet another one on ebay it is a simple relay in a
/archives//html/Amps/2022-12/msg00118.html (9,321 bytes)

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