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181. Re: [Amps] Amplifier for 630 meter band (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Fri, 10 Nov 2017 21:48:47 -0500
I was thinking of one of the more linear pro audio products. Like Crown, UREI, QSC.  I suspect that musical instrument amps may have more distortion that will require more filtering.  But ya never kn
/archives//html/Amps/2017-11/msg00111.html (9,941 bytes)

182. Re: [Amps] Rotary switch terminology (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Mon, 27 Nov 2017 06:35:46 -0500
Looking for help on naming of switch types. In the field of rotary switches If the pole rotates between contacts in a break before make manner how would you name this? "break before make" type (most
/archives//html/Amps/2017-11/msg00210.html (8,073 bytes)

183. Re: [Amps] Henry 2k-4 HV inductor (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 12 Dec 2017 16:28:08 -0500
Hi Elliott W6EL L: I recently purchased a Henry 2k-4 with a high-voltage fault. The fault has been traced to the inductor, L201, which is located directly after the bridge rectifier. The value, accor
/archives//html/Amps/2017-12/msg00091.html (7,794 bytes)

184. Re: [Amps] Henry 2k-4 HV inductor (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Wed, 13 Dec 2017 21:16:22 -0500
/* snip */ 1950s. IF the choke and parallel resonating cap just happen to resonate at 120 hz, the peak V across that parallel tuned choke will skyrocket, and both the cap and choke will explode. Typ
/archives//html/Amps/2017-12/msg00098.html (8,609 bytes)

185. Re: [Amps] Henry 2k-4 HV inductor (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Fri, 22 Dec 2017 08:37:01 -0500
Alright, there were some really interesting comments on this question, thank you all! If I were to ditch the hV choke and keep the plate transformer, can I simply add additional caps in parallel wit
/archives//html/Amps/2017-12/msg00117.html (10,038 bytes)

186. Re: [Amps] Defining CCS (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sun, 31 Dec 2017 20:20:32 -0500
Jim VE7RF Thomson wrote: {in part} <Helpful to who?? Communication by whom, of what, precisely?? I would suggest our discussions on these forums and to teach our newbies. -- Ron KA4INM - Youvan's cor
/archives//html/Amps/2017-12/msg00212.html (8,525 bytes)

187. Re: [Amps] Amp for 444 mHz (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Wed, 7 Mar 2018 13:07:50 -0500
I've downloaded the paper, which is relevant not just to this project, but to our operations in general. At the time of the year when rains (and thunderstorms) haven't quite started, the wind accumu
/archives//html/Amps/2018-03/msg00023.html (9,184 bytes)

188. Re: [Amps] GS35B Idle current increasing (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sat, 10 Mar 2018 13:06:55 -0500
I built a GS35B amp a few years back to be used with my home brew AM rigs. Initially I set the idle current at around 110mA/4KV requiring about -35V bias. Over a few years of very little use the idle
/archives//html/Amps/2018-03/msg00030.html (8,571 bytes)

189. Re: [Amps] Russian capacitor kbap ratings to current? (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 8 May 2018 05:59:52 -0400
I have several 470pF @ 15kV RF doorknob caps that have a 40kbap rating. Seller says the kbap markings are the same as our kvar. How do I calculate the maximum RF current these can handle? Is this th
/archives//html/Amps/2018-05/msg00015.html (8,657 bytes)

190. Re: [Amps] parasitic suppressor for six meters (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Mon, 16 Jul 2018 12:21:25 -0400
I'm thinking about replacing the two burned resistors with a single 22 ohm 5 Watt metal film resistor, and trimming the inductor to a single turn. Does this seem a reasonable change? Does the tube r
/archives//html/Amps/2018-07/msg00049.html (9,692 bytes)

191. Re: [Amps] Alpha 87A problems (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Wed, 3 Oct 2018 07:48:44 -0400
"IMHO uPC hardware to control a QRO tube amplifier is anathema and only works when executed adroitly and with a whole bunch of design provisos and inbuilt protections to make the scheme robustly bul
/archives//html/Amps/2018-10/msg00014.html (9,243 bytes)

192. Re: [Amps] Flex Power Genius XL 2KW amplifier (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Wed, 17 Oct 2018 09:34:19 -0400
It would be interesting to d a study and see just how many CW op's actually work QSK. I've been on CW since '54 and have never used it (except back in my CW traffic days with a separate antenna on t
/archives//html/Amps/2018-10/msg00061.html (10,904 bytes)

193. Re: [Amps] Super Cathode Driven Tetrodes (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Mon, 29 Oct 2018 12:35:29 -0400
Now that this discussion has gone on for some time, and everyone has had a opportunity to read various articles, here is the question. Can anyone give me a reason why a cathode driven tetrode with th
/archives//html/Amps/2018-10/msg00106.html (10,016 bytes)

194. Re: [Amps] heat sinks (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Fri, 16 Nov 2018 11:26:29 -0500
Anyone got a good source of aluminum heat sink stock? I know about Heatsink USA. Their prices are steep but not prohibitive. Unfortunately by the time I add on the shipping and handling charges, it
/archives//html/Amps/2018-11/msg00055.html (8,068 bytes)

195. Re: [Amps] SB-220 Problem has me stumped, looking for some guidance on what to look at next (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 15 Jan 2019 18:11:48 -0500
I bought a SB-220 as a project at Hamvention in Ohio, I think I paid about 400 dollars for it, It was pretty dirty but complete. I wanted to restore one of these to compliment my SB200 that I have a
/archives//html/Amps/2019-01/msg00076.html (11,231 bytes)

196. Re: [Amps] 15 kv CRL 859 capacitor question (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 22 Jan 2019 09:01:53 -0500
I have a pair of 500 pf CRL 859 15kv capacitors that were removed from a 3CX3000 amp.They measure 746 and 731 on my tester. The tester seems pretty accurate on the other ones I have checked. These w
/archives//html/Amps/2019-01/msg00100.html (7,839 bytes)

197. Re: [Amps] Different versions of 3-500 tubes in amp (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Wed, 23 Jan 2019 08:42:02 -0500
I've decided one of the two tubes in my SB-220 is weak and I'd like to get a replacement. Right now both are original Eimac tubes with the non-graphite anode but I see most replacements are graphite
/archives//html/Amps/2019-01/msg00109.html (8,203 bytes)

198. Re: [Amps] HV rectifier diodes (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sun, 27 Jan 2019 21:28:07 -0500
When I joined the list, it was to get the skinny on solid state amps, little did I realize that my tube type amp would die and I'd be consulting the list for hV diode suggestions and vendors. But: I
/archives//html/Amps/2019-01/msg00151.html (10,215 bytes)

199. Re: [Amps] DIGITAL BARGRAPH DISPLAYS (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Tue, 19 Feb 2019 16:40:15 -0500
If I were building a new HF amplifier I would be tempted to incorporate a meter and dual directional coupler /* snip */ and I would make it so an increasing reflected power value would cause the ALC
/archives//html/Amps/2019-02/msg00054.html (8,805 bytes)

200. Re: [Amps] DIGITAL BARGRAPH DISPLAYS (score: 1)
Author: Ron Youvan <ka4inm@gmail.com>
Date: Sun, 24 Feb 2019 13:12:10 -0500
  /* snip */   and I would make it so an increasing reflected power value would cause the ALC to back off the drive, I think every H. P. amplifier should do that. Why? For what reason? Just re-tune.
/archives//html/Amps/2019-02/msg00056.html (9,617 bytes)

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