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References: [ +from:g3sek@ifwtech.co.uk: 291 ]

Total 291 documents matching your query.

201. Re: [Amps] Line Isolators for RF feedback (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sat, 7 Aug 2004 09:18:51 +0100
R. Measures wrote: I'll stick with my bead balun -- it fixed all the RF problems I was having, so unless it bursts into flames, I'll keep it!! Joe -- the only problems that I have heard of is the fer
/archives//html/Amps/2004-08/msg00065.html (11,291 bytes)

202. Re: [Amps] Line Isolators for RF feedback (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sat, 7 Aug 2004 10:28:03 +0100
Following-up my previous message... Over its "wideband" region, a ferrite bead becomes increasingly resistive as well as inductive. The resistive losses in each bead will be I-squared*R and these wil
/archives//html/Amps/2004-08/msg00066.html (9,338 bytes)

203. Re: [Amps] Line Isolators for RF feedback (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sun, 8 Aug 2004 11:37:17 +0100
R. Measures wrote: Joe -- the only problems that I have heard of is the ferrite beads getting so hot they cracked and dropped off. This is hardly surprising since the ferrite material that is typical
/archives//html/Amps/2004-08/msg00070.html (11,669 bytes)

204. Re: [Amps] Filtering capacitor in a HV PS: How low can you getawaywith? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 16 Aug 2004 18:16:14 +0100
Angel Vilaseca wrote: I am building a 2500 V power supply for a one-KW transmitter. It will use 2 4CX20Bs. I have two oil-filled capacitors: 2.5 KV 40 uF and a 4 KV 25 uF. I feel quite uncomfortable
/archives//html/Amps/2004-08/msg00158.html (9,063 bytes)

205. Re: [Amps] Filter-C (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Wed, 18 Aug 2004 08:15:18 +0100
R. Measures wrote: RE: Filter-C, how much is enough? A friend of mine built a 4-1000A/8166 g-g amplifier that ran c. 6500v on the anode from a FWB rectifier/C-filter. The only filter-C he had on hand
/archives//html/Amps/2004-08/msg00188.html (10,350 bytes)

206. Re: [Amps] Centurion cooling improvement ideas for AM service (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 26 Aug 2004 08:18:43 +0100
Will Matney wrote: The Fluke Model 61 is $109. It shines a laser beam where it is measuring the temp. http://www.newark.com/product-details/text/CD121/49571.html Will miracles never cease! I never th
/archives//html/Amps/2004-08/msg00326.html (13,006 bytes)

207. Re: [Amps] AL-1500 pi-network capabilities (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 31 Aug 2004 08:31:06 +0100
Will Matney wrote: Another good coil can be made by using a wide copper strip about 5/8" wide and about 1/16" thick. Plating, etc. helps this too, and this can be a good substitute for using tubing.
/archives//html/Amps/2004-08/msg00474.html (8,788 bytes)

208. Re: [Amps] re cooling of coils (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 6 Sep 2004 08:00:34 +0100
Will Matney wrote: What is poor, is those junky 11 meter solid-state "contesting amps" floating around with better cooling than any amateur amplifier made now! The innards may be junk, but by cracky
/archives//html/Amps/2004-09/msg00102.html (10,058 bytes)

209. Re: [Amps] Re: re cooling of coils (Ian White, G3SEK) (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 6 Sep 2004 10:01:34 +0100
Will Matney wrote: Ian, I would think a set of louvered holes at the input for the blower air in the chassis would do it. That is if they were aimed in different directions from one to the other. Thi
/archives//html/Amps/2004-09/msg00106.html (8,076 bytes)

210. Re: [Amps] re cooling of coils (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 6 Sep 2004 10:06:23 +0100
Traian wrote: As I know, the sodium is used for heat transfer for some power plant nuclear reactors also?!... Yup - and then they use water/sodium heat exchangers. On one side of a very thin sheet of
/archives//html/Amps/2004-09/msg00107.html (8,946 bytes)

211. Re: [Amps] New Panasonic Tube Radio (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 7 Sep 2004 09:05:15 +0100
Ridiculous, its quite obvious that they put in a single 12AX7 stage feeding a SS amp and call it a tube unit. Nothing but a novelty really. There's one "tube" guitar amp that takes this a step furthe
/archives//html/Amps/2004-09/msg00152.html (8,936 bytes)

212. Re: [Amps] re cooling of coils (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 7 Sep 2004 10:40:06 +0100
W0UN -- John Brosnahan wrote: I don't know what type of fan they supply, but low-noise Muffin-type fans are available that are at least 10dB quieter than the regular type. RE: QUIET MUFFIN FANS Ian--
/archives//html/Amps/2004-09/msg00153.html (11,800 bytes)

213. Re: [BULK] - [Amps] 2m Linear Amp Enquiry (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Fri, 10 Sep 2004 10:25:00 +0100
Steve Thompson wrote: Search around for the W2GN design using a pair in parallel, it works a treat. I modified the grid circuit to have separate bias control, so it will work with unmatched tubes. Pe
/archives//html/Amps/2004-09/msg00183.html (8,628 bytes)

214. Re: [Amps] Equalising resistors with HV diodes (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 21 Sep 2004 16:49:39 +0100
The avalanche characteristic is built-in at the time of epitaxy. Are your pet diodes (1N5408) characterized in avalanche? I researched this for the magazine column in 1997, including direct correspon
/archives//html/Amps/2004-09/msg00381.html (12,034 bytes)

215. Re: [Amps] Re: Equalizing resistors with HV diodes (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Wed, 22 Sep 2004 10:28:14 +0100
RZP wrote: G8WRB said: the rate of metal migration would decrease exponentially with increasing thickness There is a limit to how thick you can deposit metal. The Unitrode process, which uses the end
/archives//html/Amps/2004-09/msg00398.html (9,955 bytes)

216. Re: [Amps] L4B HV diodes (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 5 Oct 2004 08:30:06 +0100
Will M wrote: Not necessarily, you may get by with replacing the one diode with the 1N5408. I think the 1N5406 is the 600 V, 3 amp. They should all have a drop of about 0.7 volts a piece. I only foun
/archives//html/Amps/2004-10/msg00043.html (8,702 bytes)

217. Re: [Amps] Linearity metering (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Fri, 8 Oct 2004 09:27:10 +0100
Jason Buchanan wrote: I noticed in the 1972/1973 ARRL handbooks that I have there is a 4-1000A amplifier project with a linearity metering circuit. Look for the SS-2000 project. This seems like an in
/archives//html/Amps/2004-10/msg00087.html (10,378 bytes)

218. Re: [Amps] Transformer shop update (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Fri, 8 Oct 2004 10:03:52 +0100
Will accidentally replied to my e-mail on-list. Not a problem, but there is one point that I'd like to clear up before taking this back to e-mail... Ian, [...] The voltages I shown for the screen was
/archives//html/Amps/2004-10/msg00089.html (9,756 bytes)

219. [Amps] NOT ifwtech.com (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 12 Oct 2004 14:01:38 +0100
Sorry for the bandwidth, but... Please note: my former ifwtech.com domain is NOT under my control any more. I lost that domain name 3 years ago, due to my ISP's careless failure to renew it. Fortunat
/archives//html/Amps/2004-10/msg00170.html (8,050 bytes)

220. Re: [Amps] Chimneys for Russian tubes (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 12 Oct 2004 23:31:09 +0100
Paul Whatton wrote: Hi all, I'd appreciate some advice. I'm building an amp with a pair of GI-7bs and will be blowing into the anode compartment and using two PTFE chimneys in the usual (K2RIW) way v
/archives//html/Amps/2004-10/msg00192.html (8,524 bytes)

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