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Total 477 documents matching your query.

341. Re: [Amps] Machlett 3-500Z tubes (score: 1)
Author: Alek Petkovic <>
Date: Sat, 26 Nov 2016 10:43:45 +0800
Same tubes, as far as I'm aware. I imagine that if you buy enough of them and the manufacturer will put your name/logo on them. 73, Alek. VK6APK On 26/11/2016 9:43 AM, Dick NY1E wrote: I need a pair
/archives//html/Amps/2016-11/msg00118.html (7,785 bytes)

342. Re: [Amps] The cost of amplifiers, radios (score: 1)
Author: Alek Petkovic <>
Date: Wed, 07 Dec 2016 05:09:14 +0800
1500W is absolutely true and easily repeatable. I have witnessed it personally, if the LP100A power meter is to be believed. King Conversions do it every day of the week. 73, Alek VK6APK Better save
/archives//html/Amps/2016-12/msg00147.html (12,753 bytes)

343. Re: [Amps] 600W vs 1.5KW amps was: Re: SS amps and autotune... (score: 1)
Author: Alek Petkovic <>
Date: Thu, 08 Dec 2016 12:48:20 +0800
I know very little to nothing about the fineries of solid state amps but I do know, that it's the first half kilowatt, whichever way its derived, that does all the work and makes all the difference o
/archives//html/Amps/2016-12/msg00177.html (10,454 bytes)

344. Re: [Amps] L7 problems (score: 1)
Author: Alek Petkovic <>
Date: Sat, 10 Dec 2016 10:36:56 +0800
Did you check the filament feedthroughs like the other Jim suggested? 73, Alek. VK6APK I had already made the change on the keying going to a 100K 5w and series string of 1N5408 in ct for bias. The r
/archives//html/Amps/2016-12/msg00243.html (14,923 bytes)

345. Re: [Amps] L7 problems (score: 1)
Author: Alek Petkovic <>
Date: Sun, 11 Dec 2016 08:09:59 +0800
If its simple to disconnect all the wires on T1, then a megger will tell you if it is sick. Check between windings and frame, etc. Solid state ones are cheap as chips on ebay and hand wound ones are
/archives//html/Amps/2016-12/msg00255.html (16,166 bytes)

346. Re: [Amps] Line voltage high. (score: 1)
Author: Alek Petkovic <>
Date: Sun, 11 Dec 2016 09:36:48 +0800
At 244V, the filament voltage will still be around 6.8v. You'll still need that resistance. I've done a million 2100 series amps with a ser5ies/parallel combination of low value 5W wirewound resistor
/archives//html/Amps/2016-12/msg00263.html (10,165 bytes)

347. Re: [Amps] L7 FIXED (was L7 problems) (score: 1)
Author: Alek Petkovic <>
Date: Mon, 12 Dec 2016 07:07:59 +0800
The best thing about a forum like this, is reading the happy ending stories and learning just that little bit more about symptoms, troubleshooting and fixes. Thanks for the follow up Paul. 73 from th
/archives//html/Amps/2016-12/msg00283.html (9,926 bytes)

348. Re: [Amps] Drake L4B to 6 Meters Help (score: 1)
Author: Alek Petkovic <>
Date: Tue, 13 Dec 2016 06:05:40 +0800
It could be something to do with your tuning procedure. On 6m with a SB-220 for example, the tuning procedure is a many step process of starting with the load cap, then tune cap, then load, then tune
/archives//html/Amps/2016-12/msg00327.html (12,309 bytes)

349. Re: [Amps] Par Metals (score: 1)
Author: Alek Petkovic <>
Date: Wed, 14 Dec 2016 18:20:09 +0800
Nah but I'm sure that there;'s lots who make Aluminium enclosures. Look it up. Its number 13 on the periodic table of elements. Wish you yanks would learn to spell and pronounce words properly. :-) C
/archives//html/Amps/2016-12/msg00363.html (7,688 bytes)

350. Re: [Amps] Alpha 9500 Idling Current (score: 1)
Author: Alek Petkovic <>
Date: Fri, 30 Dec 2016 07:37:04 +0800
So, what's the deal here? We have heard from several owners now and from the people who make the amps and all the idling currents are wildly different. Are they coming out of the factory like this or
/archives//html/Amps/2016-12/msg00521.html (11,932 bytes)

351. Re: [Amps] VHF all-mode and DC-to-daylight rigs (score: 1)
Author: Alek Petkovic <>
Date: Thu, 05 Jan 2017 11:08:57 +0800
Not much use, here in VK6. All you'll see for most of the time, on most bands, is a flat trace. We're far enough away from everybody else in the world, to be able to enjoy the spectrum to ourselves.
/archives//html/Amps/2017-01/msg00073.html (9,410 bytes)

352. Re: [Amps] Decline of homebrewing? (score: 1)
Author: Alek Petkovic <>
Date: Sun, 08 Jan 2017 16:45:28 +0800
Your pills Steve. You forgot to take your pills mate. :-) 73, Alek VK6APK On 8/01/2017 2:57 PM, Steve Wright wrote: On 08/01/17 04:45, Jim Garland <> wrote: I don't want to be argu
/archives//html/Amps/2017-01/msg00167.html (11,215 bytes)

353. Re: [Amps] Off topic - help with (score: 1)
Author: Alek Petkovic <>
Date: Tue, 28 Feb 2017 15:32:22 +0800
Agreed. Here, downunder, in Australia, we find that we buy heaps of stuff from overseas and it is so sad that most US based people find it so difficult to post something to an overseas destination. I
/archives//html/Amps/2017-02/msg00225.html (11,417 bytes)

354. Re: [Amps] Questions on Alpha 8410 (score: 1)
Author: Alek Petkovic <>
Date: Wed, 01 Mar 2017 09:56:45 +0800
Correct. The overshoot, generates a DC voltage which holds the drive down for the next bit of the rf envelope. The overshoot has already passed out of the radio and through the amp. However, if you h
/archives//html/Amps/2017-02/msg00232.html (10,551 bytes)

355. Re: [Amps] 1/4" Panel bushing and insulated Couplers Needed (score: 1)
Author: Alek Petkovic <>
Date: Wed, 15 Mar 2017 10:04:45 +0800
I get all my 1/4" panel bushings from old potentiometers. I also had an idea, that KM1H sold them. Some of the CNC shaft couplers on Ebay, are insulated but I don't know what sort of voltage or frequ
/archives//html/Amps/2017-03/msg00101.html (8,718 bytes)

356. Re: [Amps] AMERITRON BOARD (score: 1)
Author: Alek Petkovic <>
Date: Sun, 02 Apr 2017 07:28:45 +0800
Indeed. I agree. The existing capacitor bank is maxed out with the 3600V from the power supply with 240V input. In my own amp, I swapped out the caps with 500V ones, a few years ago, to give me at le
/archives//html/Amps/2017-04/msg00005.html (8,407 bytes)

357. Re: [Amps] GS-35B test at low voltage (score: 1)
Author: Alek Petkovic <>
Date: Tue, 25 Apr 2017 12:50:15 +0800
According to the curves, with 1kV on the anode, it only starts conducting when bias is less than 10V or so. At 0V, she'll run at about 200mA. Kill the bias and try it. 73, Alek VK6APK I have a VHF am
/archives//html/Amps/2017-04/msg00255.html (8,454 bytes)

358. Re: [Amps] GS1B / GS31B life span? and DC heater voltages (score: 1)
Author: Alek Petkovic <>
Date: Fri, 05 May 2017 06:35:43 +0800
I think those tubes were strictly made for military use and that those ratings are for inside a tank or war plane. They probably pulled the tubes after that many hours. 73, Alek. VK6APK On 4/05/2017
/archives//html/Amps/2017-05/msg00058.html (9,718 bytes)

359. Re: [Amps] PL172 (8295) (score: 1)
Author: Alek Petkovic <>
Date: Sun, 07 May 2017 07:44:20 +0800
A 1kV megger will give you an immediate indication if there is any leakage. I use it on old tubes. I run them in a burn in jig which applys heater volts and blows air through the tube. Some of the ol
/archives//html/Amps/2017-05/msg00088.html (8,882 bytes)

360. Re: [Amps] new amp race (score: 1)
Author: Alek Petkovic <>
Date: Mon, 22 May 2017 05:55:32 +0800
Agreed. When K0IR and co went to VP8 (South Orkney) they did it ultra lite style, without amps. From VK6 to there, is among the most difficult paths in the world. That one is one of the last two I ne
/archives//html/Amps/2017-05/msg00225.html (11,579 bytes)

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