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Total 477 documents matching your query.

381. Re: [Amps] Variac knob wanted, with 3/8 hole ! (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sun, 30 Sep 2018 07:56:51 +0800
Same problem here. To get me out of the woods, I had a piece of 1" x 3/8"aluminium bar lying around. I cut it to length and drilled a 3/8" hole through it and then a hole right through the side, to t
/archives//html/Amps/2018-09/msg00043.html (8,693 bytes)

382. Re: [Amps] Super Cathode Driven Tetrodes (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 02 Nov 2018 10:39:48 +0800
Just as an aside, I have just finished refurbishing a Dentron GLA-1000B and I note that it is a Super Cathode design. The Amp Supply LA-1000 and Ameritron AL-84 both use the same 6LQ6 family sweep tu
/archives//html/Amps/2018-11/msg00014.html (13,042 bytes)

383. Re: [Amps] Super Cathode Driven Tetrodes (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 03 Nov 2018 14:34:05 +0800
In my circuit diagram, the control grid of each tube is tied to the cathode. Sent from AOL Mobile Mail Get the new AOL app: mail.mobile.aol.com <http://mail.mobile.aol.com> Just as an aside, I have j
/archives//html/Amps/2018-11/msg00025.html (17,150 bytes)

384. Re: [Amps] Input relay for QSK amp (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Wed, 05 Dec 2018 06:03:37 +0800
G'day Vic. The Matsushita/Panasonic relay that Rich Measures used in his QSK circuit, published at somis.org, is still available on Ebay. I bought 10 of them a couple of years ago Otherwise, Jim, W7R
/archives//html/Amps/2018-12/msg00025.html (9,541 bytes)

385. Re: [Amps] door knob capacitors needed (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 25 Dec 2018 08:06:57 +0800
Despite the lack of published English data on the Russki caps, Dr Alex, UR4LL is pretty good in steering you towards the correct capacitor for your intended application. He is very approachable and a
/archives//html/Amps/2018-12/msg00105.html (9,255 bytes)

386. Re: [Amps] Ham Radio Magazine article six 572Bs on 160 meters (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 11 Jan 2019 06:11:39 +0800
G'day Lane. I have the complete set of Ham Radio Magazine on DVDs. I'll see if I can find the article. 73, Alek. VK6APK On 10/01/2019 7:12 PM, Lane Zeitler via Amps wrote: There was an article in Ham
/archives//html/Amps/2019-01/msg00052.html (8,658 bytes)

387. Re: [Amps] Ham Radio Magazine article six 572Bs on 160 meters (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 12 Jan 2019 08:46:19 +0800
I looked at my discs and I looked at every issue from 1975 to 1986 and there was no mention of the project. I can look earlier and later, if you wish. I also looked at entire 3 Magazine. Same result.
/archives//html/Amps/2019-01/msg00055.html (10,058 bytes)

388. Re: [Amps] Ham Radio Magazine article six 572Bs on 160 meters (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 14 Jan 2019 12:22:50 +0800
Yep. That's where I bought my copy. Excellent value for an excellent resource. 73, Alek. VK6APK There used to be a web site that had the whole run in pdf format. I think someone bought the rights and
/archives//html/Amps/2019-01/msg00061.html (10,239 bytes)

389. Re: [Amps] AL-80B Problem (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 25 Jan 2019 06:15:08 +0800
Intermittent grid to filament short. Change the toob. 73, Alek. The grid lg value goes from 0 to off scale in the negative and the plate Ip value from 0 to +150. When this happens I cant get any outp
/archives//html/Amps/2019-01/msg00117.html (8,704 bytes)

390. Re: [Amps] QRO 2500DX MARK lll 4CX800 (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sun, 31 Mar 2019 06:00:11 +0800
Same thing happened with a Russian GU84B tetrode in the Emtron DX-2SP, at my local radio club. The resistive cathode to grid connection only becomes evident as the valve heats up. Strange. 73, Alek.
/archives//html/Amps/2019-03/msg00063.html (8,606 bytes)

391. Re: [Amps] 3-500Z replacement sockets for TL922 (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 26 Apr 2019 05:56:56 +0800
Yep. In my exp0erience, the Chinese sockets are the ones to go for. See http://www.mableaudio.com/en/productview.asp?sid=3113 They have a very tight grip on the pins, which does not appear to degrade
/archives//html/Amps/2019-04/msg00059.html (9,713 bytes)

392. Re: [Amps] Why 2 3CX800s instead of one 8877? (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 27 Apr 2019 06:36:44 +0800
Ha. That's what ya call "thinkin' outside the anode." Cheers, Alek. VK6APK Dont laugh, it is just a part of hams doing what works when needed. I modified several 8874's decades ago to replace the 887
/archives//html/Amps/2019-04/msg00060.html (11,491 bytes)

393. Re: [Amps] If you posted a message (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 20 May 2019 07:18:56 +0800
If it's not a rude question, why the heck are messages being vetted in the first place? Ive not seen that occur anywhere else and in my opinion, it shows mistrust and I consider it a gross insult to
/archives//html/Amps/2019-05/msg00058.html (8,437 bytes)

394. Re: [Amps] Removing grid shorts (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sun, 02 Jun 2019 15:29:40 +0800
Yeah, my local club has a GU84B with the same condition. No short when she's cold but a couple of minutes into the warmup, the belly ache starts and stays. The tube is a display piece. Cheers, Alek.
/archives//html/Amps/2019-06/msg00006.html (11,471 bytes)

395. Re: [Amps] Fwd: Re: Removing grid shorts (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Wed, 05 Jun 2019 07:47:20 +0800
I had reason to test some unknown 572B valves yesterday. I tested them in an old Yaesu amp. While I was at it, I thought I would try to fix a brand new 572B that has a G-F short. My supplier had alre
/archives//html/Amps/2019-06/msg00017.html (13,456 bytes)

396. Re: [Amps] 3CX800 - a science experiment (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 06 Jun 2019 13:35:27 +0800
Nah. Much simpler would be to come down here to Australia. So, Would running the AMP Up-Side-Down possibly un "SAG" the offending part and the tube work again maybe? You would have to switch side-ban
/archives//html/Amps/2019-06/msg00021.html (8,595 bytes)

397. Re: [Amps] Fwd: Re: Removing grid shorts (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Wed, 12 Jun 2019 08:07:57 +0800
Ok. I see that you want me to think big. I'll do it again and again until there are no more grid wires left. :-) 73, Alek. Carl I had reason to test some unknown 572B valves yesterday. I tested them
/archives//html/Amps/2019-06/msg00034.html (15,491 bytes)

398. Re: [Amps] 4CX1000a test and gettering (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 15 Jun 2019 08:10:58 +0800
Yes. Do it in your own amp. Install the tube and run the heater and fan only, for a day or two. Very simple. Before you do that, if you have a 1kV Megger, you can test the cold tube, between all elem
/archives//html/Amps/2019-06/msg00042.html (8,767 bytes)

399. Re: [Amps] Are Amps Slow on the uptake? Or is it just me? (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sun, 30 Jun 2019 07:55:22 +0800
Good point Jeff. I run the VK6 Inwards QSL Bureau and I get quite a few cards for VK6FO, a call that does not exist. However, 4K6FO, is an active DXer on CW. When I look at the QSO details on the car
/archives//html/Amps/2019-06/msg00085.html (10,224 bytes)

400. Re: [Amps] "Refurbished" BLF188XR's on eBay? (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 13 Sep 2019 07:16:46 +0800
By "refurbished" they mean that they have been sandblasted and then labelled with any label you want to choose. The transistors themselves, are nothing like what is on the label. I bought some, a num
/archives//html/Amps/2019-09/msg00018.html (10,866 bytes)


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