Search String: Display: Description: Sort:

Results:

References: [ +from:maflukey@gmail.com: 38 ]

Total 38 documents matching your query.

21. [Amps] FW: 8877 negative grid current (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Sun, 15 Jul 2018 11:41:34 -0500
Hi Conrad, I experienced negative grid current once with an 8877 amp and traced it back to a poor connection at the ground return of the HV supply. You might want to check there first. Hope this help
/archives//html/Amps/2018-07/msg00043.html (8,421 bytes)

22. [Amps] FW: Rookie question: TT Centurion amp (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Fri, 13 Dec 2019 00:52:02 -0600
I believe it's typically 10m for 12m and 15m for 17m. 73 Matt KM5VI I have (4th owner) a Ten Tec Centurion amp. The manual addendum shows the load/tun approx positions for 12, 17, and 30m, but it doe
/archives//html/Amps/2019-12/msg00018.html (7,439 bytes)

23. [Amps] FW: Amp causing RFI (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Wed, 29 Jan 2020 00:14:05 -0600
Hi Gary, The Ten-Tec uses 4 pair of push-pull finals outputting into a set of relay-switched low pass filter networks. You might want to check the 40m low pass filter section. I would do a quick visu
/archives//html/Amps/2020-01/msg00048.html (7,270 bytes)

24. [Amps] Transformer Question (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Thu, 27 Feb 2020 00:49:08 -0600
The HV transformer in my Gonset GSB-201 (original series model) recently shorted out. Peter Dahl offers a replacement, but the cost is not really economical considering the value of the amplifier. I
/archives//html/Amps/2020-02/msg00122.html (7,176 bytes)

25. [Amps] FW: Transformer Question (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Thu, 27 Feb 2020 09:08:40 -0600
Yes - thanks for catching my error Victor. 100uF - not 500uF! Matt KM5VI I suspect those capacitors were actually in series and he added up the values printed on them. 73, Victor, 4X6GP Rehovot, Isra
/archives//html/Amps/2020-02/msg00126.html (7,977 bytes)

26. Re: [Amps] Transformer Question (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Thu, 27 Feb 2020 09:14:52 -0600
... 100uF / 5 = 20 uF. 811H is 120 / 6 = 20uf. So both are the same, the 811H caps just have some additional voltage headroom. Matt KM5VI Yes - thanks for catching my error Victor. 100uF - not 500uF!
/archives//html/Amps/2020-02/msg00127.html (8,510 bytes)

27. [Amps] FW: Transformer Question (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Thu, 27 Feb 2020 09:34:00 -0600
On the Gonset, the line filter choke is on the low voltage DC return side of the diode bridge, I assume to reduce 60Hz ripple. It is undamaged. Are you referring to this choke for removal? The 811H s
/archives//html/Amps/2020-02/msg00128.html (8,782 bytes)

28. [Amps] FW: Transformer Question (score: 1)
Author: <maflukey@gmail.com>
Date: Thu, 27 Feb 2020 13:12:20 -0600
Thanks, you are correct. So 210 / 4 = 52.5 uF for the 811H. Matt KM5VI From: gudguyham@aol.com <gudguyham@aol.com> Sent: Thursday, February 27, 2020 11:10 AM To: maflukey@gmail.com Subject: Re: [Amps
/archives//html/Amps/2020-02/msg00130.html (7,690 bytes)

29. [Amps] FW: Monitor RF output on computer screen (score: 1)
Author: "Matt" <maflukey@gmail.com>
Date: Sat, 7 Mar 2020 12:05:54 -0600
Hi Herb, I believe that the Elecraft W2 wattmeter will interface to a host computer for remote power monitoring. Also, Remote QTH has a WEB server software package tailored for hams that will run on
/archives//html/Amps/2020-03/msg00005.html (8,939 bytes)

30. [Amps] FW: Negative grid drive (score: 1)
Author: <maflukey@gmail.com>
Date: Tue, 4 Aug 2020 00:03:40 -0500
I had an AL-1500 do that one time on me. Turned out to be a poor ground connection at the rectifier board. The board was only grounded via mounting screws to the chassis which had become just loose e
/archives//html/Amps/2020-08/msg00021.html (7,712 bytes)

31. [Amps] FW: High filament current on the 8877 amplifier tube (score: 1)
Author: <maflukey@gmail.com>
Date: Mon, 9 Oct 2023 15:20:45 -0500
I have nothing to offer about the excessive current draw, but I have read a lot of warnings NOT to apply plate voltage to an 8877 until the cathode comes up to full temperature to avoid damaging the
/archives//html/Amps/2023-10/msg00023.html (9,737 bytes)

32. [Amps] FW: FW: High filament current on the 8877 amplifier tube (score: 1)
Author: <maflukey@gmail.com>
Date: Mon, 9 Oct 2023 18:55:19 -0500
Thanks Jim. I'm learning here. Cold cathode = no cathode current = no bombardment I'm guessing? 73 Matt KM5VI Matt, I believe the W8JI precautions you cited are only half correct. Yes, it is importan
/archives//html/Amps/2023-10/msg00025.html (12,218 bytes)

33. [Amps] FW: Fwd: Plate transformer - Rewind (score: 1)
Author: <maflukey@gmail.com>
Date: Fri, 3 Nov 2023 14:25:42 -0500
You might try contacting Hammond Mfg. I seem to recall that they used to offer certain obsolete transformers if you sent them your core. Their Website still says they offer the Peter Dahl transformer
/archives//html/Amps/2023-11/msg00008.html (7,202 bytes)

34. Re: [Amps] AL-82 (score: 1)
Author: <maflukey@gmail.com>
Date: Tue, 9 Dec 2025 00:01:28 -0600
https://www.ctrengineeringinc.com/rf-switches-medium-and-high-power/ Matt KM5VI Does anyone know a source for a bandswitch for the Ameritron AL-82? Is the same switch also used in the AL 1200 and 150
/archives//html/Amps/2025-12/msg00004.html (7,060 bytes)

35. Re: [Amps] AL-1500 'thump' (score: 1)
Author: <maflukey@gmail.com>
Date: Sun, 15 Feb 2026 19:45:37 -0600
Hi Steve, Did you remove the soft start relay and inrush resistor? How old are your PS caps and are they original or upgraded? Matt, KM5VI Hello all, Had a friend using the station this weekend, and
/archives//html/Amps/2026-02/msg00007.html (8,703 bytes)

36. Re: [Amps] AL-1500 'thump' (score: 1)
Author: <maflukey@gmail.com>
Date: Mon, 16 Feb 2026 11:52:54 -0600
For safety's sake, be aware the soft start and safety interlock on some of the AL-1500s were not factory wired per the schematic. Matt KM5VI Hello Matt, I was wrong about the soft start. It IS in the
/archives//html/Amps/2026-02/msg00010.html (10,328 bytes)

37. Re: [Amps] AL-1500 'thump' (score: 1)
Author: <maflukey@gmail.com>
Date: Mon, 16 Feb 2026 22:07:02 -0600
FYI, W8JI sells upgraded HD capacitor boards, upgraded HD rectifier boards, and upgraded soft start boards for the big box Ameritrons on his ebay site. IMO they are very well designed, assembled, tes
/archives//html/Amps/2026-02/msg00012.html (13,760 bytes)

38. Re: [Amps] AL-1500 'thump' (score: 1)
Author: <maflukey@gmail.com>
Date: Tue, 17 Feb 2026 11:00:34 -0600
His ebay store is "W8JI CTR Engineering All Things Ham" https://www.ebay.com/str/w8jictrengineeringallthingsham?_trksid=p4429486.m3561.l161211 Matt KM5VI I wasn't aware of his ebay store. Can you pro
/archives//html/Amps/2026-02/msg00014.html (15,729 bytes)

Current List: 21 - 38
Page: [1] [2]
This search system is powered by Namazu