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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)

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