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References: [ +from:pfizenmayer@worldnet.att.net: 21 ]

Total 21 documents matching your query.

1. [Amps] mica padder capacitors. (score: 1)
Author: "HENRY PFIZENMAYER" <pfizenmayer@worldnet.att.net>
Date: Sun, 2 Jan 2005 08:50:13 -0700
I have googled but without much success for a source for the old Sangamo Type H or equivalent mica caps (Thats the one with the molded case that has two mounting holes and the two tabs for connection
/archives//html/Amps/2005-01/msg00013.html (6,506 bytes)

2. [Amps] Cathode (filament potential to ground) (score: 1)
Author: "HENRY PFIZENMAYER" <pfizenmayer@worldnet.att.net>
Date: Sun, 9 Jan 2005 18:08:49 -0700
OK Gurus -- What is the DC voltage from a good 3-500z filament to ground with its grid grounded for DC and 3000 volts on the plate ? I remember the cathode voltage on cathode keyed tube stages approa
/archives//html/Amps/2005-01/msg00162.html (6,912 bytes)

3. Re: [Amps] OT: RF Parts still in business? (score: 1)
Author: "HENRY PFIZENMAYER" <pfizenmayer@worldnet.att.net>
Date: Wed, 2 Mar 2005 08:39:01 -0700
I have placed and received three orders this year with RF Parts and no problem - last one about a month ago -- Rgds-- Hank K7HP _______________________________________________ Amps mailing list Amps
/archives//html/Amps/2005-03/msg00019.html (7,329 bytes)

4. Re: [Amps] Solid State HF High power linear amps- power supply voltage (score: 1)
Author: "HENRY PFIZENMAYER" <pfizenmayer@worldnet.att.net>
Date: Fri, 1 Apr 2005 14:33:43 -0700
On the other end of the spectrum I spent a lot of the end of my" for pay " engineering career working on trying to get efficiency and gain in devices at 1.5 volts --(or 1.2 or 1.3 etc depending on wh
/archives//html/Amps/2005-04/msg00025.html (9,039 bytes)

5. Re: [Amps] Standby tubes (was: Even more power solid-state amp's) (score: 1)
Author: "HENRY PFIZENMAYER" <pfizenmayer@worldnet.att.net>
Date: Sat, 2 Apr 2005 11:23:57 -0700
When I was at Gates Radio , I had the privlege of working with an Engineer , Les Petrey , who worked at the WLW transmitter site when they had the 500KW on the air- I liked to buy him a few beers and
/archives//html/Amps/2005-04/msg00040.html (8,617 bytes)

6. Re: [Amps] WLW/VOA etc high power (score: 1)
Author: "HENRY PFIZENMAYER" <pfizenmayer@worldnet.att.net>
Date: Sat, 2 Apr 2005 20:02:43 -0700
Heck -- does anyone have enough power to wiggle some iron filings around in a glass tube across the ocean ?????? Or generate enough field to arc across a spark gap a few miles away ? Rgds- Hank _____
/archives//html/Amps/2005-04/msg00051.html (8,768 bytes)

7. [Amps] Tentec Centurion - meter calibration (score: 1)
Author: "HENRY PFIZENMAYER" <pfizenmayer@worldnet.att.net>
Date: Sat, 16 Apr 2005 17:48:46 -0700
I have a new Centurion that is back from its first visit to the factory after 11 qso's - had some strange intermittent no pout then blew the bias transistor. Tubes and amp back to TT and they says tu
/archives//html/Amps/2005-04/msg00315.html (7,335 bytes)

8. [Amps] [AMPS] Centurion Fan (score: 1)
Author: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Mon, 4 Jul 2005 07:56:49 -0700
Thanks - Hank K7HP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2005-07/msg00021.html (6,970 bytes)

9. Re: [Amps] [TowerTalk] Are All Low-Pass Filters Alike? - (score: 1)
Author: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Tue, 16 Aug 2005 15:08:02 -0700
FWIW -- In the stop band - normal low pass filters (not of the type that terminate out of band harmonics instead of reflecting them ) will be anything but matched - Further , especially on broad band
/archives//html/Amps/2005-08/msg00555.html (10,552 bytes)

10. Re: [Amps] Power cord to use when converting AL-80B to 240 volts? (score: 1)
Author: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Sun, 2 Oct 2005 15:34:35 -0700
FWIW _ Don't know if its valid for 220 lines to ham transmitters , but the new electric range I just bought says " Effective Jan 1 , 1996 the NEC requires that new construction. (not existing) utiliz
/archives//html/Amps/2005-10/msg00069.html (8,409 bytes)

11. [Amps] TT Centurion _ squeal (score: 1)
Author: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Mon, 3 Oct 2005 21:41:23 -0700
I have run run into something weird on my TT Centurion -- after its been on for about a half hour and then I have it on the air for maybe 5 minutes total of cw - it starts giving an audible squeal ab
/archives//html/Amps/2005-10/msg00105.html (7,388 bytes)

12. Re: [Amps] TT Centuruion oscillation (score: 1)
Author: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Sat, 8 Oct 2005 07:58:06 -0700
By any chance has anyone experienced self oscillation with a Centurion key up after application and removal of drive ? Mine has decided to do this on 40 meters only (into a good 50 ohm dummy load). I
/archives//html/Amps/2005-10/msg00184.html (8,351 bytes)

13. [Amps] Centurion Oscillation and fan squeal (score: 1)
Author: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Mon, 10 Oct 2005 20:16:10 -0700
FWIW _ It appears with the help of several folks on this reflector and the TT reflector the Centurion oscillation problem on 40 meters is resolved. It also appears the "squeal " is fixed but may requ
/archives//html/Amps/2005-10/msg00262.html (8,553 bytes)

14. Re: [Amps] L4 power supply problem? (score: 1)
Author: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Sun, 13 Nov 2005 20:33:32 -0700
Jason - I have an answer for you but it gets rejected by your spam filter - bottom line is that the residual charge after discharge is normal -- Hank K7HP ____________________________________________
/archives//html/Amps/2005-11/msg00173.html (9,399 bytes)

15. [Amps] Centurion (score: 1)
Author: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Fri, 9 Dec 2005 23:27:48 -0700
Centurion Gurus - Started to set the Centurion up on 10 today ( was fine on 80 cw at 2:30 am Sat morning ) - but when I turned it on - before applying RF drive I heard a small pop - but applied the O
/archives//html/Amps/2005-12/msg00110.html (7,566 bytes)

16. Re: [Amps] Centurion (score: 1)
Author: "Henry Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Mon, 12 Dec 2005 20:23:58 -0700
Centurion Guru's Yep blown bias transistor -AGAIN - Now what I want to know is what others experience is with Centurion and blown bias transistors - this is twice in about 3 months for this one. Bad
/archives//html/Amps/2005-12/msg00144.html (7,215 bytes)

17. Re: [Amps] sealed air cooled dummy load in oil?? (score: 1)
Author: "Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Tue, 4 Apr 2006 18:56:29 -0700
You want to be careful of the maximum current and voltage - heat is not the only issue - I remember some "50KW" Bird water cooled loads - and 50 KW was it - If you ran 100 percent amplitude modulatio
/archives//html/Amps/2006-04/msg00083.html (9,531 bytes)

18. [Amps] Freescale LDMOS (score: 1)
Author: "Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Tue, 20 Jun 2006 17:52:44 -0700
Some interesting parts from Freescale - have no idea how many $$$$$$ they are talking about . Wonder how you keep S12 low enough - device plus circuitry to keep a 27 db gain stage stable - 2.4 watts
/archives//html/Amps/2006-06/msg00326.html (6,996 bytes)

19. Re: [Amps] Bouncy Meter (score: 1)
Author: "Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Tue, 5 Dec 2006 09:04:28 -0700
One thing that I found really helped "bouncy" brand new meters on a Centurion amplifier was to put a 3.9 volt zener across the meter terminals . (This obviously only works on a high resistance meter
/archives//html/Amps/2006-12/msg00026.html (7,204 bytes)

20. Re: [Amps] Ceramic capacitor ratings (score: 1)
Author: "Pfizenmayer" <pfizenmayer@worldnet.att.net>
Date: Sun, 15 Apr 2007 09:25:28 -0700
As to the clipping out parts - I went to a co-op school (U of Cincinnati) in the late 50's and my first co-op job was at Crosley Div of AVCO Electronics . I was doing a different job on some antennas
/archives//html/Amps/2007-04/msg00132.html (9,593 bytes)

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