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Total 64 documents matching your query.

1. Re: [Amps] questions about hi pot tester (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Thu, 3 Jan 2008 18:02:32 -0700
While we're on the topic of hi-pot testers, does anyone know if the HP ET11122 is a hi-pot tester? I picked one up for free but I have not been able to find a lick of information on it - even talking
/archives//html/Amps/2008-01/msg00051.html (7,863 bytes)

2. [Amps] mfj meters for amp (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Mon, 25 Feb 2008 19:41:51 -0700
I bought a couple cross-needle panel meters from MFJ for an amp project. I was surprised to open the box today and find that they have plastic housings and I can't figure out how they are suppose to
/archives//html/Amps/2008-02/msg00184.html (7,108 bytes)

3. [Amps] CW & SSB amp (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Mon, 25 Feb 2008 19:50:26 -0700
I'm planning a 3x813 amp in grounded-grid. Primary use will be for 160-80-40-20 CW (Class C). What must I do if I occasionally wish to run the amp in linear SSB service (Class B or AB)? Am I understa
/archives//html/Amps/2008-02/msg00185.html (7,279 bytes)

4. [Amps] SB220 power supply (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sat, 1 Mar 2008 07:16:19 -0700
To avoid having to build a separate power supply box, I am thinking of using an SB-220 transformer. As I see it, it was meant to run a pair of 3-500's at about 2700volts and 700mA. I am thinking of u
/archives//html/Amps/2008-03/msg00015.html (7,739 bytes)

5. [Amps] grid bias supply (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sun, 16 Mar 2008 13:53:55 -0600
I was looking at an amp design from a 1959 issue of GE Ham News. Two 813s grounded-grid linear. What makes this design different from the others I've looked at is the addition of an adjustable grid b
/archives//html/Amps/2008-03/msg00138.html (6,953 bytes)

6. [Amps] Grid Bias Supply followup (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sat, 22 Mar 2008 05:25:53 -0600
As a followup to my question about the grid bias supply on the G.E. Ham News 813 amp (and the B&W LPA-1 is nearly the same design): The bias supplies for these amps use a 120:120 transformer, half-wa
/archives//html/Amps/2008-03/msg00202.html (7,016 bytes)

7. Re: [Amps] Grid Bias Supply followup (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sat, 22 Mar 2008 08:34:11 -0600
I think I see now - I had to redraw it to understand. During receive when the T/R switch/relay is open, the -100vdc appears on the grids in reference to the filament(cathode) which is at DC ground vi
/archives//html/Amps/2008-03/msg00206.html (8,635 bytes)

8. Re: [Amps] SB220 "A" mods (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Fri, 28 Mar 2008 10:35:45 -0600
I've often wondered about the "MODE" switch? It selects the appropriate winding tap on the primary for higher voltage SSB or lower voltage CW. As you switch from one mode to the other, there is a tem
/archives//html/Amps/2008-03/msg00315.html (8,145 bytes)

9. [Amps] open frame relay rating (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sat, 29 Mar 2008 09:54:22 -0600
I have several open-frame relays. If I use one for the T/R relay, what should the contact rating be for a 1500w amp? Is it as simple as 1500w / 50 ohms = SQRT of 30A or 5.5 Amps? Tnx, Steve, KK7UV __
/archives//html/Amps/2008-03/msg00339.html (6,546 bytes)

10. Re: [Amps] open frame relay rating (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sat, 29 Mar 2008 12:31:29 -0600
Thanks Carl and others for the replies. I don't plan to use this amp above 20m actually. One of my relays is very similar to the SB-220 relay - and thinking I'd use the same setup with a third pole f
/archives//html/Amps/2008-03/msg00344.html (9,042 bytes)

11. [Amps] EMI Filtering (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Tue, 1 Apr 2008 05:58:32 -0600
I don't see them used in amp supplies - at least in the various commercial or 'handbook' designs I've come across - but are they considered a good idea or quite needless? Followup - when I rewire my
/archives//html/Amps/2008-04/msg00004.html (7,279 bytes)

12. [Amps] HV step start (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sat, 5 Apr 2008 10:08:54 -0600
Been gathering some parts to get my amp power supply together. Mine is basically an SB-220 transformer set up for 230v and the secondary will run about 2700v at 500-600 mA. I have a few questions reg
/archives//html/Amps/2008-04/msg00091.html (7,636 bytes)

13. [Amps] mounting a vacuum cap (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Tue, 8 Apr 2008 04:41:15 -0600
I am going to use a Jennings vac. cap in my amp project. It is the type with the blue 'bell' housing over the 'rotor' end. My amp cabinet will have a dual front panel - the inner rf compartment panel
/archives//html/Amps/2008-04/msg00112.html (7,042 bytes)

14. [Amps] B minus connection (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Fri, 11 Apr 2008 07:07:39 -0600
I notice in many homebrew amps with a seperate P/S that the Millen HV connector is used for B plus, and the occasional Alden or Amhenol HV connectors. But, what is used to connect B minus from P/S to
/archives//html/Amps/2008-04/msg00166.html (7,445 bytes)

15. [Amps] bandswitch question (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Tue, 15 Apr 2008 17:16:28 -0600
Ebay Item number: 170209709824 Are these decent bandswitches? They are break-before-make, and not progressively-shorting. My tank coil is wound for 160m with taps for 80, 40, and 20. Since I am not r
/archives//html/Amps/2008-04/msg00205.html (6,946 bytes)

16. [Amps] turns counter (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Fri, 25 Apr 2008 12:33:03 -0600
Having been shocked by the price of turns counters, I found some fairly inexpensive Veeder-Root units on ebay but they lack the hardware needed to join them up with a panel-mount shaft (for the tunin
/archives//html/Amps/2008-04/msg00296.html (7,413 bytes)

17. [Amps] Sheet aluminum (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Thu, 15 May 2008 17:02:43 -0600
I have my homebrew amp project ready for the sheet metal order. I already have a .125" thick aluminum front rack panel. But how heavy should I go on the remaining panels? I will have 2 side panels, a
/archives//html/Amps/2008-05/msg00098.html (7,369 bytes)

18. [Amps] P/S connector (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sun, 26 Oct 2008 16:39:57 -0600
My homebrew amp power supply is coming along nicely. I need to get 5 connections to the amp via a connector (B minus, ground, 120v hot and neutral, relay line for primary contactor). I had been shopp
/archives//html/Amps/2008-10/msg00121.html (6,898 bytes)

19. [Amps] amp p/s metering (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Wed, 17 Dec 2008 17:37:35 -0700
Is it 'better' to meter the high voltage at the bottom of a bleeder string (I have 8 100k resistors in a SB-220-style power supply), or is it 'better' to build a seperate multiplier string between B+
/archives//html/Amps/2008-12/msg00246.html (7,035 bytes)

20. [Amps] which cathode choke? (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sun, 21 Dec 2008 06:19:49 -0700
I have three different bifilar wound ferrite rod chokes. A homebrew choke measuring 127uH A B&W FC-25A measuring 44uH. An Ameritron/MFJ #10-15115-1 measuring 19uH. The measurements were taken on one
/archives//html/Amps/2008-12/msg00278.html (7,320 bytes)

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