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Total 31 documents matching your query.

1. [AMPS] MLA-2500B Question (score: 1)
Author: philk5pc@tyler.net (Phil Clements)
Date: Thu, 27 Jul 2000 10:13:44 -0500
This is a multi-part message in MIME format. --=_NextPart_000_0093_01BFF7B3.58EE92A0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable I need the values of
/archives//html/Amps/2000-07/msg00180.html (8,101 bytes)

2. [AMPS] MLA-2500B Question (score: 1)
Author: 2@vc.net (measures)
Date: Thu, 27 Jul 2000 09:20:45 -0700
In a discussion with an MLA owner this week, the padder values are apparently wrong. To make a padder that works, parallel , 50pF and100pF, 5kV doorknobs. The Tune-C should not be fully meshed or fu
/archives//html/Amps/2000-07/msg00183.html (6,959 bytes)

3. [AMPS] MLA-2500B Question (score: 1)
Author: 2@vc.net (measures)
Date: Thu, 27 Jul 2000 10:41:44 -0700
Amen. The orig. padder caps were reportedly bypass-type caps. The Alpha 77SX made the same mistake. later, Phil, K5PC - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.c
/archives//html/Amps/2000-07/msg00184.html (9,282 bytes)

4. [Amps] MLA-2500B Question (score: 1)
Author: "Daniel Hileman" <n9wx@hotmail.com>
Date: Mon, 28 Mar 2005 12:33:21 +0000
Hi Everyone, I have an opportunity to buy a Dentron MLA-2500B for a very resasonable price and it still does full output on most bands. over a kilowatt or near a kilowatt on all bands with only 50 wa
/archives//html/Amps/2005-03/msg00626.html (7,141 bytes)

5. Re: [Amps] MLA-2500B Question (score: 1)
Author: Don Nesbitt <nesbittdr@yahoo.com>
Date: Mon, 28 Mar 2005 05:40:37 -0800 (PST)
Hi Daniel - just my 2 cents follow. Each of these amps has it's "warts" - some more serious than others and they have been more than adequately covered both here and on other reflectors. So I won't p
/archives//html/Amps/2005-03/msg00628.html (12,707 bytes)

6. Re: [Amps] MLA-2500B Question (score: 1)
Author: Tomm Aldridge <KD7QAE@ARRL.NET>
Date: Mon, 28 Mar 2005 19:51:16 +0000
This is an interesting thread to me not because of the AL-811 vs MLA-2500 but because I am designing and building an amp. If I understand this correctly, using a TS570 transceiver to drive my amp imp
/archives//html/Amps/2005-03/msg00633.html (15,695 bytes)

7. Re: [Amps] MLA-2500B Question (score: 1)
Author: Tony King - W4ZT <amps@w4zt.com>
Date: Mon, 28 Mar 2005 17:57:16 -0500
I find that interesting also. There appear to be three distinct camps: 1) Use no tuned input and use the radio output circuit (tuner on some solid state rigs) to make the match, 2) Use a tuned input
/archives//html/Amps/2005-03/msg00637.html (16,639 bytes)

8. Re: [Amps] MLA-2500B Question (score: 1)
Author: Tony King - W4ZT <amps@w4zt.com>
Date: Mon, 28 Mar 2005 22:57:31 -0500
I have gotten the same advice / impressions. A tuned input adjacent to the cathode appears to be the only true way to get a good flywheel effect. I suppose, if you didn't care about improving the IMD
/archives//html/Amps/2005-03/msg00654.html (8,852 bytes)

9. Re: [Amps] MLA-2500B Question (score: 1)
Author: "Will Matney" <craxd1@ezwv.com>
Date: Tue, 29 Mar 2005 00:29:11 -0500
Tony, Even the old 10-11 meter sweep tube amps had a tuned input, or at least the better ones of them. They even knew it was better than not having any at all. Most of those used a tuned transformer
/archives//html/Amps/2005-03/msg00656.html (10,441 bytes)

10. Re: [Amps] MLA-2500B Question (score: 1)
Author: Tony King - W4ZT <amps@w4zt.com>
Date: Tue, 29 Mar 2005 02:40:48 -0500
Hi Will. We agree that's what "should" be, but that's why we're having this discussion. The very subject line of this thread and the fact that the MLA-2500B doesn't have tuned input and the AL-811 do
/archives//html/Amps/2005-03/msg00664.html (13,927 bytes)

11. Re: [Amps] MLA-2500B Question (score: 1)
Author: "Will Matney" <craxd1@ezwv.com>
Date: Tue, 29 Mar 2005 03:56:20 -0500
Tony, The very reason they don't have them is cost. They build the amps as cheap as possible to make the most bux. For amateur amps, this means an extra bandswitch and a tuned circuit for each band.
/archives//html/Amps/2005-03/msg00668.html (15,936 bytes)

12. Re: [Amps] MLA-2500B Question (score: 1)
Author: Gary Schafer <garyschafer@comcast.net>
Date: Tue, 29 Mar 2005 11:26:28 -0500
I don't think most 11 meter amp manufacturers are to concerned about inter mod. The tuned circuit is there to transfer maximum power from the 50 ohm radio. 73 Gary K4FMX _____________________________
/archives//html/Amps/2005-03/msg00684.html (11,861 bytes)

13. Re: [Amps] MLA-2500B Question (score: 1)
Author: Tony King - W4ZT <amps@w4zt.com>
Date: Tue, 29 Mar 2005 11:46:59 -0500
Agreed, cost is an issue for the manufacturing world as it is for individuals but this isn't about the cost. Once again, back to Tomm's question: I believe it is not a good idea to depend on a rig's
/archives//html/Amps/2005-03/msg00688.html (18,362 bytes)

14. Re: [Amps] MLA-2500B Question (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Tue, 29 Mar 2005 14:22:04 -0500
There is a problem with using a built-in tuner with a grounded grid amplifier. In a GG amp, the input and output are effectively in series. The input impedance varies with both the amp tuning and the
/archives//html/Amps/2005-03/msg00696.html (9,395 bytes)

15. Re: [Amps] MLA-2500B Question (score: 1)
Author: "Will Matney" <craxd1@ezwv.com>
Date: Tue, 29 Mar 2005 14:42:04 -0500
Gary, Best, Wil ** REPLY SEPARATOR ** _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2005-03/msg00698.html (12,668 bytes)

16. Re: [Amps] MLA-2500B Question (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Tue, 29 Mar 2005 21:13:44 +0100
Folks, Cutting the manufacturers' some slack for penny-pinching (I must be feeling generous tonight!) isn't it merely that the practice (era) of not including tuned input was more likely based on an
/archives//html/Amps/2005-03/msg00699.html (10,543 bytes)

17. Re: [Amps] MLA-2500B Question (score: 1)
Author: Gary Schafer <garyschafer@comcast.net>
Date: Tue, 29 Mar 2005 15:31:47 -0500
What I am getting at is the 11 meter amps needed all the power they could get for drive as there was only a few watts available usually. With a ham amp there is usually plenty of drive available and
/archives//html/Amps/2005-03/msg00701.html (14,986 bytes)

18. Re: [Amps] MLA-2500B Question (score: 1)
Author: "daniel hearn" <dhearn@ix.netcom.com>
Date: Tue, 29 Mar 2005 12:49:48 -0800
Tony, I think your understanding of the tuned input pro's and con's is better than most of the comments posted to date. A look at my 2001 ARRL HB (p 13.19)gives a good explanation of the multiple ben
/archives//html/Amps/2005-03/msg00702.html (10,227 bytes)

19. Re: [Amps] MLA-2500B Question (score: 1)
Author: Bob Nielsen <nielsen@oz.net>
Date: Tue, 29 Mar 2005 13:28:15 -0800
I don't know if it used much anymore, but recall that some of the early linear amp designs used a high-wattage 50 ohm resistor at the input. This meant that much more drive power was required, but it
/archives//html/Amps/2005-03/msg00704.html (7,807 bytes)

20. Re: [Amps] MLA-2500B Question (score: 1)
Author: Roger Parsons <ve3zi@yahoo.com>
Date: Tue, 29 Mar 2005 23:28:49 +0100 (BST)
I will probably be sorry, but I am going to stick my nose into this one: 1. It is certainly true that a Class B grounded grid amplifier will have a varying input impedance over the driving cycle. 2.
/archives//html/Amps/2005-03/msg00706.html (10,971 bytes)


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