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Total 108 documents matching your query.

1. Re: [Amps] GS-35B Efficiency Varies with frequency? (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Wed, 26 Dec 2012 11:04:19 -0800
My GS-35B (sample of one) is 68Ohms - Paul _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-12/msg00181.html (8,885 bytes)

2. Re: [Amps] 813 efficiency (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Thu, 21 Feb 2013 17:21:32 -0800
I run a pair of 813's grid driven (grounded cathode). Plate voltage is about 2200V. I can get around 700W PEP on 15M and a little less on 10M. Because of the high output cap you need and L-PI. They r
/archives//html/Amps/2013-02/msg00180.html (8,704 bytes)

3. Re: [Amps] 813 efficiency (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Thu, 28 Feb 2013 09:38:30 -0800
Checkout the Expert 2K. Full legal limit even on 6M. A piece of beauty to behold. http://www.expertampsusa.com/ExpertAmps2K.pdf - Paul KW7Y Check the specs for the Icom IC-PW1: 1 kW 100% duty cycle o
/archives//html/Amps/2013-03/msg00002.html (8,551 bytes)

4. Re: [Amps] 813 efficiency (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Fri, 01 Mar 2013 14:56:56 -0800
Sorry, my brain automatically filters out anything that requires typing. Given that, you may wonder how I'm replying here..... - Paul REPLY: If I'm reading the specs right, it's not full legal limit
/archives//html/Amps/2013-03/msg00026.html (8,794 bytes)

5. Re: [Amps] Measuring tank coil inductance (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Tue, 23 Apr 2013 10:30:04 -0700
MFJ 259B antenna analyzer: measured inductance increased rapidly with frequency. Totally worthless. It's actually not bad if you choose a freq where the reactance is less than about 100 Ohms. So for
/archives//html/Amps/2013-04/msg00190.html (7,341 bytes)

6. Re: [Amps] Alpha 87A in Remote Station Service (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Wed, 08 May 2013 21:39:08 -0700
You might consider the ACOM 2000A. I have been using one remotely for many years without a problem. This amp does have a temperature sensor on each tube as well as many other parameters that are avai
/archives//html/Amps/2013-05/msg00128.html (8,849 bytes)

7. [Amps] Different 3-500Z amplifiers (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Mon, 27 May 2013 19:05:05 -0700
I have 2 amps with 3-500Zs. The 3-500Z's have Eimac labeling. The anode of these has vertical fins. I just acquired another amp with 3-500Zs. These tubes have no lebeling and have an anode with a hor
/archives//html/Amps/2013-05/msg00185.html (8,404 bytes)

8. Re: [Amps] Different 3-500Z amplifiers (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Tue, 28 May 2013 10:55:02 -0700
Graphite anodes were/are produced by Eimac, Amperex, Philps, and China. These particular tubes have NO labeling. Does that suggest China? - Paul _______________________________________________ Amps
/archives//html/Amps/2013-05/msg00194.html (9,266 bytes)

9. [Amps] SB200 on 6M (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Sun, 02 Jun 2013 16:16:36 -0700
I'm converting a SB200 for 6M. What's the best configuration for the Anti-Parasitic Choke? Thanks - Paul \ _______________________________________________ Amps mailing list Amps@contesting.com http:/
/archives//html/Amps/2013-06/msg00006.html (7,018 bytes)

10. Re: [Amps] SB200 on 6M (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Mon, 03 Jun 2013 08:12:31 -0700
Dave - I thought it was clear too, an SB200 (with 572Bs). The conversion is mostly done with an easy 600W out on 6M. It's single band. However, I'm still trying to find the optimum anti-parasitic cho
/archives//html/Amps/2013-06/msg00020.html (11,533 bytes)

11. [Amps] SB200 Anti Parasitic Chokes (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Sat, 15 Jun 2013 12:47:56 -0700
A few weeks ago I posted asking if anyone new the optimum Anti-parasitic chokes (APCs) to use when modifying an SB200 for 6 Meters. I received some interesting comments but no definitive answer. So I
/archives//html/Amps/2013-06/msg00225.html (8,382 bytes)

12. Re: [Amps] Help constructing filament choke for pair of 3-500Zs on 6 m (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Fri, 28 Jun 2013 15:23:58 -0700
The standard ferrite rod that you use for 10-80M works fine. I've moded quite a few amps for 6 M and I remove half the turns from the original choke. This reduces the inductance by a factor 4 and wor
/archives//html/Amps/2013-06/msg00268.html (9,292 bytes)

13. Re: [Amps] Help constructing filament choke for pair of (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Mon, 08 Jul 2013 08:38:20 -0700
slightly less than half the original uh..but not a qtr. Inductance is proportional to aprox no of turns squared with a ferrite core. 1/2 squared is 1/4. If you were to keep the length the same (ie d
/archives//html/Amps/2013-07/msg00037.html (7,963 bytes)

14. Re: [Amps] L4B filter caps (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Wed, 24 Jul 2013 15:38:54 -0700
- Paul KW7Y Thanks/73, Gerald K5GW _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ____________________________
/archives//html/Amps/2013-07/msg00066.html (7,034 bytes)

15. Re: [Amps] L4B Caution (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Thu, 25 Jul 2013 10:41:26 -0700
I suggest you remove the bleeder resistors. They serve no purpose other than to speed up the bleed down when you turn the amp off. They create a lot of unnecessary heat in the supply. - Paul KW7Y At
/archives//html/Amps/2013-07/msg00070.html (8,162 bytes)

16. Re: [Amps] L4B Caution (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Thu, 25 Jul 2013 12:24:14 -0700
Yes, I forgot about alc, which I also don't use. - Paul 73 Jim W7RY I suggest you remove the bleeder resistors. They serve no purpose other than to speed up the bleed down when you turn the amp off.
/archives//html/Amps/2013-07/msg00072.html (9,375 bytes)

17. Re: [Amps] L4B Caution (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Thu, 25 Jul 2013 14:05:29 -0700
True, but most people like you modify them for diode bias and auto resistor bias cut off. - Paul Sent from my iPad use ALC (which I don't) then you can remove them. L4B for a pal. The bleeder resisto
/archives//html/Amps/2013-07/msg00074.html (10,554 bytes)

18. Re: [Amps] L4B Caution (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Thu, 25 Jul 2013 16:29:41 -0700
Quite right, I forgot about that. In my amp I removed the ALC and changed the bias to a string of diodes (instead of zero bias) and a 50K (instead of the120V supply) when in standby. - Paul _________
/archives//html/Amps/2013-07/msg00077.html (8,124 bytes)

19. Re: [Amps] Shortwave Returns? [Was: testing the biggest one] (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Sat, 03 Aug 2013 08:57:53 -0700
What airline were you flying? I tried Internet with Southwest Airlines from Seattle to Salt Lake City and it was very intermittent not to mention slow. In addition Southwest do not allow you to use V
/archives//html/Amps/2013-08/msg00022.html (10,506 bytes)

20. [Amps] 160M PI network Toroidal Coil (score: 1)
Author: Paul Baldock <paul@paulbaldock.com>
Date: Fri, 04 Oct 2013 19:47:46 -0700
I'm going to convert a SB221 to a single band 160M amp. It seems most of the amps these days use a toroidal coil for the 160M Output PI network. Does anybody know what cores are typically used for th
/archives//html/Amps/2013-10/msg00028.html (6,609 bytes)


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