- 81. Re: [Amps] figuring tube output impedance (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Mon, 27 Feb 2006 18:44:42 -0600
- With 3900 watts you can fry tasty chicken in the dummy load if you use vegetable oil. Think the FCC would fall for that one??? ... I actually had a dummy load filled with vegetable oil. Worked ok but
- /archives//html/Amps/2006-02/msg00648.html (9,500 bytes)
- 82. Re: [Amps] Vegetable oil dummy load (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Tue, 28 Feb 2006 08:20:09 -0600
- The cantenna I was using was a makeshift for testing a 3cpx5000a7 homebrewed amp I had constructed. I used 3 gallons of veggie oil in a plastic storage container. I drown nine, 18" long carborundum r
- /archives//html/Amps/2006-02/msg00662.html (11,289 bytes)
- 83. Re: [Amps] Vegetable oil dummy load (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Tue, 28 Feb 2006 17:10:47 -0600
- According to Vectronics, motor oil does not have a sufficiently high vaporizing temperature and will cause excessive vapor. I found the following quote on eHam: Motor oil is not recommended (at least
- /archives//html/Amps/2006-02/msg00681.html (9,274 bytes)
- 84. Re: [Amps] HB Amps (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Fri, 3 Mar 2006 13:44:44 -0600
- The first amp I built was in about 1980 and used a pair of 6KD6 tubes pulled from TV sets. I also used the transformer out of an old TV set. The pair of 6KD6 tubes would do 200 watts output on 10 thr
- /archives//html/Amps/2006-03/msg00043.html (9,204 bytes)
- 85. [Amps] RE : MW Oven Transformer question (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 22 Mar 2006 06:35:28 -0600
- Not to drift off the subject too much, but I've heard that some hams many years ago would drop there amp's HV transformers in a bucket of oil and run the heck out of them, much over there rated curre
- /archives//html/Amps/2006-03/msg00591.html (14,275 bytes)
- 86. Re: [Amps] RE : MW Oven Transformer question (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 22 Mar 2006 14:11:49 -0600
- Wouldn't the insulation between windings eventually saturate with the oil thus allowing better heat transfer from deep inside? Larry N5BIP What they used to do on oil cooled transformers, is places s
- /archives//html/Amps/2006-03/msg00598.html (9,674 bytes)
- 87. Re: [Amps] "I gotta tell this" (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 29 Mar 2006 10:16:24 -0600
- Will, I, along with many others, have great admiration for you and enjoy the wealth of knowledge you share. Thanks. Can't understand why some people think they are so much better because of the way t
- /archives//html/Amps/2006-03/msg00737.html (13,924 bytes)
- 88. [Amps] NON-CONTACT laser thermometer (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Tue, 11 Apr 2006 06:48:30 -0500
- Don't know if anyone is interested but here is a new laser thermometer with range of -270 to 518 degrees F ( + or - 2 accuracy ) for $40. Here's the link: http://www.harborfreightusa.com/usa/itemdisp
- /archives//html/Amps/2006-04/msg00170.html (6,718 bytes)
- 89. [Amps] NON-CONTACT laser thermometer (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Sat, 15 Apr 2006 10:14:40 -0500
- Thanks to all of you who responded to this subject. Lots of valuable info. Regards, Larry N5BIP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont
- /archives//html/Amps/2006-04/msg00273.html (7,602 bytes)
- 90. [Amps] thp-4 HV transformer (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Sun, 7 May 2006 16:50:54 -0500
- I picked up a very old HV transformer, in good condition, which came from a RF heater which ran a 5868/TB4-1250 tube. The model number on the transformer is THP-4. I have no idea who manufactured it
- /archives//html/Amps/2006-05/msg00033.html (6,827 bytes)
- 91. Re: [Amps] transformer from dielectric heater tspa (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Tue, 9 May 2006 19:31:47 -0500
- Thanks for the info, John. 450 mA of plate current sounds right for the 5868. When I connect the primary of the transformer to 230 VAC I'm getting about 4700 volts AC from ct to outer leg of the seco
- /archives//html/Amps/2006-05/msg00063.html (9,619 bytes)
- 92. Re: [Amps] RE : who needs it? Henry 8K (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 24 May 2006 12:38:28 -0500
- It took many adventurers and some broken rules to achieve the status this nation enjoys today. Without those risk takers, who knows where we'd be. If my neighbor wants to make serious suds, let it be
- /archives//html/Amps/2006-05/msg00334.html (15,285 bytes)
- 93. [Amps] specs on y763 (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Thu, 1 Jun 2006 17:48:47 -0500
- Anyone have a data sheet on the Eimac y763. How similar is it to the 4cx1500B ? Regards, Larry N5BIP _______________________________________________ Amps mailing list Amps@contesting.com http://lists
- /archives//html/Amps/2006-06/msg00016.html (6,118 bytes)
- 94. [Amps] spectrum analyzer module for Tektronix 7603 scope (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Tue, 6 Jun 2006 11:46:48 -0500
- I'm looking for one of one of these ( 7L12, 7L13 or 7L14 spectrum analyzer modules ) that fits the 7603 Tektronix scope I picked up a few weeks back. As usual, I'm hoping I can buy at a good, low pri
- /archives//html/Amps/2006-06/msg00169.html (6,804 bytes)
- 95. [Amps] FW: Johnson 154-3 variable breakdown voltage? (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Sun, 11 Jun 2006 07:54:14 -0500
- You can find variable capacitor specs at this link ( Cardwell Condenser Corp ): http://www.cardwellcondenser.com Regards, Larry N5BIP Don't have a Johnson catalog, need to know breakdown V or plate s
- /archives//html/Amps/2006-06/msg00260.html (7,225 bytes)
- 96. [Amps] FW: glass tape ?scotch 27 (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Thu, 15 Jun 2006 10:33:46 -0500
- Is there a HV spray ( like flyback coating ) that can be applied to toroids that would be acceptable. Larry N5BIP Will asked: with something much cheaper for us poor folks< If you're building a one o
- /archives//html/Amps/2006-06/msg00292.html (8,169 bytes)
- 97. Re: [Amps] Ideal bandswitch brand for 3 kW out am? (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Fri, 30 Jun 2006 10:51:25 -0500
- Concerning the calibrated spark gap: Is this consistent to what I've seen in the Henry Plasma Gens? On the 3cx3000a7 RF gens they incorporated two aluminum half spheres with a small air gap between t
- /archives//html/Amps/2006-06/msg00667.html (10,536 bytes)
- 98. [Amps] FW: Ideal bandswitch brand for 3 kW out am? (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Fri, 30 Jun 2006 13:00:37 -0500
- Mark, The plasma gens I've dealt with were 13.56 MHz. They had a C1 and it was made as you described for c2 for the 27MHz gen. A few years ago I had build a 3cx3000a7 amp but didn't use the spark gap
- /archives//html/Amps/2006-06/msg00670.html (9,876 bytes)
- 99. Re: [Amps] again (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Sun, 2 Jul 2006 13:24:03 -0500
- Mike, I have an on-line calculator for pi & pi-L at this link http://www.pinebeetle.net/amplifier_main.html . These calculations are based on the formulas from ARRL handbook. Regards, Larry N5BIP Mea
- /archives//html/Amps/2006-07/msg00063.html (7,642 bytes)
- 100. Re: [Amps] high frequency filament excitation TSPA (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Sat, 15 Jul 2006 14:57:11 -0500
- I'll probably get some rebuttals from this but here goes. I constructed a 3cpx5000a7 amp a couple years ago. The 15 VAC transformer I used for warming the filament was not center tapped. Although the
- /archives//html/Amps/2006-07/msg00427.html (10,795 bytes)
This search system is powered by
Namazu