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Total 98 documents matching your query.

81. [Amps] OIL CAPS again... (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Fri, 13 Apr 2012 15:39:26 -0700
For some reason the text did not come through on the first message. For those who asked I found the following so far: 2ea. GE Pyranol 4 uF 4KV (larger size) 2ea. GE Pyranol 4 uF 4KV (smaller size) 1e
/archives//html/Amps/2012-04/msg00137.html (6,901 bytes)

82. [Amps] 432 SS amp (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Wed, 15 Aug 2012 11:40:36 -0700
My big 432 amp needs more drive than the exciter can produce. An IPA of 100 watts output or so would fix the problem but I have been unable to find what I need to build one (that I like). In the past
/archives//html/Amps/2012-08/msg00221.html (6,717 bytes)

83. [Amps] Stuff for sale (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Wed, 17 Jul 2013 09:52:04 -0700
Cleaning out the shop. These items are too big/heavy to ship but I hate to salvage them out so will offer them for sale PICK UP ONLY even though I know there is only one person within 100 miles that
/archives//html/Amps/2013-07/msg00049.html (7,202 bytes)

84. [Amps] racks & transformer (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Wed, 17 Jul 2013 11:35:47 -0700
The rack cabinets have been sold. Still have the big transformer: GE transformer: 220/440 primary 12/10/8 secondary 10 kva @ 25% duty cycle currently mounted on castors -- $15 Pick up only. Larry - W
/archives//html/Amps/2013-07/msg00050.html (6,276 bytes)

85. Re: [Amps] Future of RF AMPS (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Tue, 10 Sep 2013 18:18:05 -0700
On 10-Sep-13 5:51 PM, Leigh Turner wrote:using a readily available multiplicity (6 devices in parallel/push-pull) of cheap 50V MOSFETS sourced from the surplus market. Leigh, Exactly which cheap MOSF
/archives//html/Amps/2013-09/msg00020.html (7,701 bytes)

86. [Amps] E-core transformer (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Sun, 01 Dec 2013 07:57:32 -0800
Some time back, some one on this list had a suggestion for dis-assembling the E-core ferrite transformers typically found in switching power supplies. I've had good results using them in low band SSP
/archives//html/Amps/2013-12/msg00005.html (7,377 bytes)

87. Re: [Amps] E-core transformer (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Sun, 01 Dec 2013 16:35:54 -0800
Thanks to all those who have offered suggestion so far both by list and direct. To reply to all suggestions: The "potting" material seems to vary widely from sample to sample. Some have what is defin
/archives//html/Amps/2013-12/msg00009.html (9,006 bytes)

88. Re: [Amps] HV Diodes (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Thu, 16 Oct 2014 14:29:58 -0700
If someone needs Semtech devices for replacement or whatever I have: 4 ea. NOS Semtech Slimpac SCHS 5000 and 12 ea Semtech Slimpac SCFS 2500 (these have full lead length but have solder traces on the
/archives//html/Amps/2014-10/msg00093.html (8,289 bytes)

89. Re: [Amps] What tube? (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Wed, 28 Jan 2015 08:12:48 -0800
AS far as I know, there is only one tube(s) that meet your requirements; a pair of 3-500Zs. If you drop the "instant-on" requirement, there are quite a few other possibilities. One other possibility
/archives//html/Amps/2015-01/msg00342.html (8,854 bytes)

90. [Amps] Odd query.... (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Fri, 24 Jul 2015 12:02:23 -0700
Having run out of "important" projects, I've been toying with starting a "fun" project just for the heck of it. The key words in the project description are: Unusual Unique Weird Wacky and last but c
/archives//html/Amps/2015-07/msg00119.html (7,537 bytes)

91. Re: [Amps] Odd query.... (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Fri, 24 Jul 2015 12:41:17 -0700
Since it's for a low frequency application, my first thought was to just toss it in a bucket of oil. But that wouldn't fit in the volume I need to work with. It would also get messy when I had to mov
/archives//html/Amps/2015-07/msg00122.html (9,265 bytes)

92. Re: [Amps] OK, here's a home brewing question. I JUST DON'T GET IT! (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Fri, 13 Jan 2017 08:09:30 -0800
Ron, I assume from the clips below that you are objecting to the use of a big amp on the new bands. Clearly you have not realized the big picture. Given that a 1/4 wave vertical for the 630 meter ban
/archives//html/Amps/2017-01/msg00259.html (11,164 bytes)

93. Re: [Amps] Amplifier for 630 meter band (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Sat, 11 Nov 2017 09:47:45 -0800
mhz. Apparently it works quite well for AM broadcast purposes. The AS 10 kw coupler works from 1.8 to 60 mhz... and ditto with the AS 3 kw coupler, same deal, 1.8 to 60 mhz. My PowerMaster 3 KW coup
/archives//html/Amps/2017-11/msg00127.html (9,568 bytes)

94. [Amps] YC-156 (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Thu, 9 Aug 2018 06:26:39 -0700
If someone needs a YC-156, I have two known good ones available. One is in an amp that I can demonstrate working. The other is still in the box as I received it from Norm Hockler some time back. I al
/archives//html/Amps/2018-08/msg00025.html (6,483 bytes)

95. [Amps] heat sinks (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Tue, 13 Nov 2018 10:07:36 -0800
Anyone got a good source of aluminum heat sink stock? I know about Heatsink USA. Their prices are steep but not prohibitive. Unfortunately by the time I add on the shipping and handling charges, it n
/archives//html/Amps/2018-11/msg00054.html (6,755 bytes)

96. Re: [Amps] heat sinks (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Sat, 17 Nov 2018 13:50:56 -0800
Manfred, I've played with some "highly efficient" amps. Don't like the complexity. For me at least, simpler is better. I can throw together a simple inefficient AB linear in a heartbeat. Electricity
/archives//html/Amps/2018-11/msg00059.html (9,533 bytes)

97. [Amps] GS35B cathode impedance (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Fri, 19 Jul 2019 14:50:14 -0700
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2019-07/msg00012.html (6,515 bytes)

98. Re: [Amps] GS35B cathode impedance (score: 1)
Author: Larry <larry@w7iuv.com>
Date: Sat, 20 Jul 2019 07:50:58 -0700
Let me try this again: Does anyone have a good number for the cathode impedance of a GS-35B? I've searched the web and found nothing usable. Attempts at determining it empirically have proved less th
/archives//html/Amps/2019-07/msg00016.html (7,201 bytes)

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