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61. [Amps] Corian for HV insulators? (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Wed, 21 Mar 2012 11:59:15 -0700
Can anyone think of a reason I shouldn't use (plain white) DuPont Corian for HV insulators? (up to 15KV working) I have some Corian scrap on hand, and need to machine some insulating parts for my new
/archives//html/Amps/2012-03/msg00218.html (7,498 bytes)

62. Re: [Amps] Corian for HV insulators? (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Wed, 21 Mar 2012 12:45:21 -0700
My neighborhood? Where the deer and the antelope play... ;-) I can do the microwave test, though. I don't know if it will give me the answers I need for 60hz dielectric strength, but it will tell me
/archives//html/Amps/2012-03/msg00220.html (7,932 bytes)

63. Re: [Amps] Corian for HV insulators? (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Thu, 22 Mar 2012 11:48:35 -0700
If it's the plain white or buff variety it should hold up well. I design and machine a few lithophanes here and there and most of the smaller ones are attached to a Southern window so that the image
/archives//html/Amps/2012-03/msg00234.html (9,733 bytes)

64. Re: [Amps] Corian for HV insulators? (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Thu, 22 Mar 2012 11:55:12 -0700
Those are made from extruded HDPE. (High Density Polyethylene) . It's almost indestructible indoors, but deteriorates with exposure to UV . It does not cut or machine well. The more expensive cast HD
/archives//html/Amps/2012-03/msg00235.html (10,615 bytes)

65. Re: [Amps] Chinese Caps Defective @ RF (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Sat, 24 Mar 2012 00:17:11 -0700
I bought 20 of those on eBay and just hipot tested them TODAY, assuming they're the same thing. They break down around 4000 to 5000 VDC, even with no RF current on them. No warning, no leakage curren
/archives//html/Amps/2012-03/msg00250.html (10,179 bytes)

66. [Amps] New BVT in the family (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Sat, 24 Mar 2012 00:21:51 -0700
Who can resist posting pictures when a new child is born? :-) http://www.n7cxi.com/hipot/bvt_finished.jpg 73, Jim N7CXI _______________________________________________ Amps mailing list Amps@contesti
/archives//html/Amps/2012-03/msg00251.html (6,502 bytes)

67. Re: [Amps] Chinese Caps Defective @ RF (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Sat, 24 Mar 2012 14:39:43 -0700
Has anyone done RF testing on the big doorknobs used in laser power supplies? Many of the 20-40KV caps sold on eBay come from surplus laser gear and were not originally sold for RF use. It would be i
/archives//html/Amps/2012-03/msg00259.html (10,498 bytes)

68. Re: [Amps] How to know when filter caps begin to fail (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Wed, 28 Mar 2012 17:37:58 -0700
Many moons ago my boss at the time was probing about in a live chassis when an aluminum cap blew. His glasses kept the stuff out of his eyes, but when he lifted his head I saw he had a chunk of the a
/archives//html/Amps/2012-03/msg00329.html (9,095 bytes)

69. [Amps] Cheap auxiliary amp cooling (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Fri, 30 Mar 2012 00:29:21 -0700
While playing with my new toy, (QRO HF2500DX) I found that I was able to confirm that it does indeed need auxiliary cooling for high duty cycle modes. Even at relatively low or no power output - just
/archives//html/Amps/2012-03/msg00353.html (7,788 bytes)

70. Re: [Amps] Cheap auxiliary amp cooling (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Fri, 30 Mar 2012 10:13:12 -0700
Thanks, George. In this particular case, I haven't noticed any RF *yet*, but my antennas are some distance from the shack, with common-mode chokes on all the cabling. I'm still slowly digging out aft
/archives//html/Amps/2012-03/msg00363.html (9,514 bytes)

71. Re: [Amps] Cheap auxiliary amp cooling (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Fri, 30 Mar 2012 10:17:17 -0700
Rob, In this particular case, the manufacturer recommends adding a fan for high duty cycle modes. Your point is well taken, though. More pressure would help. Assuming the flange is a standard size, a
/archives//html/Amps/2012-03/msg00364.html (9,525 bytes)

72. Re: [Amps] Cheap auxiliary amp cooling (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Fri, 30 Mar 2012 10:21:59 -0700
Yep, but really no different than my Henry 3KA running 200ma ZSAC @ 4KV with a pair of 3-500Z's. That one isn't good either. The tubes will glow orange after a minute or so just keyed with no drive.
/archives//html/Amps/2012-03/msg00365.html (11,391 bytes)

73. Re: [Amps] Cheap auxiliary amp cooling (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Fri, 30 Mar 2012 13:04:37 -0700
To quote Microsoft, "This [poor] behavior is by design." ;-) WRT the 3KA, if I ever found time I'd like to: . Put in a single 8877 socket . Lift B- off of ground enough to meter . Ground the grid dir
/archives//html/Amps/2012-03/msg00368.html (13,789 bytes)

74. [Amps] Cheap auxiliary amp cooling (clarification) (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Fri, 30 Mar 2012 18:07:24 -0700
I received several offline inquiries as to the QRO HF2500DX's manufacturer's specified ZSAC. It is indeed supposed to be between 400-500ma and the amp performs to spec. 73, Jim N7CXI ... While playin
/archives//html/Amps/2012-03/msg00369.html (8,057 bytes)

75. Re: [Amps] Cheap auxiliary amp cooling (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Sun, 01 Apr 2012 09:59:03 -0700
Roger, The fan IS blowing up and the case temp is actually substantially lower. Pushing the exhaust air back down into the case wouldn't make much sense?? 73, Jim N7CXI ______________________________
/archives//html/Amps/2012-04/msg00003.html (9,534 bytes)

76. Re: [Amps] amp cooling / triodes vs tetrodes (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Mon, 02 Apr 2012 12:59:10 -0700
Leigh, Not to drive everyone up a tree with this topic, but do you know of any non-proprietary designs that might serve at least as a basis for a properly-done EBS implementation? I'm not thinking so
/archives//html/Amps/2012-04/msg00011.html (13,385 bytes)

77. Re: [Amps] amp cooling / triodes vs tetrodes (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Tue, 03 Apr 2012 12:01:40 -0700
Jim, SSB VOX for N7CXI is a definite no-go. ;-) I'll probably eke an EBS circuit out myself just for fun, but I like to study what other people have done first. Call it plagiarism or whatever, but ev
/archives//html/Amps/2012-04/msg00041.html (12,228 bytes)

78. [Amps] YC156 BVT measurements (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Wed, 04 Apr 2012 18:32:22 -0700
I just picked up a "virtually new" YC156 - with 12 minutes runtime. I decided to test it on the BVT against a used/good MRI pull I have the shelf. Since the BVT is new to me I found some interesting
/archives//html/Amps/2012-04/msg00053.html (7,401 bytes)

79. Re: [Amps] YC156 BVT measurements (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Fri, 06 Apr 2012 11:28:57 -0700
It will be interesting to see if a cleaning will change the plate-grid leakage reading on the used tube. If I get time today or over the weekend I'll give a try and report back if anything changes. T
/archives//html/Amps/2012-04/msg00075.html (8,367 bytes)

80. Re: [Amps] Who still sells HV Capacitors (score: 1)
Author: Jim Barber <audioguy@q.com>
Date: Wed, 11 Apr 2012 19:05:25 -0700
16uF 5KV NOS from Henry runs around $120 when they have them. I shudder to think what "brand new" would cost. Carl must drive pretty nice cars. ;-) 73, Jim N7CXI _____________________________________
/archives//html/Amps/2012-04/msg00105.html (9,527 bytes)

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