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Total 18 documents matching your query.

1. [Amps] Collins potentiometer switch (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Tue, 12 Apr 2011 19:54:59 -0700
A friend is looking for one of these switches for his rig. Surplus sales Nebraska has run out of them. A picture and part number can be seen here,however at http://www.surplussales.com/Collins/CollMi
/archives//html/Amps/2011-04/msg00343.html (6,572 bytes)

2. Re: [Amps] Blown anode choke TL922 (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Sun, 24 Apr 2011 14:21:00 -0700
No one has mentioned between turn capacitance. This could be a factor if the wire insulation is not the same material and thickness as the choke you are trying to copy. 73, Dan, N5AR ________________
/archives//html/Amps/2011-04/msg00508.html (11,104 bytes)

3. Re: [Amps] Hi pot test - normal leakage current of vacuum cap (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Sun, 9 Oct 2011 15:45:40 -0700
OM: I have a commercial Hipot tester which can be varied from 0 to 9kv. I tested several vac variables I have and here are the leakage results. 1. 1000pf @ 5kv. 1ua at 5kv, 5ua @ 7.5kv. 2. 1000pf @ 3
/archives//html/Amps/2011-10/msg00025.html (9,011 bytes)

4. Re: [Amps] Different amp recommendations (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Sun, 5 Feb 2012 12:28:47 -0800
John: I would keep in mind a couple of things. 1. Does it use instant warm up tubes like your present amp or do you have to wait 3 minutes to use it ? 2. Are parts, including tubes , easily available
/archives//html/Amps/2012-02/msg00028.html (8,458 bytes)

5. [Amps] Alpha 67PA RFC resonance (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Wed, 28 Mar 2012 12:39:56 -0700
I remember reading about a method of moving the resonance by using a single shorted turn of loosely coupled, HV insulated wire around the choke. The tip was not in any of the usual ham magazines but
/archives//html/Amps/2012-03/msg00313.html (6,749 bytes)

6. [Amps] Antenna tuner loss (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Thu, 3 May 2012 09:32:39 -0700
ARRL tested some popular commercial antenna tuners and reported the results in QST as follows. They covered 160-10 and various loads. All were quite lossy on the low bands with low Z loads. February,
/archives//html/Amps/2012-05/msg00118.html (6,632 bytes)

7. Re: [Amps] Coax for MHV connectors? (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Sat, 23 Jun 2012 16:16:56 -0700
Jim: you need one of the small teflon coaxes like RG142. The same stuff is ideal for making ferrite line chokes for legal limit power. 10 turns on a 2.4 inch OD type 31 core makes a great choke. Reme
/archives//html/Amps/2012-06/msg00385.html (9,915 bytes)

8. Re: [Amps] 8877 Grid Current (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Wed, 19 Sep 2012 16:17:35 -0700
When I acquired my 77DX I also had a similar high grid current reading. W9AC , as I recall, told me that the grid meter circuit is designed to read 2X actual grid current. It was probably on AMPS ref
/archives//html/Amps/2012-09/msg00256.html (8,841 bytes)

9. Re: [Amps] Vacuum relay replacement (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Fri, 26 Oct 2012 07:52:18 -0700
Gary, I had the same problem with my 77DX. Reversing the coil leads cured it . I think the relay core becomes magnetized. It has been working FB for several years since I did that. 73, Dan, N5AR -- D
/archives//html/Amps/2012-10/msg00161.html (10,500 bytes)

10. Re: [Amps] Street Price on a Alpha 77 SX (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Mon, 27 May 2013 20:39:40 -0700
Hi Mike. I have a 77DX which has a hole for an additional tube and a second filament winding on the plate transformer for another tube. I toyed with the idea of adding the second tube but the regulat
/archives//html/Amps/2013-05/msg00187.html (10,795 bytes)

11. Re: [Amps] Amp Supply - Was: Using old amps on WARC query (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Sun, 30 Jun 2013 14:01:18 -0700
I remember seeing information somewhere about 15 years or so ago about using a single shorted turn to move the choke resonance away from a warc band. I think it was an Alpha 76. I am sure the shorted
/archives//html/Amps/2013-06/msg00287.html (7,843 bytes)

12. Re: [Amps] Keying Kenwood TL922 with Yaesu FT1000D (both old guys) (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Fri, 18 Oct 2013 15:38:38 -0700
Jean: I just finished building an interface to key my TL922 from my FT5000. The 922 has 120 volts on the keying line, too much for a small signal transistor. I debated with myself whether to use a hi
/archives//html/Amps/2013-10/msg00329.html (8,396 bytes)

13. [Amps] Alpha 77DX (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Sun, 20 Oct 2013 14:13:55 -0700
After 17 years of reliable service the set of 4 push buttons on the right front refuse to latch when pushed in. Of course the amp will not turn on then. The manual says that there is a solenoid below
/archives//html/Amps/2013-10/msg00361.html (7,354 bytes)

14. [Amps] Alpha 77dx switch (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Mon, 21 Oct 2013 08:18:03 -0700
I just ordered 2 of the 4 pushbutton switch units used in this amp from Mouser. They show 8 units left in stock. Switchcraft 67041K-506. Dan, N5AR _______________________________________________ Amps
/archives//html/Amps/2013-10/msg00379.html (7,035 bytes)

15. [Amps] Alpha 77dx switch (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Tue, 22 Oct 2013 08:58:38 -0700
If you are having trouble locating this switch on Mouser try this: http://www.mouser.com/ProductDetail/Switchcraft/67041K506X/?qs=%2fha2pyFadugyKqJttH5VS%2fn70rk6Ejte%2fY6S9%2fWynzudNBJ%252bgdAL6M2Pp
/archives//html/Amps/2013-10/msg00398.html (7,413 bytes)

16. Re: [Amps] More on Toroidal Tank Circuit Issues (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Fri, 21 Mar 2014 15:02:25 -0700
Jim, I think your 160 toroid when shorted is self resonant with its distributed capacitance on 10m. You might be able to solve this by putting a small cap across the 160 m toroid to move its self res
/archives//html/Amps/2014-03/msg00125.html (10,149 bytes)

17. Re: [Amps] More on Toroidal Tank Circuit Issues (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Fri, 21 Mar 2014 17:47:47 -0700
Jim, I would try a small air wound coil similar to what you would use in a parasitic suppressor in series with the toroid, maybe in the lead to the switch. Dan, N5AR -- Dan Hearn N5AR _______________
/archives//html/Amps/2014-03/msg00127.html (13,141 bytes)

18. Re: [Amps] High Voltage Wire (score: 1)
Author: Dan Hearn <n5ardxcc@gmail.com>
Date: Mon, 19 Jan 2015 14:10:42 -0800
Joe, I have a hi pot tester with an internal Microammeter viewable thru a plastic window in the case.The external + passes thru a hole in the case. A teflon wire allowed about 2-3 microamps at 9kv le
/archives//html/Amps/2015-01/msg00156.html (8,913 bytes)

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