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Total 22 documents matching your query.

1. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: ko4a3@juno.com (H. J. Kohl); Date: Sat, 26 Apr 1997 13:43:30 EDT; I have a bad (burned) band switch on my Heath Kit SB-1000. I think it is the same part as the Ameritron AL-80A. Actually only the back gang is bad. Any suggestions where I can get a replacement gang; /archives//html/Amps/1997-04/msg00410.html (7,794 bytes)
2. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sat, 26 Apr 1997 14:19:00 EDT; Get the switch from Ameritron...it is a PnP replacement. Then quit underloading the amp; that is the major cause of zapped switches. Load it up to maximum obtainable output with 100W of drive. Then b; /archives//html/Amps/1997-04/msg00412.html (8,177 bytes)
3. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 26 Apr 97 13:25:25 -0800; This was apparently not the case in the zapped bandswitches whose photographs are available on my Web site. http://www.vcnet.com/measures Unless showered with spilt coffee, the AL-80 and the SB-1000; /archives//html/Amps/1997-04/msg00415.html (9,221 bytes)
4. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 26 Apr 97 13:25:32 -0800; What is the measured resistance of the 100 ohm VHF parasitic suppressor resistor, John? Did the bandswitch first arc when the amplifier was mistuned? I would like to measure the voltage withstanding; /archives//html/Amps/1997-04/msg00417.html (8,871 bytes)
5. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sat, 26 Apr 1997 18:15:23 EDT; -- Begin forwarded message -- From: km1h To: measures@vc.net Subject: Re: [AMPS] Band Switch Heath SB-1000 To: <amps@contesting.com> Date: Sat, 26 Apr 1997 16:32:38 PST Message-ID: <19970426.163531.8; /archives//html/Amps/1997-04/msg00420.html (12,021 bytes)
6. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Sat, 26 Apr 1997 18:38:25 -0500; As I stated in another thread, this problem is exacerbated when a Pi-L tank is in use. I would bet the farm that the majority of switch failures in the SB-1000 occurred when the amp was operating on; /archives//html/Amps/1997-04/msg00421.html (10,200 bytes)
7. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sun, 27 Apr 1997 10:45:10 EDT; The last SB-1000 I worked on blew on 160M Phil. I belive that Tom mentioned the "corona" washer that is used on the AL-80A switch was not used by Heath....never did know what that was for....or if it; /archives//html/Amps/1997-04/msg00424.html (9,076 bytes)
8. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sun, 27 Apr 1997 11:14:03 -0400; This is good advice. Parasitics are absolutely NOT the cause of switch arcing. This is quite easy to understand, if you look at the tank layout and understand ohms law. The anode of the tube is shunt; /archives//html/Amps/1997-04/msg00426.html (11,153 bytes)
9. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 27 Apr 97 10:01:19 -0800; Warning: This is a long reply. Rich unfans are strongly advised to click Delete at this point. ...snip... I did not say that these were the switch specs. This is the measured withstanding voltage for; /archives//html/Amps/1997-04/msg00431.html (12,305 bytes)
10. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Sun, 27 Apr 1997 12:27:02 -0500; I built one of the last SB-1000 kits. It DID specify the installation of the washer on the switch contact. It sticks in my mind so well because I had never seen this done before, and Heath did not ex; /archives//html/Amps/1997-04/msg00432.html (10,650 bytes)
11. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 27 Apr 97 11:27:05 -0800; ...snip... To test Mr. Rauch's theory, measure the resistance of the VHF suppressor resistor after a round of bandswitch arcing. Rich-- R. L. Measures, 805-386-3734, AG6K -- FAQ on WWW: http://www.c; /archives//html/Amps/1997-04/msg00433.html (9,599 bytes)
12. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 27 Apr 97 11:27:08 -0800; ...snip... Carborundum's resistor div. was reportedly purchased by Cesiwid Corp. which is a Swiss-owned. 716 286 7610 Rich-- R. L. Measures, 805-386-3734, AG6K -- FAQ on WWW: http://www.contesting.co; /archives//html/Amps/1997-04/msg00434.html (9,034 bytes)
13. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 27 Apr 97 11:57:07 -0800; (Tom Rauch) (Phil Clements) Oops. I'll bet a large pizza with 4 toppings that this gets ignored, Phil. (Mr. Rauch) "Over ten-times" normal in an SB-1000 would be over 25,000 peak volts. Measuring th; /archives//html/Amps/1997-04/msg00435.html (10,148 bytes)
14. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 27 Apr 1997 19:12:42 +0000; Hi Phil, I appreciate your technical contributions, but I respectfully disagree with some of your comments or observations. The washer reduces the voltage gradient around the terminal for the 160 pad; /archives//html/Amps/1997-04/msg00437.html (13,185 bytes)
15. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Sun, 27 Apr 1997 21:30:13 -0500; No need for the above, Tom. This is why this reflector is so valuable. None of us ever reach a point where we "know it all." We come from two different schools, and sometimes there is more of a commu; /archives//html/Amps/1997-04/msg00439.html (14,279 bytes)
16. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 28 Apr 1997 10:41:52 +0000; Adding cathode degeneration is a requirement, if the exciter is capable of the power levels you mention. ALC will not cure the problem, because ALC is traditionally too slow to limit leading edges o; /archives//html/Amps/1997-04/msg00441.html (15,925 bytes)
17. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 28 Apr 97 10:37:37 -0800; How is this detrimental to the tube? Surely, the 3-500Z will be driven into saturation, however, the tungsten di-carbide emissive layer is atomically-bonded to the tungsten/thorium filament--i.e., i; /archives//html/Amps/1997-04/msg00448.html (13,384 bytes)
18. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: philk5pc@connect.net (Phil Clements); Date: Mon, 28 Apr 1997 12:43:59 -0500; Just a little communications problem here...a fixed, adjustable external ALC supply will cut the exciter back and keep it there. The 1.6 ampre rating @ 1 mhz is the maximum allowable current to maint; /archives//html/Amps/1997-04/msg00449.html (12,609 bytes)
19. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 28 Apr 1997 16:49:45 +0000; The Heath plate padding capacitor is rated at 3.9 amperes at 1 MHz (page 4 of HEC's catalog), that's 936 ohms and the peak voltage is about 5100 volts. All low value HT series caps are voltage limit; /archives//html/Amps/1997-04/msg00451.html (12,549 bytes)
20. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Mon, 28 Apr 1997 17:20:14 EDT; On Mon, 28 Apr 1997 16:49:45 +0000 w8jitom@postoffice.worldnet.att.net writes: WHERE???? But not available new at sane prices if you mean the large BC/Mil style that bolt down. New prices are $60 and; /archives//html/Amps/1997-04/msg00453.html (9,473 bytes)

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