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1. [Amps] Alpha 77 shaft coupling (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Thu Jul 10 07:47:04 2003; Does anyone know if a replacement flexible shaft coupling is available for the Alpha 77? Its the flexible coupling between the turns counter shaft and the tune vacuum variable shaft. 73, Mark WB8JKR; /archives//html/Amps/2003-07/msg00056.html (6,485 bytes)
2. [Amps] Alpha 77 turns counter start point (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Fri Jul 11 09:00:25 2003; Does anyone know what the factory setting is for the tune turns counter? Is it 000 with the cap set at minimum or somewhere else? The manual shows the intial settings to be approximately 100 at 3-5 m; /archives//html/Amps/2003-07/msg00065.html (6,909 bytes)
3. [Amps] Alpha push buttons (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Sat Jul 19 08:08:24 2003; Does anyone know if there are replacements for the white plastic caps on the push buttons on the Alpha 77? 73, Mark WB8JKR ________________________________________________________________ The best th; /archives//html/Amps/2003-07/msg00102.html (6,646 bytes)
4. [Amps] Sb-200 plate current (again) (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Mon Jun 16 08:16:03 2003; Max PLATE current for a 572-B is 275 ma. per tube, maximum grid current is 50 ma. per tube. In a properly operating SB-200 you'll see 500 ma plate current keydown, about 85-100 ma grid current and 20; /archives//html/Amps/2003-06/msg00101.html (10,058 bytes)
5. [Amps] electronic switching (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Fri Jun 20 08:21:20 2003; One problem with PIN's is if the RF voltage the PIN is subjected to in its "off" state exceeds the bias applied to the PIN to turn it off, the RF voltage will attemp to turn the PIN back on. In the l; /archives//html/Amps/2003-06/msg00146.html (15,825 bytes)
6. [Amps] electronic switching (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Sun Jun 22 09:30:31 2003; Horizontal output transistors work well for the HV bias switch. The switch I built used 5 volts at about 700 ma to turn the diodes on and 1000 volts limited to about 2 ma to bias them off and it wor; /archives//html/Amps/2003-06/msg00180.html (9,012 bytes)
7. [Amps] Transformer question (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Fri May 9 08:47:29 2003; Its a "ferro-resonant" transformer. Its designed to be a regulating transformer and under little or no load actually puts out a square wave. The core operates in a saturated mode, these transformers; /archives//html/Amps/2003-05/msg00069.html (11,233 bytes)
8. [Amps] What is it? (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Tue May 13 08:35:54 2003; I know this is off subject, but I thought I'd take a shot. I'm in the process of digging through my tubes etc, and I ran across a tube that looks nearly like a 572B but it has a 5 pin base, made by R; /archives//html/Amps/2003-05/msg00102.html (6,339 bytes)
9. [Amps] Why hasn't solid state replaced tubes? (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Mon Mar 3 15:42:09 2003; Not a whole lot worse than some of the rigs on the market today, unfortunately. Mark WB8JKR On Mon, 03 Mar 2003 15:20:23 -0500 Zyg Skrobanski <af4mp@mindspring.com> writes: __________________________; /archives//html/Amps/2003-03/msg00073.html (8,804 bytes)
10. [Amps] Alpha mania (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Mon Feb 3 11:49:03 2003; I still think that when it comes to amps, a little operator knowledge and the KISS principle in the basic design is the way to go. More fancy features, more fancy headaches. 73, Mark WB8JKR _________; /archives//html/Amps/2003-02/msg00035.html (9,019 bytes)
11. [Amps] Heathkit HL-2200 (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Thu Feb 6 18:04:07 2003; Sloping the feedline from the ant down to the shack also increases signal strength on receive because electrons flow easier downhill. Mark WB8JKR _____________________________________________________; /archives//html/Amps/2003-02/msg00117.html (8,266 bytes)
12. [Amps] Heathkit HL-2200 (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Thu Feb 6 18:22:50 2003; Absolutely! But I think that's why VHF/UHFer's put the antennas on high towers with the feedline straight down, a few DB on receive to benefit the S/N ratio is more important to them. HFer's just cra; /archives//html/Amps/2003-02/msg00120.html (9,009 bytes)
13. [Amps] 10 Meter RF envelope increaser (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Thu Feb 6 20:06:09 2003; Yeah, be it leeener or not leener its still a leeener. ;^) 73, Mark WB8JKR ________________________________________________________________ Sign Up for Juno Platinum Internet Access Today Only $9.95; /archives//html/Amps/2003-02/msg00124.html (8,095 bytes)
14. [Amps] amp rf chokes (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Fri Feb 7 13:09:53 2003; Checking with the choke open indicates where it would work BEST, terminals shorted indicates where it would work worse, actually probably burn up. However as soon as you mount the choke in the compar; /archives//html/Amps/2003-02/msg00153.html (7,998 bytes)
15. [Amps] KNOB ORIENTATION (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Mon Feb 24 18:50:40 2003; Minimum capacitance is associated with maximum loading so I would say fully unmeshed should be 100 73, Mark WB8JKR ________________________________________________________________ Sign Up for Juno Pl; /archives//html/Amps/2003-02/msg00441.html (8,368 bytes)
16. [Amps] Standard Pole Transformers (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Mon Jan 27 20:54:33 2003; I've got a 12KV 10 KVA transformer here, with oil it goes about 250 lbs. I also have a 2400/4600 V 10 KVA unit out of the case and it weighs in at 105 lbs 73, Mark WB8JKR ____________________________; /archives//html/Amps/2003-01/msg00258.html (11,091 bytes)
17. [Amps] K8CPA (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Tue, 24 Dec 2002 15:31:11 -0500; I don't *think* he called anybody a moron, I think he was substituding the word "moron" for "orion" 73, Mark WB8JKR On Tue, 24 Dec 2002 12:01:21 -0800 "Dino Darling" <k6rix@arrl.net> writes: ________; /archives//html/Amps/2002-12/msg00273.html (8,907 bytes)
18. [Amps] RMS-PEP & 2x8877 (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Thu, 7 Nov 2002 13:25:48 -0500; The negative peak occurs 180 degrees away from the positive peak, so they don't occur at the same time. You can't add them together. PEP power is the same power level as you would have KEY DOWN at a; /archives//html/Amps/2002-11/msg00105.html (11,221 bytes)
19. [Amps] Cetron (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Sun, 6 Oct 2002 16:24:09 -0400; Can anyone tell me if Cetron 572-B's are still available, or if Cetron is even still around? Mark WB8JKR ________________________________________________________________ GET INTERNET ACCESS FROM JUNO; /archives//html/Amps/2002-10/msg00048.html (6,341 bytes)
20. [Amps] How light can you make a 500W amplifier? (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Tue, 15 Oct 2002 17:46:35 -0400; The small dual 572B Heath amp was a mobile version of the SB-200. Very very small, it was called the HA-14 and had outboard AC and DC power supplies available. Pretty rare unit in clean condition. 73; /archives//html/Amps/2002-10/msg00158.html (11,100 bytes)

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