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1. [Amps] Difference between Heathkit SB-200 and SB-201? (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sun Aug 17 09:06:26 2003; I had one, and the difference consists in the compliance with the FCC rule to disable the amplifier on 10/11 meters. The SB201 had a modified input circuit and did not have a 10 meter tap on the tank; /archives//html/Amps/2002-09/msg00385.html (7,536 bytes)
2. [Amps] Heathkit SB-220/221 HV Transformer (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sun Aug 3 08:37:29 2003; The SSB duty cycle is less than 50%. Why shouldn't it? Vic K2VCO; /archives//html/Amps/2002-09/msg00304.html (7,996 bytes)
3. [Amps] Heathkit SB-220/221 HV Transformer (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Fri Aug 1 12:32:42 2003; Does it seem reasonable to you that a transformer that was designed to power a 1 KW input (ICAS) amplifier would be adequate atthree times that? Really? Vic K2VCO; /archives//html/Amps/2002-09/msg00289.html (7,881 bytes)
4. [Amps] Cooliing 3-500Z in AL-80 (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Fri Aug 1 12:32:42 2003; Blowing across the tube. This actually works quite well. Vic K2VCO; /archives//html/Amps/2002-09/msg00290.html (6,754 bytes)
5. [Amps] QSk with SB-200 (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Tue Jul 22 08:17:34 2003; Look at http://www.somis.org/QSK922.html http://www.somis.org/HSSw.GIF I've used this circuit successfully with several amplifiers, homebrew and commercial. Rich measures sells a kit of parts and you; /archives//html/Amps/2003-07/msg00117.html (7,006 bytes)
6. [Amps] re Reduction of 50hz hum via metal plate (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sat Jun 28 08:31:45 2003; Perhaps it stiffens the chassis, reducing the soundboard effect. Or increases the mass of that part of the chassis, causing a change in its resonant frequency. Since aluminium was specified, maybe th; /archives//html/Amps/2003-06/msg00231.html (7,362 bytes)
7. [Amps] electronic switching (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Wed Jun 25 09:24:47 2003; I maintain that there would be a much greater degree of QSK usage if it were implemented properly in the transceiver. Since it's usually a tradeoff between QSK and comfort, it's only used when absolu; /archives//html/Amps/2003-06/msg00207.html (8,617 bytes)
8. [Amps] electronic switching (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sun Jun 22 09:30:18 2003; If you have a rig with decent QSK it can be great. Unfortunately, almost all modern transceivers have terrible QSK. The TS850s, for example, sounds wonderful when testing into a dummy load, but when; /archives//html/Amps/2003-06/msg00178.html (9,100 bytes)
9. [Amps] 4 x 807 amp (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sun Jun 15 09:20:58 2003; Except that the suppressor grid on the 1625's is tied directly to the cathode internally (inside the tube base). This means that if you try to use an unmodified 1625 in a GG triode connection, you ha; /archives//html/Amps/2003-06/msg00096.html (7,100 bytes)
10. [Amps] Coax jumper (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Fri Jun 13 08:31:51 2003; The limitation in this case is current, not voltage breakdown, so the duty cycle is relevant. I believe the 600 watt limit refers to 100 percent duty cycle, so assuming a CW duty cycle of 50 percent; /archives//html/Amps/2003-06/msg00081.html (7,640 bytes)
11. [Amps] Coax jumper (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Thu Jun 12 07:46:20 2003; RG58 will be fine, but make sure the connectors are installed properly (this goes for any type of coax, of course). As a matter of course I always recommend shielding control circuits and using shiel; /archives//html/Amps/2003-06/msg00074.html (7,191 bytes)
12. [Amps] Spectrial purity and tank configuration (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sat May 24 09:58:20 2003; It would depend on the configuration of the tuner. An L-network with a series inductor or a pi-network tuner will provide some suppression of harmonics. A T-network, like the majority of commercial t; /archives//html/Amps/2003-05/msg00179.html (7,273 bytes)
13. [Amps] FS: Astron 13v 70a power supplies (240v input) (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Thu May 22 09:50:13 2003; I have for sale two Astron RS70 power supplies, 13.8v (adjustable +/- a volt or two) at 50a continuous/70a peak. They can be connected in parallel for 140a (they have sense inputs to make this possib; /archives//html/Amps/2003-05/msg00170.html (6,761 bytes)
14. [Amps] G-G Amplifiers With No Tuned Input. (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Wed May 7 08:21:32 2003; I think the simplest way to express this is just to say that the 'low pass' type of network has a low Q compared to the 'resonant' network. Vic K2VCO; /archives//html/Amps/2003-05/msg00050.html (8,917 bytes)
15. [Amps] SGC SG-500 low output 21 mhz (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sun Apr 20 08:31:22 2003; I can't give you a definitive answer about the sgc, but I can tell you that my experience with the Henry SS750HF (8 x 2sc2879) is that the output is very dependent on the impedance seen by the amplif; /archives//html/Amps/2003-04/msg00196.html (7,240 bytes)
16. [Amps] Re: Amps Digest, Vol 4, Issue 5 (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sat Apr 5 12:34:17 2003; Moisture, if you stored it in a garage or similar place. I have had this problem with old, unpotted transformers. 73 Vic K2VCO; /archives//html/Amps/2003-04/msg00044.html (6,704 bytes)
17. [Amps] 572B tubes replacements for 811A's (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sat Apr 5 12:31:37 2003; It's that simple, but (in my opinion) pointless. The 572 will not produce any more output than the 811A unless you increase the plate voltage, which will have consequences for other amplifier compone; /archives//html/Amps/2003-04/msg00042.html (7,079 bytes)
18. [Amps] injected SPAM (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sun Mar 30 13:43:07 2003; I agree. This kind of stuff is very hard to find at reasonable cost when you need it and I would hate to see the postings go away. They are not, in my opinion, too frequent and they are obviously not; /archives//html/Amps/2003-03/msg00943.html (7,166 bytes)
19. [Amps] Problems with 3cx3000 amp (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Fri Mar 21 15:39:16 2003; Seems like a lot of turns if you're not using the amp on 160. Temporarily short the choke and check it for resonances with a dip meter. make sure it doesn't have a self-resonance near 40 meters. Vic; /archives//html/Amps/2003-03/msg00761.html (6,980 bytes)
20. [Amps] pi-net tanks (score: 173): Author: vic at rakefet.com (Vic Rosenthal); Date: Sat Mar 15 11:41:47 2003; Even if he used a tuner and the amp saw a 50 ohm resistive load, it's possible that he didn't have it loaded heavily enough (he just misadjusted the loading capacitor). Maybe he used the amp at full; /archives//html/Amps/2003-03/msg00583.html (7,936 bytes)

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