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21. [Amps] Speaking of Palomar (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Wed Mar 12 11:15:53 2003; I am not fmiliar with this particular model, but if it does not have a switched lowpass filter (in other words, if it doesn't have a bandswitch) then it is certainly generating harmonics to a degree; /archives//html/Amps/2003-03/msg00474.html (7,854 bytes)
22. [Amps] Speaking of Palomar (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Thu Mar 13 12:50:33 2003; The 1/2 distinction only applies to tubes. Class AB (for transistors or tubes) means that the conduction angle is more than 180 degrees (180 degrees is class B) and less than 360 degrees (class A). B; /archives//html/Amps/2003-03/msg00531.html (8,086 bytes)
23. [Amps] A question about SB-200/SB-201 (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Thu Mar 13 16:13:13 2003; I suggest that you temporarily short-circuit the choke and (with the amplifier off) look for resonances with a dipmeter, particularly near 17 meters. It's possible that the choke has a series self-re; /archives//html/Amps/2003-03/msg00538.html (7,197 bytes)
24. [Amps] pi-net tanks (score: 184): 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)
25. [Amps] Problems with 3cx3000 amp (score: 184): 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)
26. [Amps] injected SPAM (score: 184): 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)
27. [Amps] Alpha mania (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Mon Feb 3 13:11:48 2003; The feature that's important is automatic tuning. In some contests this is a very big advantage -- both to save time and to prevent damage from errors made in the heat of battle. That means you eithe; /archives//html/Amps/2003-02/msg00040.html (7,468 bytes)
28. [Amps] Heathkit HL-2200 (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Thu Feb 6 13:13:34 2003; I'm not sure about this amplifier, but in 1979 I built an SB201 (the FCCized version of the SB200). It did not come with a 10 meter position marked on the front panel, and the bandswitch had a stop a; /archives//html/Amps/2003-02/msg00108.html (7,869 bytes)
29. [Amps] SB220 Improvements (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Wed Feb 12 11:07:36 2003; Didn't the 30L1 do this as well? Maybe they all copied Collins. As I understand it, the caps are series resonant with the grid lead inductance at some frequency, and -- at least at that frequency --; /archives//html/Amps/2003-02/msg00282.html (7,988 bytes)
30. [Amps] 2sc2879 idle collector current (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Tue Feb 18 16:38:53 2003; When adjusting the bias for a 2sc2879 amp operating at 15v, what should the resting collector current be for reasonably linear operation? I've seen values suggested that range from 100 to 200 ma per; /archives//html/Amps/2003-02/msg00366.html (6,629 bytes)
31. [Amps] FS -- Henry solid state amplifier, $850 (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Sat Feb 22 12:07:21 2003; For sale, Henry Radio solid state amplifier, model SS-750HF. See <http://www.radiodan.com/Henry/sshf_pix.htm> This 3-year old amplifier puts out over 1 KW on 160/80 meters, and about 500 on 10 meters; /archives//html/Amps/2003-02/msg00413.html (7,321 bytes)
32. [Amps] KNOB ORIENTATION (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Tue Feb 25 13:06:06 2003; Everyone knows that slotted screws are at least 11db worse from an IMD standpoint. Vic K2VCO; /archives//html/Amps/2003-02/msg00459.html (8,080 bytes)
33. [Amps] AL-811H problems (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Mon Jan 27 11:32:30 2003; .... A dead tube will certainly change the input impedance to some extent. It's possible also that a piece of the broken filament in your dead tube is touching the grid, which will change the input i; /archives//html/Amps/2003-01/msg00247.html (6,976 bytes)
34. [Amps] Heathkit SB-220/221 HV Transformer (score: 184): 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)
35. [Amps] Cooliing 3-500Z in AL-80 (score: 184): 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)
36. [Amps] Heathkit SB-220/221 HV Transformer (score: 184): 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)
37. [Amps] Difference between Heathkit SB-200 and SB-201? (score: 184): 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)

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