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1. [Amps] QSk with SB-200 (score: 184): 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)
2. [Amps] Coax jumper (score: 184): 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)
3. [Amps] Coax jumper (score: 184): 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)
4. [Amps] 4 x 807 amp (score: 184): 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)
5. [Amps] electronic switching (score: 184): 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)
6. [Amps] electronic switching (score: 184): 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)
7. [Amps] re Reduction of 50hz hum via metal plate (score: 184): 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)
8. [Amps] G-G Amplifiers With No Tuned Input. (score: 184): 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)
9. [Amps] FS: Astron 13v 70a power supplies (240v input) (score: 184): 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)
10. [Amps] Spectrial purity and tank configuration (score: 184): 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)
11. [Amps] 572B tubes replacements for 811A's (score: 184): 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)
12. [Amps] Re: Amps Digest, Vol 4, Issue 5 (score: 184): 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)
13. [Amps] SGC SG-500 low output 21 mhz (score: 184): 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)
14. [Amps] Why hasn't solid state replaced tubes? (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Wed Mar 5 11:21:23 2003; As you well know, deliberate interference is deliberate interference, no matter how polite you are, and Riley won't be pleased with you. Vic K2VCO; /archives//html/Amps/2003-03/msg00180.html (9,295 bytes)
15. [Amps] Alpha 86 (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Wed Mar 5 12:09:41 2003; I am about to acquire an Alpha 86 which has some bandswitch damage. Can anyone comment on experiences replacing bandwitch wafers in this amplifier? I've checked with Alpha and parts are available. An; /archives//html/Amps/2003-03/msg00189.html (7,126 bytes)
16. [Amps] Alpha 86 (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Wed Mar 5 15:49:10 2003; Actually, I already have. I've seen the results of the corona-caused breakdown that you refer to there. I repaired an SB-1000 with a burned 160-meter tune padder contact. This contact was connected t; /archives//html/Amps/2003-03/msg00203.html (8,338 bytes)
17. [Amps] Alpha 86 (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Wed Mar 5 18:32:58 2003; It's just a smoothed brass washer about 3/16" in diameter that is slipped over the lead and the terminals of the switch contact before soldering. The point is to reduce the voltage gradient at that p; /archives//html/Amps/2003-03/msg00212.html (8,747 bytes)
18. [Amps] Alpha 86 (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Wed Mar 5 18:35:18 2003; No, it's a CONDUCTIVE washer that spreads the charge out so it will be less likely to ionize air in the vivinity of a sharp point. Vic K2VCO; /archives//html/Amps/2003-03/msg00213.html (8,385 bytes)
19. [Amps] Electronic Relay Use In RF Aplications (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Thu Mar 6 10:29:24 2003; Yes! I used one to switch the primary circuit of a pair of 12v 70-amp regulated DC supplies for my solid-state amplifier. Everything worked fine when I transmitted into a dummy load, but when I used; /archives//html/Amps/2003-03/msg00260.html (6,998 bytes)
20. [Amps] Ameritron AL-80B - Alternative? (score: 184): Author: vic at rakefet.com (Vic Rosenthal); Date: Sun Mar 9 01:19:02 2003; I think the AL80B is a decent amplifier design; I do not believe there is either an inrush or parasitic problem. And it may be the only game in town at this price point for a new amplifier. I suspect; /archives//html/Amps/2003-03/msg00353.html (7,785 bytes)

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