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References: [ +from:4cx250b@miamioh.edu: 327 ]

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81. Re: [Amps] SHV Connectors and B- (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Wed, 12 Mar 2014 17:20:27 -0600; Paul, I don't believe there is any reason to treat a B- return as if it were a B+ lead. With your planned diode clamps, B- will always be within a few volts of chassis ground. Running a separate B- c; /archives//html/Amps/2014-03/msg00062.html (10,261 bytes)
82. Re: [Amps] SHV Connectors and B- (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Thu, 13 Mar 2014 06:06:12 -0600; Hi All, Handling the B- return is straightforward with triode amplifiers, such as Paul's converted Alpha 77D, but it can be a bit tricky with tetrode amplifiers, which typically have cathodes directl; /archives//html/Amps/2014-03/msg00066.html (10,610 bytes)
83. Re: [Amps] SHV Connectors and B- (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Thu, 13 Mar 2014 08:51:57 -0600; Paul and the group, I don't care much for Cinch-Jones connectors for amplfier control, especially the type that cannot be locked into place. They're a very old design and newer, better, safer connect; /archives//html/Amps/2014-03/msg00069.html (14,016 bytes)
84. [Amps] Interesting Power Supply Problem (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Wed, 26 Mar 2014 08:57:15 -0600; Here's an unusual problem I've never encountered before, which I offer in case you ever run into it. I have an external power supply which provides HV and 120VAC to an amplifier RF deck. The power su; /archives//html/Amps/2014-03/msg00161.html (9,780 bytes)
85. [Amps] WTB: Rotron blower motor (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Wed, 26 Mar 2014 11:36:49 -0600; I'm looking for a small Rotron blower motor, labeled 331AS on the brass plate on the motor. It's a 115VAC motor, 0.41A, 3170 rpm, single shaft, takes a 1uF capacitor. The motor is used on several Rot; /archives//html/Amps/2014-03/msg00165.html (6,514 bytes)
86. Re: [Amps] HF2500 Power Supply Caps (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Mon, 7 Apr 2014 07:35:24 -0600; I'm using microwave oven fuses, rated at 5kV and available in various current ratings, up to 900 mA. They can be paralleled for higher currents. They look like elongated 3AG fuses, and fit in 3AG fus; /archives//html/Amps/2014-04/msg00076.html (15,536 bytes)
87. Re: [Amps] [BoatAnchors] Odd Viking KW problem (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Mon, 7 Apr 2014 22:32:39 -0600; Hi All, Here's an update on my Viking KW problem. The problem was that the amplifier tuned normally into a dummy load, but showed a 7:1 VSWR when connected to my SteppIR, which has a nominally 1:1 VS; /archives//html/Amps/2014-04/msg00085.html (8,577 bytes)
88. Re: [Amps] Front Panel Express Help (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Wed, 9 Apr 2014 06:58:43 -0600; There is a utility you can download from the front panel express website for designing dials, arcs, and so forth. Jim W8ZR Sent from my iPhone _______________________________________________ Amps mai; /archives//html/Amps/2014-04/msg00108.html (9,421 bytes)
89. Re: [Amps] WEIRD ONE! (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sun, 20 Apr 2014 10:51:08 -0600; Bill, I'm not familiar with the circuit of the FL2100, but your symptom sounds like there may be an unintended extra shunt that's throwing off your meter readings. Sometimes that's caused by a protec; /archives//html/Amps/2014-04/msg00181.html (9,388 bytes)
90. [Amps] Filament Voltage Question (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Tue, 22 Apr 2014 09:19:04 -0600; I was reading the data sheet this morning on the 4CX3500A and noticed the filament requirements are 5V@90Amps. It occurred to me that I've never understood why so many tubes with indirectly heated ca; /archives//html/Amps/2014-04/msg00186.html (7,408 bytes)
91. Re: [Amps] Filament Voltage Question (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Tue, 22 Apr 2014 10:09:28 -0600; A note from WC6W pointed out that the particular tube in question, a 4CX3500A, actually uses a directly heated cathode, although I'm not sure that makes a lot of difference (except that the filament; /archives//html/Amps/2014-04/msg00189.html (9,617 bytes)
92. Re: [Amps] Filament Voltage Question (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Tue, 22 Apr 2014 13:13:26 -0600; Good point, Bill. I hadn't thought of that, but that's obviously a consideration for VHF/UHF tubes with directly heated cathodes. Jim mechanically fragile. in a high voltage _________________________; /archives//html/Amps/2014-04/msg00195.html (10,957 bytes)
93. Re: [Amps] Auto tune conversion using stepper motors? (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Fri, 25 Apr 2014 05:43:17 -0600; Markku, Stepper motors will work just fine for your application. Yes, one initializes the motors at power on, and then there is no need for additional control feedback. Initializing is easy with air; /archives//html/Amps/2014-04/msg00220.html (8,618 bytes)
94. Re: [Amps] Auto tune conversion using stepper motors? (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sun, 27 Apr 2014 06:48:38 -0600; Markku, your idea might work on glass variables, but you'd probably have to use laser diodes to focus a beam throught the gap. Another (easier) possibility might be to use the same technique SteppIR; /archives//html/Amps/2014-04/msg00233.html (10,362 bytes)
95. Re: [Amps] Auto tune conversion using stepper motors? (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sun, 27 Apr 2014 06:57:29 -0600; Actually, Peter, I think microswitches would be pretty difficult to implement, since vacuum variables are mult-turn devices. I know there were commercial ETO MRI amplifiers that used vacuum variables; /archives//html/Amps/2014-04/msg00234.html (10,393 bytes)
96. Re: [Amps] complicated Bias circuit (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sun, 4 May 2014 20:22:36 -0600; Paul, In standby, the 24V from T2 just biases the tube(s) to cutoff. R20 by itself would almost do this, but without the 24V there would still be some small cathode current in standby which could gen; /archives//html/Amps/2014-05/msg00005.html (9,556 bytes)
97. Re: [Amps] Relay Recommendations (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Fri, 9 May 2014 16:15:53 -0600; Matt, can you be more specific with your question. What coil voltage would you like? AC or DC? How much power do you want to run through the relay? Open frame, coaxial, or vacuum relay? What kind of; /archives//html/Amps/2014-05/msg00046.html (8,418 bytes)
98. [Amps] Rigol DMM (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sat, 10 May 2014 09:35:49 -0600; I'm looking at a Rigol DM3058E bench DMM to replace my beloved Fluke bench DMM (whose vacuum fluorescent display is fading) and wonder if anyone on the list has used one? Specifically, I'd like to kn; /archives//html/Amps/2014-05/msg00060.html (6,781 bytes)
99. Re: [Amps] Rigol DMM (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Mon, 12 May 2014 05:44:36 -0600; Jim, I've got a Rigol DSA815-TG and have never noticed any noise from its power supply. Is that the model you're using? If you've got the same unit, perhaps there a ground or shield connection that i; /archives//html/Amps/2014-05/msg00072.html (9,493 bytes)
100. Re: [Amps] QEX May/June 2014 amplifier article (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sat, 17 May 2014 08:54:55 -0600; I was interested in reading about new high-power RF transistors, but I found that particular article so disorganized and confusing that at the end I had no idea what I had read about. I could make no; /archives//html/Amps/2014-05/msg00099.html (7,731 bytes)

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