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References: [ +from:dhallam@rapidsys.com: 138 ]

Total 138 documents matching your query.

121. Re: [Amps] How do you measure HV with reasonable accuracy? (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Fri, 07 Aug 2009 07:38:22 -0400
I don't know what you are trying to do and how much accuracy you want, but I picked up an old RCA VTVM with a HV probe for less than $20. Without out going out to the shop to look at it, I think it m
/archives//html/Amps/2009-08/msg00121.html (10,104 bytes)

122. [Amps] 240V Outlet (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 09 Aug 2009 12:00:25 -0400
I need to put in a new 240V outlet at my operating position. Since one of my amp power supplies, a Johnson 2000 has the low voltage portion operating on 120V, I suppose I have to put in a 3 wire plus
/archives//html/Amps/2009-08/msg00146.html (6,987 bytes)

123. Re: [Amps] 240V Outlet (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 09 Aug 2009 12:58:14 -0400
Well, the Johnson 2000 PS is an example of old construction. The neutral is connect to the chassis and the 120V circuits are wired between one hot phase and the chassis so you have to make sure you h
/archives//html/Amps/2009-08/msg00149.html (11,291 bytes)

124. Re: [Amps] 240V Outlet (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 09 Aug 2009 19:43:47 -0400
OK, let me ask a question here. All of my breaker are 15A. Can I replace any of them with 20A breakers. Wiring is 12/2 with ground. David Kc2JD/4 _______________________________________________ Amps
/archives//html/Amps/2009-08/msg00176.html (9,655 bytes)

125. Re: [Amps] 240V Outlet (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 09 Aug 2009 20:30:12 -0400
I have never looked into the problem but reconfiguring the Invader 2000 to lift the neutral off the chassis might be a major effort. It uses two separate power supplies on interconnected chassis. The
/archives//html/Amps/2009-08/msg00183.html (13,189 bytes)

126. Re: [Amps] 240V Outlet and money (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 10 Aug 2009 08:15:31 -0400
What about those of us who are retired and live on a fixed income? Running a 240V line into the ham shack is a major investment. I use BA gear because I like it and like working on it, I bought it ye
/archives//html/Amps/2009-08/msg00217.html (10,409 bytes)

127. Re: [Amps] 240V Outlet (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 10 Aug 2009 08:30:04 -0400
Here is a question about the NEC code. Is it legal to have more than one branch circuit in a single switch box? One time I was installing a new garbage disposal. The switch for the disposal was in a
/archives//html/Amps/2009-08/msg00219.html (9,408 bytes)

128. Re: [Amps] Wire size (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 08 Sep 2009 09:01:17 -0400
PEW means solderable polyester. I am assuming the 0.7 is the wire size in millimeters or 0.0276 in inches which would put it in between 21 and 22 gauge. David KW4DH __________________________________
/archives//html/Amps/2009-09/msg00089.html (7,680 bytes)

129. Re: [Amps] Fixing scratched meters (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 08 Sep 2009 17:48:09 -0400
Take a look at the Novus line of cleaning and polishing compounds for plexiglass. Any marine or plastic supply houses should carry them. David KC4DH _______________________________________________ Am
/archives//html/Amps/2009-09/msg00107.html (7,426 bytes)

130. Re: [Amps] B- questions (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Mon, 09 Nov 2009 11:02:44 -0500
Isn't it also true that in a grid driven amplifier, the cathode is connected to ground and the only B- connection to ground is through the plate current meter. This is done so the plate current meter
/archives//html/Amps/2009-11/msg00140.html (9,548 bytes)

131. [Amps] Sweep Tube Amp (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Thu, 26 Nov 2009 08:55:47 -0500
I recently acquired a sweep tube amp and I got it for nostalgic reasons. This is my first experience with one of these beasts. It is the Side Band Engineers matching amp for an SBE-33 which was first
/archives//html/Amps/2009-11/msg00273.html (7,633 bytes)

132. Re: [Amps] [ham_amplifiers] Sweep Tube Amp (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Thu, 26 Nov 2009 11:50:53 -0500
I am driving it with a SBE-33 which is the companion transceiver that this amp was designed for. It solid state except for the driver and finals, a pair PL-500's. It will put out close to specified o
/archives//html/Amps/2009-11/msg00274.html (17,602 bytes)

133. [Amps] Dummy Loads & Wattmeters (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 02 Dec 2009 12:15:31 -0500
A little education, please. I am working on restoring an old transceiver and linear. I have a Bird 43 wattmeter and a Heath Cantenna dummy load. The wattmeter is for 50 ohm impedance and I measure th
/archives//html/Amps/2009-12/msg00035.html (7,745 bytes)

134. Re: [Amps] Dummy Loads & Wattmeters (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Wed, 02 Dec 2009 12:43:35 -0500
I have measured the Cantenna with 4 different ohmmeters, HP-410B, HP-410C, a DVM, and VIZ multimeter. They all read the same, +/- 1 ohm. Who knows what the Cantenna has been subjected to. I bought it
/archives//html/Amps/2009-12/msg00038.html (9,317 bytes)

135. Re: [Amps] Dummy Loads & Wattmeters (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Thu, 03 Dec 2009 08:39:58 -0500
My original posting has garnered a lot of interesting discussion. To reduce everything to the simplest what I am trying to determine is; If I measure the output of an amp into a dummy load with a mea
/archives//html/Amps/2009-12/msg00071.html (9,799 bytes)

136. [Amps] Isolation Transformer (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Sun, 13 Dec 2009 18:42:42 -0500
I recently picked up a medical grade 3KVA toroidal isolation transformer. It has dual primaries and secondaries so in addition to being a isolation transformer it can be used as a step up/down transf
/archives//html/Amps/2009-12/msg00312.html (7,234 bytes)

137. Re: [Amps] looking for an amp design that can run on 120volts (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Tue, 29 Dec 2009 07:09:00 -0500
Get a hold of Bill Orr's Radio Handbooks from the 1970's. They always carried a number of different amp designs. There were several that used a pair of passive grid driven 4CX300's. Easy to build and
/archives//html/Amps/2009-12/msg00555.html (8,646 bytes)

138. Re: [Amps] step start /triacs/Line Side Regulator (score: 1)
Author: "David C. Hallam" <dhallam@rapidsys.com>
Date: Fri, 12 Feb 2010 06:55:09 -0500
In the October 1987 QST there was a construction article for line side proportional control regulator for a high voltage power supply. Its purpose is to prevent the HV from soaring under idling condi
/archives//html/Amps/2010-02/msg00334.html (9,441 bytes)

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