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121. [AMPS] Simulating center tap (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 16 Nov 1999 09:47:10 -0800; I just noticed that the filament transformer I was planning to use (got it free) for my 2 x 3-500z amp does not have a center tap. It has two 5v 20a windings which I was going to put in parallel. I r; /archives//html/Amps/1999-11/msg00345.html (7,752 bytes)
122. [AMPS] Simulating center tap (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 16 Nov 1999 13:51:13 -0800; But then the "CT" is unbalanced with respect to each tube, since the filaments have to be in series too. How is this different from putting them in parallel and connecting the b- return to one side?; /archives//html/Amps/1999-11/msg00356.html (7,928 bytes)
123. [AMPS] Simulating center tap (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 16 Nov 1999 16:06:00 -0800; Replying to my own message, But, Vic, you dummy, the hum modulation of the one tube is exactly out of phase from that on the other tube! Duh. Sorry, Rich (and others), you guys were right. The series; /archives//html/Amps/1999-11/msg00359.html (8,070 bytes)
124. [AMPS] Little amps (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 26 Nov 1999 09:48:35 -0800; This question is a little different from what we usually see here, but I need a creative solution. I'm building a little Elecraft K2 transceiver kit. It will put out about 10 watts CW and SSB. I woul; /archives//html/Amps/1999-11/msg00503.html (7,394 bytes)
125. [AMPS] The Worldwide, No Holds Barred, SWR Quiz. (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 02 Oct 1999 16:33:44 -0700; Undetermined, depending on the meter's construction and circuitry. This is not an appropriate instrument for this test. 1.86 to 1 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/amp; /archives//html/Amps/1999-10/msg00056.html (8,954 bytes)
126. [AMPS] Re: The Worldwide, No Holds Barred, SWR Quiz. (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 04 Oct 1999 10:39:31 -0700; No. It is correct that the impedance seen by the generator is 50 ohms but the SWR is unchanged, regardless of the line length. The SWR is entirely determined by the impedances of the line and the loa; /archives//html/Amps/1999-10/msg00112.html (10,556 bytes)
127. [AMPS] Re: The Worldwide, No Holds Barred, SWR Quiz. (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 04 Oct 1999 12:32:21 -0700; Correct. Correct. Not correct! A generator would see a 50 ohm load at this point, and would be able to match it as well as in the case of an arbitrary length of 50-ohm coax feeding a 50-ohm load. How; /archives//html/Amps/1999-10/msg00123.html (10,543 bytes)
128. [AMPS] The Worldwide, No Holds Barred, SWR Quiz. (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 04 Oct 1999 12:36:05 -0700; Because an SWR meter computes SWR by comparing forward and reflected power, not by being an impedance bridge! 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submission; /archives//html/Amps/1999-10/msg00124.html (9,088 bytes)
129. [AMPS] Re: The Worldwide, No Holds Barred, SWR Quiz. (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 04 Oct 1999 20:07:09 -0700; Anywhere on the 93-ohm coax. Now, IF you hooked a 50-ohm SWR meter to the end of 1/2 wavelength of 93-ohm coax, THEN you would get 1 to 1 -- because you would in effect be measuring the SWR on the ti; /archives//html/Amps/1999-10/msg00172.html (10,431 bytes)
130. [AMPS] The things you see Homebrew Amplifiers (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 05 Oct 1999 07:17:35 -0700; I once replaced one in a 4-1000A amp owned by an OT. He told me that every few years he had to replace it! The switches were cheap and he got guys like me to do the work. The current-carrying capabil; /archives//html/Amps/1999-10/msg00191.html (8,676 bytes)
131. [AMPS] Safety resistor (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 11 Oct 1999 11:09:17 -0700; In the common circuit used for GG triode amplifiers that separates the B- from ground in order to allow for convenient plate and grid current metering, there is a 'safety resistor' from B- to ground.; /archives//html/Amps/1999-10/msg00377.html (8,048 bytes)
132. [AMPS] Safety resistor (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 11 Oct 1999 13:31:20 -0700; No, Rich, I'm not referring to the glitch resistor. I know that goes in series with the plate supply. I am asking about the one that goes from the negative power supply output to ground. 73, Vic, K2V; /archives//html/Amps/1999-10/msg00380.html (9,118 bytes)
133. [AMPS] K9AU phone (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 23 Oct 1999 21:56:08 -0700; Does anyone have the current phone number for Frank Stelloh, K9AU (the guy that sells used power tubes)? He recently moved, and the number I have is incorrect. 73, Vic, K2VCO Fresno CA -- FAQ on WWW:; /archives//html/Amps/1999-10/msg00604.html (6,530 bytes)
134. [AMPS] Mica caps in input network (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 24 Oct 1999 13:27:37 -0700; I'm putting together the input pi-nets for my 2 x 3-500z amp. The input cap is a trimmer, and the output is fixed. For some of the values of output capacitors, I have 500v dipped silver mica capacito; /archives//html/Amps/1999-10/msg00610.html (7,358 bytes)
135. [AMPS] Shielding meters (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 25 Oct 1999 21:01:15 -0700; I have four 3" meters across the top of the panel of the RF section of my (under construction) amplifier. They are about 3-1/2" away from the tank coil. I have several options: - Build the top of the; /archives//html/Amps/1999-10/msg00633.html (6,976 bytes)
136. [AMPS] Heathkit HA-10 Warrior (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 05 Sep 1999 11:45:44 -0700; A 10 amp relay should be big enough. But I would remove the plug-in base and connect the coax directly to the lugs attached to the contacts to reduce impedance bumps. 73, Vic, K2VCO Fresno CA -- FAQ; /archives//html/Amps/1999-09/msg00025.html (7,188 bytes)
137. [AMPS] Need a right-angle drive (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 07 Sep 1999 07:20:38 -0700; A sudden change in design of my amplifier project requires another right-angle drive -- does anyone have one for sale or trade? 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/ampsf; /archives//html/Amps/1999-09/msg00031.html (6,877 bytes)
138. [AMPS] Have Cake & Eat it too (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 09 Sep 1999 07:19:54 -0700; If you mean that the meter shows extra high power on frequencies for which the SWR is high, this is an inaccurate power reading caused by the meter's being designed to work properly only on a relativ; /archives//html/Amps/1999-09/msg00043.html (8,868 bytes)
139. [AMPS] Have Cake & Eat it too (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 09 Sep 1999 12:38:07 -0700; Perhaps the amp is being overdriven or is mistuned. I still don't understand whether the problem is that the SWR on a given band goes up as the power output goes up, or if the power that the meter sh; /archives//html/Amps/1999-09/msg00052.html (8,783 bytes)
140. [AMPS] Have Cake & Eat it too (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 09 Sep 1999 18:56:25 -0700; Absolutely! With a perfect swr meter one would expect the SWR reading to remain the same as you increase power from 1 watt to 1 megawatt (at least until the coax starts to melt). 73, Vic, K2VCO Fresn; /archives//html/Amps/1999-09/msg00063.html (9,462 bytes)

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