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121. [Amps] 3CX1200D7 on eBay (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Mon, 10 Jul 2006 10:39:42 -0400; There is a 3CX1200D7 for sale on eBay that is finishing in an hour or so. The bidding is up to $138 and the seller acknowledges the fact that there is no continuity between the 2 filament pins. What; /archives//html/Amps/2006-07/msg00306.html (6,947 bytes)
122. [Amps] Tetrode Amplifier (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sat, 15 Jul 2006 11:57:23 -0400; Having just about completed my modifications on the Henry 4K-Ultra, I am looking for another amp project. I have a source for some 4CX300Y tetrodes and I just bought some sockets for them. I am think; /archives//html/Amps/2006-07/msg00422.html (6,794 bytes)
123. Re: [Amps] Tetrode Amplifier (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sat, 15 Jul 2006 13:08:22 -0400; Regarding the 4K-U mods, all I did was eliminate ALL of the input circuitry right up to the blocking cap and replaced it with the LDG auto tuner that they sell for $129. It has no cabinet and require; /archives//html/Amps/2006-07/msg00425.html (9,623 bytes)
124. Re: [Amps] 3-500Z to 3CX1200D7 (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Wed, 26 Jul 2006 17:24:12 -0400; You will need a much bigger filament xfmr, bigger blower. I just replaced my 8877 for 1 3CX1200D7 in my Henry 4K-Ultra. It works fine. If I were you, I would consider just using 1 tube and block off; /archives//html/Amps/2006-07/msg01193.html (7,588 bytes)
125. Re: [Amps] plexiglas isolation in coils (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Fri, 28 Jul 2006 12:41:01 -0400; Mighty Fine Junk that Ameritron. I don't know why you guys buy that s--t. Don't give me that "good amp for the price" speech because it makes Heathkit amp owners mad cuz they have do have a great amp; /archives//html/Amps/2006-07/msg01242.html (10,887 bytes)
126. [Amps] Ameritron Amps (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sat, 29 Jul 2006 00:13:26 -0400; My, I seem to have tweaked a sensitive spot with all you ameritron lovers(not capitalized on purpose). I can see where appliance operators would love them, just buy it, bring it home and plug it in.; /archives//html/Amps/2006-07/msg01272.html (7,135 bytes)
127. Re: [Amps] MTBF - was Ameritron Amps (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Mon, 31 Jul 2006 08:17:16 -0400; MTBF simply means "Mean Time Between Failure", Mean is the arithmetic average. On the average, the unit in question will fail at that point, some less, some more and the variation of when the item wi; /archives//html/Amps/2006-07/msg01427.html (9,237 bytes)
128. [Amps] Svetlana 3CX400A7 Tubes Needed (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Fri, 11 Aug 2006 20:10:47 -0400; I am about to start modifying a MLA2500 and need info on where to buy 2 Svetlana 3CX400A7 triodes. Please contact me off line if you have any info/tubes to sell. Thanks, Bob W6TR ____________________; /archives//html/Amps/2006-08/msg00424.html (6,497 bytes)
129. [Amps] 3CX800A7 Orientation (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Tue, 15 Aug 2006 23:27:13 -0400; Can the 3CX800A7( and the 3CPX800A7) be operated in the horizontal position? Thanks, Bob W6TR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes; /archives//html/Amps/2006-08/msg00516.html (6,160 bytes)
130. [Amps] 3CX800A7 Orientation (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Wed, 16 Aug 2006 16:23:52 -0400; Let me ask again since I only received one rather unsure response to my call for help yesterday. Can the 3CX800A7( and the 3CPX800A7) be operated in the horizontal position? Is it a definite no-no or; /archives//html/Amps/2006-08/msg00518.html (7,079 bytes)
131. [Amps] W6KT (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sat, 19 Aug 2006 21:54:41 -0400; Anyone have an E Mail address for W6KT. I am trying to do his conversion of the MLA-2500 and can't find Figure 7 in the writeups that are on the Internet. Figure 7 is the schematic of the completed c; /archives//html/Amps/2006-08/msg00562.html (6,288 bytes)
132. [Amps] Diode Specs (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Thu, 24 Aug 2006 12:30:11 -0400; Does anyone have the specs for a GE510 diode? I have a bunch of them and as I recall, they are similar to a 1N4006 diode. They are about the same size. I want to use them to replace the 1N5062 diode; /archives//html/Amps/2006-08/msg00640.html (6,292 bytes)
133. Re: [Amps] Diode Specs (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Fri, 25 Aug 2006 13:43:11 -0400; Thanks for the info on the GE510 diodes. I used them in strings back in the 70's and they worked fine. I am now doing some modifications to a MLA-2500 and plan on using them on the diode board. From; /archives//html/Amps/2006-08/msg00658.html (7,881 bytes)
134. [Amps] Heat Paint (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Mon, 28 Aug 2006 12:19:57 -0400; Can someone give me a source for the paint that changes color at high temp, like 250*C for example? Do they make different paint for different temps? Hopefully it comes in very little containers caus; /archives//html/Amps/2006-08/msg00738.html (6,223 bytes)
135. [Amps] Heat Paint (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Mon, 28 Aug 2006 15:06:26 -0400; Thanks to all that gave me advice on where to find the TempilStik. McMaster Carr stocks it and they accept orders of 1 piece. I ended up getting a Tempilstik crayon for 250*C and some paint in a 2oz; /archives//html/Amps/2006-08/msg00741.html (6,534 bytes)
136. [Amps] Cutting G-10 Board (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Tue, 29 Aug 2006 14:23:55 -0400; Does anyone has advice on how to make straight cuts on 1/8" G-10 board material(actually, it is G-11 but very close to being the same as G-10)? I am building a plenum for a MLA-2500 and want straight; /archives//html/Amps/2006-08/msg00777.html (6,888 bytes)
137. Re: [Amps] Pi-L values (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sat, 2 Sep 2006 09:32:22 -0400; According to my Pi-L spreadsheet calculator, the C2/C1 ratio is 4.1 not 2.5. This assumes that you are using K=1.8 in the PLI calculation and a 300 ohm intermediate impedance between L1 and L2. The L; /archives//html/Amps/2006-09/msg00031.html (10,511 bytes)
138. Re: [Amps] Pi-L values (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sat, 2 Sep 2006 09:37:18 -0400; I would also take into consideration the output capacitance of the tube as well as the stray capacitance of the socket, chimney(if metallic) and C1 mounting hardware. I would not use the Pi-L numbers; /archives//html/Amps/2006-09/msg00032.html (9,854 bytes)
139. [Amps] Henry 3K-A Pics (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Sat, 2 Sep 2006 14:15:41 -0400; Anyone have some pics showing the innards of a Henry 3K-A? I am interested in the RF deck above and below and the power supply. Also, what is the voltage on the finals and is it tap selectable? Bob W; /archives//html/Amps/2006-09/msg00043.html (6,254 bytes)
140. [Amps] Henry 3K-A Step Start Resitor Cone (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Tue, 5 Sep 2006 21:43:00 -0400; Does anyone have a source for a step start resistor cone, the one that looks like a light bulb with lots of windings of toaster wire? The one that was in my just acquired 3K-A was open. I need one. B; /archives//html/Amps/2006-09/msg00112.html (6,363 bytes)

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