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ORIGINAL MESSAGE: <snip> ------------ REPLY FOLLOWS ------------ When I went to work in the avionics industry, one of the hardest things I had to relearn was "ground", but I think the way the avionics

Sorry Hal, but your reply was totally incomprehensible. You went off about fractals, space blankets, waterbeds and electric bills without answering my question regarding density of "stuff",

Hi Bob, Were you with Drake when the L-7 came out? Thanks, Garry - WR4R Robert B. Bonner wrote:

Yes, the 3K Ultra uses a transmission line transformer to convert the ~70 impedence at the cathode to 50 ohms... No tuned circuitry... It has worked for ~8 years without problems, though the input swr

I was a Drake technician, put myself through college doing it. (Actually Collins, Hallicrafters FPM-300 was their last hurrah, Kenwood, Drake, Icom I hated Icoms in the 70's they were like transistor

It was done because the TR-4/3 went mobile and the filaments ran off the battery.

That's why I build all my antennas out of steel. My 80 meter beam weighs 62,000 pounds. BOB DD

pentalab escribi: Perhaps there were variations due to availability of certain tubes??; I have two schematics and in both figures the use of 6JB6's in parallel (3.6A intended heater current), but with

Less filament V., more filament A., different socket. Uncheap. R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org

Thanks. The 3cx1200D7 has less feedback C that the A7 version. R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org

Does it use g-g config?

with the output in parallel my surprise, heater current ### The Drake TR-4 and older TR-3 all used 3 x 12JB6's... with all the 12.6 v fils in parallel. The drake T4X/C used a pair of 6JB6's [6.3 v

shell then copper cabinet shielding, #### steel...esp

Actually, copper weighs a little more than steel. Copper: 0.295 pounds In^3 Aluminum: 0.098 pounds In^3 Steel: 0.283 pounds In^3 Copper also has the lowest yield strength of all three with steel being

Bill and Jim, In my first response it was mentioned about the fractal relationships of the molecular structure of materials and their exhibitions of varying qualities regarding excitation by energy

wrote: easier it is better ### as I mentioned b4... steel weighs aprx the same as copper... and doesn't conduct heat worth a damn .2 to 1 ratio for steel to copper [all the heat trnasfer tables use

talk Henry he network? #### The 3 k ultra doesn't have a PI net tuned input... it uses broad banded xfmrs back to back, and relays. inspected, have eyeballs, diodes,

Guillermo, Those tubes are rebrands so it's untelling who actually made them. If it was GE years ago, look to see if there is a series of little dots etched into the glass where the tube number is at.

Hello, I want to ask about something that happened this week with the output tubes in a Drake TR-4 I was committed to repair. It has three 6JB6 in parallel to achieve 200..220 watts out at 80, less at

Bonner" <rbonner@...> wrote: ways a bunch Correct, but it takes a much thinner piece of steel to equal the same strength of aluminum so they equal out close to the same. Generally, 20 gage steel is