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#10
December 7th 08, 03:06 AM
posted to rec.radio.amateur.homebrew
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6L6 substitute
philo wrote:
"Stev eH" StevehkhhSDJvhvbjjxbvvbhnvbhzjdnxzvzhzdshbvnjzvnb vnvjbvbcjbvvvvnmxvzjhjzsdg fgsfghgjsghgsljhglhdjfghfufgfhzysgfhczgugfvzlvufzv llgfzlyfyvlgbylvdfghvblyry wrote in message ... JIMMIE wrote: After years of avoiding morse code I am finally getting into it. the ideal of operating a very simple transmitter appeals to my junkbox/ trashcan construction mentality. I am looking for a substitute for a 6L6 that has the plate brought out the top. I was trying to build a little Glowbug transmitter but was having all kinds of problems neutralizing the the thing. I think I would have better luck if I can separate the grid and plate circuits from each other. I am considering an 807 as a replacement Suggestions would be appreciated. Jimmie An 807 IS a 6L6 with a top cap anode connection. Any of the TV line output valves will also do the job if you want cheap, the 6DQ6B works well and has an octal base (The sockets for the 807 are rare). 6146 or 2e26 etc work well but will cost you more. Steve H No way! Back in the old days I've used both 6L6 and 807's and they are not the same tube at all. You could probably use a 6L6 to drive an 807 though IIRC, the usual driver for an 807 was often a 6AG7 but I'd sure a 6L6 would be fine Just for grins I got out the RCA tube handbook and compared the plate curves for the 807 and the 6L6. Up to the limits for the 6L6, they are IDENTICAL. The 807 curves go to higher plate voltage and current. The 807 and the 6L6 have the SAME cathode, grid and plate structures. The differences are in the shielding added to the 807 to reduce grid-plate and grid-cathode capacitance, and in the plate support spacers which are ceramic in the 807 to increase the operating voltage rating of the tube (which is also helped by the plate top connection). You can see the added shielding just above and below the plate supports. The 807 is a MUCH better performer at RF than the 6L6, it usually does NOT require neutralization and would have more power gain than the 6L6. At Audio frequencies the two tubes will perform IDENTICALLY within their maximum ratings. |
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