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Did the Russians make a 6L6 equivalent...

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#7
What prompted this was looking at an STC data sheet for the 5B/255M (aka CV391). It stated that this tube (and the 5B/254M, anode top cap) are similar to the 807. The 807, with an anode cap, was the forerunner (kinda sorta), of the 6L6 glass versions.

CV391 are rare and therefore expensive. But if the Ruskies made one, they made decent loctal sockets, it might be another tube we could all play around with.

Just thinkin'.

Steve
 
#8
The 807, with an anode cap, was the forerunner (kinda sorta), of the 6L6 glass versions.
Click to expand...

The 6L6 (metal) and 6L6G (glass) preceded the 807, which was developed for RF use with the plate wired to the top cap and some RF shielding added.

The 6L6GA was the same as the 6L6G with a slightly smaller bottle. The 6L6GB got some reliability improvements.

The 807 with its RF shielding removed and an octal base installed became the 6BG6 which was a TV sweep tube. The 19 watt plate of the 6L6 will just barely fit into a standard octal envelope, so that combination with an odd pinout, like the 6AV5 was sold for TV sweep tube use, they are quite rare.

There are several variants of some of these with different heater voltages, and even a metal 6L6 with a 2.5 volt DH filament.

All of these have the same internal structure with the added RF shielding on the RF variants.

The 6L6GC got a bigger plate with heat radiating fins. The 7027 is similar to the 6L6GC, and the 7027A has even bigger heat radiating fins and can handle the most power.

The 807 was a highly used tube in the years following WWII. Dozens of manufacturers made them, and not all of them followed the same rules. As tube manufacturing was winding down, assembly lines were being closed and only high volume runners were being made. Some tubes simply vanished from production while others were consolidated. It is common to find 6L6GC's, 6BG6GA's and even a few 807's with the bigger 7027A guts inside, often without the RF shielding. Sylvania / Philips did this a lot.
 
#11
The Russians got quite a few 807s during WW2 in the radios built here for their tanks. Many of those radios shewed up as surplus here around 1958-1960, complete with the Cyrillic labeling. One of the guys in the lab bought one, it was cheap.
Same guy also bought a gun camera, it ran on the 28-32V supply of the aircraft. Probably meant for a Spitfire or Mustang. That war was finally over.🙂
 
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