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In Reply to: RE: Looking for 7189 Russian equavalent posted by Eli Duttman on July 08, 2012 at 08:47:00
I am not sure there is an easy answer to this question but I thought I would ask anyway.
What is the translation/significance or meaning of the EB/ev suffix? I gather from the context it is roughly equivalent to our "A" suffix, meaning "heavy duty". There are a number of designations out there in tube land which don't signify all that much, but in this case it has a very important meaning. I don't know what if any structural differences there are between the basic tube and the EB/EV version? Anybody know?
Steve
Follow Ups:
I hadn't known that the A meant that a specific electrical property/parameter was present. Do you think it has an impact on the sound that tube produces? I have the irrational sense-I suspect from what you said about heater warm up time that it is irrational- that the A designated tubes aren't quite as good sounding as the non A tubes sound. This is certainly not my experience with the W designated tubes I have used e.g 6SN7WGT etc.. It may just be my own thinking, but I am curious if anyone else thinks this way?
Steve
The "A" suffix on U.S. 7 and 9 pin miniature types indicates controlled heater warm up time, for series string service. The character that indicates milspec tough is "W", as in 5Y3 W GTA.
The "EB" suffix on Russian types is also an indication of suitability in military applications. Another Russian suffix indicative of a military rating is "ДР", which transliterates as "dr".
Perhaps Victor Khomenko will expound in detail about Russian suffixes.
Eli D.
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