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In Reply to: RE: are these tesla KT88 any good ? any Tesla expert here ? posted by lovetube on May 16, 2015 at 06:19:47
Well, from what I've heard, I think Tesla had a couple KT88s - a good and a bad one. And then you have JJ... So, if I recall this correctly, this is how it all transpired.
Tesla, up until the fall of Communist Russia, was doing well for itself. Generally, products were great and built-to-spec, on par with other producers of the era. They had a KT88, and it was pretty decent. (I haven't tried them myself, but apparently they're worth a go). However, after the Soviets, Tesla in Czechoslovakia was privatized and downsized. During this time, there were still production runs coming out of Tesla, but their quality was poor and some of their products were outmoded, so the company folded, and their tube division became JJ.
http://en.wikipedia.org/wiki/Tesla_%28company%29
JJ's tube designs compared to Tesla's are not much different at a glance. However, once you look into the glass, the differences are apparent - gold grid posts, graphite coatings on even the smallest parts, etc.
http://www.jacmusic.com/tesla/tesla-jj.html
Apparently, (source pending), the last Tesla KT88 runs were terrible - poor grid alignment, bad vacuum, and below-spec performance. When the company became JJ, the KT88 was redesigned to address these issues - they added giant grid-inspection holes, extra dissipation fins, and developed a new bottle.
So, all that to say, assuming your tubes are from early/reliable runs, then great, enjoy! If you're not sure, then you may want to be careful. On that note, I see you actually have 2 kinds - the glass of the right-most tube is a different shape... Weird... It's also the same glass I've seen on some Shuguang KT100 makes from the 80s-90s... Well, that's food for thought
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May your tubes be warm, long-lasting, and always lively. Holy be thy heater.
Follow Ups:
The tubes in the photos are the later production I believe. Also, having lived in the Czech Republic for many years and having had at least 10,000 Tesla tubes over the years, I have never seen boxes with Tesla "Electron Tubes" printed on the boxes (first red flag). Also a few years back there were a number of Chinese tubes introduced into the market as Tesla KT88 with print that came off very easily and boxes made from very cheap cardboard. Construction was obviously Chinese. I would be cautious of the 2 tubes on the right!
Early Tesla KT88 and KT88 Vršovice had brown bases and were as good as the GEC made in U.K. tubes.
thanks.
but i'm a bit confuse on those Tesla KT88 hence my question. too many version and too little infos
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