geoffbyrne Posted May 9, 2013 Share Posted May 9, 2013 I've pointed the board to articles & tests posted by Myles Rose in the US before. Myles is a genuine expert in this field & has developed testing hardware & systems adopted by the rest of the industry. He now works independently & has his own web site. You can directly ask him a question via this address (You'll need to enrol on the forum): http://forums.musicplayer.com/ubbthreads.php/topics/1351234/Feel_free_to_ask_Myles#Post1351234 He has recently tested a shedload of the standard 12AX7/ECC83 types on sale in the US (& since they all tend to come from one of only a few producers, here also). The results he has posted here: http://la-economy.blogspot.co.uk/2013/05/current-production-12ax7-tubes-ten-of.html I leave you to form your own opinions. G. Quote Link to comment Share on other sites More sharing options...
RandomBass Posted May 9, 2013 Share Posted May 9, 2013 That's useful information, thanks for posting. Cheers Geoff Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted May 9, 2013 Share Posted May 9, 2013 Ruby are rebranded whatever, most I've seen are Shuguang, you can get Shuguang really cheap. I have to bin 2 or 3 from every 24, probably same thing Ruby does. Quote Link to comment Share on other sites More sharing options...
geoffbyrne Posted May 9, 2013 Author Share Posted May 9, 2013 ....I just wish there was a cheap & easy tester so you could plug a valve in & see how near to spec it really is - remember a 12AX7/ECC83 is supposed to have 100% gain. G. Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted May 9, 2013 Share Posted May 9, 2013 Gain factor of 100 is different thing to 100%, 100% wouldn't be very much. Basic valve testers aren't super expensive, come up fairly often, I ahve a spare one, only not stuck it up for sale because I have one I'm used to using and two with better features, but I'm not familiar with, not committed settings for common valves to memory etc. They'll tell you if the valve is basically right, and amp plus ears should do the rest. Quote Link to comment Share on other sites More sharing options...
stevie Posted May 9, 2013 Share Posted May 9, 2013 Some interesting stuff about Groove Tubes on there. Worth a dig. Quote Link to comment Share on other sites More sharing options...
geoffbyrne Posted May 10, 2013 Author Share Posted May 10, 2013 (edited) I think Myles used to work with/for Groove Tubes but then fell out with them when they were bought over & packed up all his custom gear & made off on his own. He was working for them when I queried him about stuff for a Laney 30W valve amp & put me onto a guy in their (Groove) British operation from whom I got very good service. He now recommends Watford Valves in the UK (but not necessarily the cryogenic range - I think he says the treatment makes them more brittle & likely to break). G. Edited May 10, 2013 by geoffbyrne Quote Link to comment Share on other sites More sharing options...
stevie Posted May 10, 2013 Share Posted May 10, 2013 That would be Mike Cooper, I take it. Nice to see he's still around and about. Quote Link to comment Share on other sites More sharing options...
geoffbyrne Posted May 11, 2013 Author Share Posted May 11, 2013 Myles has update with 2 more brands. G. Quote Link to comment Share on other sites More sharing options...
geoffbyrne Posted June 11, 2013 Author Share Posted June 11, 2013 (edited) More updates - worth looking at - right down at the bottom. http://la-economy.blogspot.co.uk/2013/05/current-production-12ax7-tubes-ten-of.html G. Edited June 11, 2013 by geoffbyrne Quote Link to comment Share on other sites More sharing options...
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