KT66 Posted August 12, 2005 Share Posted August 12, 2005 I'd be interested to hear opinions from those of you that use the 6299 triode upgrade mod from CAE , permiting very low or zero FB operation of a ST70. Comments on o/p damping and residual noise/ hum are top on list compared to standard 7199 driver. Does any use the o/p stage EL34 triode modification? Comments ? Quote Link to comment Share on other sites More sharing options...
Marvel Posted August 13, 2005 Share Posted August 13, 2005 I have one of Joe's 6299 upgrade boards in my ST-70. I think it sounds very good, BUT.. The board quality is not the best (not the worst either). I think you can find better quality upgrade boards with at least as good a sound and his, and the cost will be similar. Although he doesn't have a site with pics (some in the threads on his forums though), Shannon Parks has an ST-70 driver board that looks very nice. www.diytube.com pics of the new board in this thread: http://www.diytube.com/phpBB2/viewtopic.php?t=597 Or Roy Mottram www.tubes4hifi.com I think Craig (NOSValves) used one of his boards, made some mods and like it. Bruce Quote Link to comment Share on other sites More sharing options...
KT66 Posted August 14, 2005 Author Share Posted August 14, 2005 Thanks Bruce, I've written to the contacts you suggested .. Quote Link to comment Share on other sites More sharing options...
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