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This Post Has Been Edited by the Author
There are 2 ways to modify TU-8200's output mode.The following photos are copied from
http://mtomisan.cocolog-nifty.com/blog/2014/02/tu-8200-53d5.htmlFrom 6moons Review
David just bits the bullet and drilled two 15 mm holes on the top panel. Now changing settings for triode/UL/pentode is so much easier.
He uses wood plugs for covering the holes. Also added screws to secure the tube cages.
Edits: 06/28/14Follow Ups: