Email them. I’ve biased amps for years using the red-plate method. Dim the lights. Power up. Adjust so that the tube anodes (plates) just start to glow red. Now back off a little so the glow fades away. Check current. Recheck current and bias adjustment after 30 mins. You can tweak it back a little and compare by listening if you want to run them even cooler without sacrificing SQ.
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WOW that is high for a single KT88, that a pair? at 110 MAX and 90 for 8417, The KT88 again at 80ma, that has to be a pair.. I think I'm right.. Tell me if I'm not... :-). 28-45 ma covers almost ALL power valves.. I use.. 6V6, 6L6, EL34, KT, 66, 77, 88, 90. and 6550s. You go higher than that.. Tube life goes WAY down.. You should be able to get 2 years at 20 hours a week...2080 rule.. 40 hour work week...1 year... Turn on cycles play a part after 20 hours a week.. 10, 5 so on. 4 years pull, inspect and check... Time to be a little more aware.. <<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>> noromance5,041 posts01-17-2021 11:26amEmail them. I’ve biased amps for years using the red-plate method. Dim the lights. Power up. Adjust so that the tube anodes (plates) just start to glow red. Now back off a little so the glow fades away. <<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>> I thought I knew something.. Petty clever. I use a dark room to see problems in my valve amps.. Sure shows any little problems.. I use to do the same on Equipment, chasing a LVDC ground issue, or direct short to ground.. Breaker popper in certain positions.. The dark is your friend.. Regards |
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