I am wondering as power tubes age which way does bias go up or down ?
1979 Marshall 2203 Jet city JCA 50H Splawn 2012 Quick Rod Splawn 2011 Quick Rod #2 Line 6 (birch) A cab 1972 MArshall A and B cabs with original Greenbacks 1978 LP Deluxe routed 1980 LP Standard 2016 LP Traditional 2019 LP Classic H Burst Warmoth Strat w/ Floyd 2017 Gibson SG