Cathode Bypass caps: Ero/Reoderstein MKT1813 PI Output Caps: 22nF Mallory 150 (stock 100nF Wima MKS4) Dirty Treble pot - linear Presence pots: 10K (stock 25K) R62 L Exc. resistor -> 250K linear pot (switch at L Excursion position) Mercury Magnetics transformers