dont worry about it, mine has a silver coating on top, after 100 plus hours of use

the caps in the newer version of the WA22 (with phrase spliter), is using a 0.47uF cap. i changed mine to a 0.22uF cap. There is a good change in the sound stage when the coupling cap is swap out, Jupiter caps have a nice warm, natural and rich sound, without slouching on the details.

here is the pic!

where you got those caps!! im looking for them too

im still hunting for the tubes you mention there, its hard to get tubes in Singapore, specially the GZ34 metal base,  currently running GE6080, NU 6F8G and brimars 5Z4GY

Christmas came early for me! got a WA22 with LCD X head phone. totally amazing thanks to all the great people at the forum, reco all the great tubes!   due to some reasons i cant post any pictures of it, i will post some as soon as possible!