#1
Hey guys,

Been lucky enough to never had a power tube go on me or go microphonic for nearly 7-years. One has gone microphonic on me.

I understand you are usually best replacing power tubes in pairs so they match or something

But I've got a 212 Valveking with 4-tubes. Do they all need replacing?

I've got stock power tubes in, Ruby 6L6's. Can I just replace the one microphonic or do I need to do all four?

It's the tube closest to V3 preamp tube.
#2
You should do all of them. They're well and truly due anyway. Btw, Ruby could be anything, they are a rebranding outfit.
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#3
As far as I know, preamp tubes can be changed one by one, but it would be best to change power amp tubes all at once. But after 7 years, it would really be the best to change them all.
#5
Quote by 311ZOSOVHJH
+1 Cath

you don't need to replace the preamp tubes until needed.


power tubes replace all 4 as a matched quad - keep the others as spares. Get at least one 12AX7 while you are it.

JJs

I owned a VK


unless you are changing the preamp tubes in search of a different tone or output (12AT7etc), the ones in there are certainly still good. i have seen tubes (a local guy i know) who has had a Telefunken last the last 40 years or something crazy like that as a preamp tube, beautiful sounding amp.

this is a good link: http://ultimate-guitar-valveking.wikispaces.com/

i owned a VK as well.

also if i remember correctly that the power tubes are fixed bias (albeit cold) so you wouldn't need to buy them, but you do need a full new set (quad).
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