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Vac Sig MKII tube circuit upgrade

Anyone have the tube circuit board upgrade on their pre's done.
I want to have mine checked over as I bought her used.
Figure while she's there might as well do the upgrade as that will also give me more tube choice.

Anybody have any thoughts on this.
128x128drummermitchell
jwm
918 posts
 
I'm not aware of an upgrade to the Sig. 2A, his website does not say there is an upgrade as well.
drummermitchell's avatar
drummermitchell OP
262 posts
 
I believe just the MKII as the IIA has that tube swap option installed already.
peter_s
1,335 posts
 
I believe Drummermitchell is right about this.
knghifi
1,668 posts
 
04-11-12: Drummermitchell
I believe just the MKII as the IIA has that tube swap option installed already.
Drummermitchell (Threads | Answers | This Thread)
Not true. Only the later Sig MKIIa has the tube swap option. I ordered my Sig MKIIa in mid 2011 and it has the option.

I spoke with Kevin and there's no circuit change, just a switch out of the signal path to deliver 6.3 or 12.6 volts depending on the tube type.
jwm
918 posts
 
I hear the IIA is going to get a stellar review in next months issue of the Absolute Sound.
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