I just came to acquire a 64 AC30! Woohoo. Works for the most part well! The amp from what I can tell was an AC30T. The OT was replaced with a "Sampson-Perrota" replacement OT, I guess Mark Sampson may have rewound the original Albion? The choke is Albion and the PT is original. From reading: http://www.voxshowroom.com/uk/amp/ac30_6_hood.html, it seems that the AC30T had 220pf bright caps across all three volume pots. When I opened up my amp, I see three bright caps, what the values are, I don't know. They look original. According to this site, the AC30N did not have these bright caps. This amp has an add on Top Boost........ and with the bright caps, which I'm assuming are 220pf, it is extremely bright, which is why I started investigating.... which got me thinking. When people sent their amps into Vox for Add on Top boost, and they were varying models (Bass, Treble, Normal), did Vox change the caps? The coupling, bypass caps, and treble cap values vary from Bass to Treble To Normal. If you just pop in a TB on an AC30T, it's going to be very bright. What would be the appropriate cap values to use with a Top Boost AC30? What is the standard?