You wrote in another thread:
I suppose my Dynaco MK3's would qualify as vintage if they weren't so modified. Only the transformers and output tubes are the same. I'm still using 6550's although they are not the original tubes.
I didn't want to threadjack, but I am curious about your MkIII mods. What are they? Did you DIY, build kits, have them done?

Thanks for any info you can provide. I just got a ST 70, and I can tell I will be playing with Dyna stuff for quite a while.

-Jon