I did buy it off ebay but added the R2 mod after I got it. I'll have to check the serial number when I get home.
I installed the EQ from a mark 2 so it was pretty much a drop in addition, had to extend some wires for the long chassis though.
I'm a bit of a gear collecting nerd and when I see good deals, I can't pass them up, sure my credit card is a bit high but it will work out and if worse comes to worse, I could sell pretty much any of my stuff for a profit.
That SVT I got for 500 but had to do alot of work on it. It still has the 6146 tubes and is a great amp.
I also have a traynor YBA-3A , a fender 400ps, a mesa 400, strategy 500 power amp, and a mark IV.
I'm an electronics tech and have worked on my amps for about 10 years now and like getting amps cheaply just to take apart and see how they work, do a few tweaks, clean them up, check the tubes etc... and sell them once something else comes up that I would rather have. Most of the things I have right now are staying.
I have several projects waiting still: a traynor yba 1A, ampeg v4's, etc....
The really stupid thing about all the equipment I have is I am not playing with anyone right now but usually play pretty loud, heavy, stuff but love having good equipment to play it with.
Anyway, not trying to brag or anything, just proud of the stuff I have.