Help with 50 caliber plus!!

Hi all..I just sold my 50 cal plus on ebay and the buyer isn't happy with the gain. I had it serviced at home and where the buyer lives. Caps, reverb, push pull and preamp tubes have been serviced. Before I sent it out..I thought the gain was a little lacking but I chalked that up to having cleaner preamp tubes. I used the amp clean with pedals. I'm 450.00 dollars on service cost now and may have to take the amp back. Any ideas on the gain issue?? Here is a video on a 50 cal the buyer sent me on what the gain should sound like..Is this amp stock?
Thanks for any help!
http://www.youtube.com/watch?v=Y9UaxQul0r0&feature=youtu.be

Sound like a stock amp to me

What gear the buyer have ?

Yes..you are correct but the gain on my 50 caliber+ does not sound like that! Even after tube changes, caps, etc..

To make it sound like that, the amp need to be first really hot physically and you need a good guitar with a good output volume.

If you or the buyer don't have experience with settings, a good play/ dynamics and good instruments.. You can't even come close to it.
(no offense there :? )

I have the same problem with my 50 cal. I hope someone can offer some good advice. I'm sick of spending money on it and it not being fixed.