My friend Fankie had a Caswell modded marshall in the 80's and it absolutely sucked balls IMHO. I jammed with him once and I used my JCM800 2210 with a graphic EQ in the loop and he used his Caswell Modded Marshall. That jam session caused him to sell the Caswell and Buy a 2210.
I have experiance with Mark Cameron mods,Lee Jackson Mods,Caswell Mods, Jose Mods, Heavy Metal Joe mods and Harry Kolbe mods.
The Cameron Marshall mods smokes them all IMHO.
The Lee Jackson mods were hit or miss. I owned one for many years and had it re-modded by Dave Bray. My Lee Jackson mod sucked whereas this other guys sounded amazing. Lee basically did one mod at the time and it seems as if he did not take the time to make sure they all sounded the same becuase they did NOT.
The Caswell mod sounded crunchy in a bad way. It was very shrill and had a more gain then stock but it was in no way a musical sounding amp. I have only heard one so that's not to say that someone else had a different experiance.
The Old Jose Mods were also hit of miss iMHO and Jose had more then a few mods. Not just one. The one I heard sounded like ass and pretty much sounded like the tone Mick Sweeda got on the first Bullet Boys disc. Sounded cool for rhythm but when you went for a solo, The amp choked out.
The Jose modded amps that John Sykes uses are killer IMHO. I would be willing to bet that it was a different mod then the one I tried.
I believe Steve Sah5150 has a lot of experiance with the Jose mods and so Deos Mark cameron of course!! I think Steve and Mark can chime in although so we can hear some stories about the master!
I wont even mention Harry Kolbe's mods. I don;t think Kolbe gets high gain and his marshall mods were horrible sounding IMHO. That said, Harry worked on all my amps in the 80's just re-tubing and biasing / service. His service was top notch and my Stock amps always came back sounding better. I hear that his Fender mods are killer but I never heard them.
Heavy Metal Joe was my tech after Harry Kolbe. He worked for Marshall in the late 80's and did worl on the side for me and many others. Joe was rumored to have designed the Jcm900 series but he never got the recognition nor did they use his design. I think they just used his idea of a high gainer. IMHO it was a shame because his amp killed the 900 series hands down. That said, his amps were based on diode clipping just like the 2210 but with much more gain on tap. The problem was that it had a sizzle to it that could not be dialed out thus making me look elsware in the mod world
