I got this amp from a guy who knew nothing about it and I'm trying to find out a little more about it.It seems to be some type of home brew amp with no brand name on it.It holds 10 tubes.Looks like 4 driving 6.After a lot of research on the web,the closest thing I can compare it to is the d&a phantom sweep tube amplifier.The parts layout is nearly identical except on the phantom all 10 tubes have the wire caps that clip on the tops of the tubes and this one only has the caps on the 6 driving tubes.I would like to know what kind of tubes this originally ran on and if there are any substitutions for them.Are all 10 tubes the same or are the 4 pre drivers different from the 6 drivers.I have included a couple of pics in hopes that someone will recognize this amp and maybe pass on some useful info.Thanks for taking the time to read my post and have a great day.Alex.