I have the Sennheiser HD-600, I use them with the MG Head DT OTL amp. Instead of the stock tubes, I suggest 5751 in lieu of the standard 12AX7for the preamp end. Replacing the power tubes did not make a significant difference in my system.
Remember the three mica, blacks 5751s are the best. Among the better ones are NOS (new old stock) GEs, Raytheon, are telefunkin. The ultimate 5751 is said to be the Syvania Gold but I have not heard it. It commands a premium price too.
Read Joe's tube lore on the web - that is where I got most of my info.
Even with the stock tubes, this system sound wonderful so don't splurge before listening. Incidently, I have seen the MG Head DT advertised for $ 150-200 used on Audiogon. The Sennheisers have been advertised for $ 239 New.
Always listen first.
Erider
Remember the three mica, blacks 5751s are the best. Among the better ones are NOS (new old stock) GEs, Raytheon, are telefunkin. The ultimate 5751 is said to be the Syvania Gold but I have not heard it. It commands a premium price too.
Read Joe's tube lore on the web - that is where I got most of my info.
Even with the stock tubes, this system sound wonderful so don't splurge before listening. Incidently, I have seen the MG Head DT advertised for $ 150-200 used on Audiogon. The Sennheisers have been advertised for $ 239 New.
Always listen first.
Erider