The GR Super 10 is a special build, Glenn offers a similar one check this review: http://www.tweak-fi.com/apps/blog/show/42754587-building-a-reference-system-part-2-glenn-s-headphone-amplifier I have never run my GR Super 10 with 5998's yet. The amps that have the 5998 mod can run them at their optimum. I don't know many amps, apart from Glenn's that have this. Rule: Amanda is right. Tubes can be very evil and addictive, you have been warned.
3/23/15 at 5:36am