These were purchased as a back-up and never used. This quad is from 1980s. $995 shipped. Please see my 25 years of excellent feedback under mikeg on Audiogon. I only take PayPal friends and family.
The used quad (last two photos) was in my preamp with about 70% use life left. $650 shipped.
As a note: The DR tube was manufactured with gold wired grids. The Pi is not. There is both a lifespan and sonic difference between those structures.
DR tube lifespan: 10,000 hours
Pi tube lifespan: 4,000 hours
If you have an ARC preamplifier or amplifier that uses the 6H30 tube and you did not have access to the 6H30DR original military version, you need to get them now, while you can. There is no comparison between the 6H30DR and the current production 6H30Pi. They are apples to oranges.
