NOS Mullard 2X Tungsram 4X Tubes Platinum 12AX7 MCintosh 2300 2500 only selling as a set first fair offer takes it!

This is a platinum grade NOS tubeset purchased, but not used for my
recently sold Mac C2500 preamp. The Tungsram 12AX7's are 1976
industrial grade "red serial number" and are triode matched and graded
by Tubemonger. They cost $245 for the quartet. The Mullard 12AX7's are
60's vintage and are platinum triode matched by Upscale Audio. The
cost $285 for the pair. These have been burned in, matched, but not
used so they have less than 24 hrs of use by the seller. Both
Tubemonger and Upacale are reputable sources for the highest quality
tubes and the Tungsram/Mullards are as good as you can afford! The
Mullards are a slightly warmer sounding tube and can be used in the line
sockets to warm the sound a little, or in the MM sockets to warm the
phone preamp section. My price is fair  3% for PayPal, but I
will ship for free. Take your C2300, or other 12AX7 preamp to the next
level. Chinese tubes simply cannot compare.