[Gopher]

I have a wonderful quad of HP branded Amperex 6dj8 tubes which I have been using and loving in my Audion preamplifier. I've put a fee hundred hours on them as did the prior owner of my preamp who bought the tubes NOS.

Though i dont have a tester, they are quiet and should be good to provide listening enjoyment for several years to come.

I'm only selling these beauties becase I splurged big time on some Amperes 7308 white labels 

Take the quad for $100 shipped CONUS

[Gopher]

For those not familiar with these tubes, Hewlet Packard was known for rejecting 99% of the proposed Amperex tubes as not meeting their standard.

The HP branded Amperex's really are top notch tubes.

[bunky]

what year are they ?

[Gopher]

I'm not completely sure how to read the date codes but they are labeled:
221
218
226; and
2xx  (difficult to read)

They sounded great in my Audion preamp--very nice tubes, but I picked up a quad of 7308 PQs