Audio Research SP-10 preamp tube set, 12 NOS tubes, smooth plates, Amplitrex tested and low noise

I have for sale a tube set for an Audio Research SP-10 preamp’s (audio section). These tubes will work in all version of the SP-10 preamp.
These are the same 6DJ8/ECC-88 tubes Audio Research used in the SP-10 preamp when it was first manufactured. They are new old stock tubes (NOS) Sovtek/Russian tubes from the early to mid 1980's and have never been installed or used in equipment. The tubes are part of a 100 lot manufactures tray that was to be inserted in new equipment so the tubes do not have labels.
You get 12 new old stock tubes total for my listed price....4 ARC tested low noise tubes and 8 standard tubes. I will also include an SP-10 owners manual diagram which shows the location of the low noise tubes. The low noise tubes have the ARC red tested dot on them the red dot is the highest rated level.

The important measurement for 6dj8 tubes which Audio Research uses in it's testing is the GM or transconductance rating. All of the tubes will test over 100 GM in both sections for the GM and they are tested on a reference quality Amplitrex AT-1000 tube tester. The Emissions rating will be over 85 E for all the tubes which is excellent.
One thing that I like about these tubes, is they have a smooth plate design which helps contribute to their excellent sound. The tubes will ship them in generic white tube boxes but the four audio research tested low noise tubes will come in there original Audio Research NOS white box.

Shipping will be $4.75 via USPS first class. The tubes will be carefully boxed for shipment.
NO International sales.

If you have any questions about the tubes please email me before buying the tubes. The tubes are from the estate of an audio research employee who was friend of mine.

Please Note: Audiogon does not have a new old stock rating for condition so the tubes are rated new due to the tubes being new old stock.