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 exact tubes Audio Research used in the SP-10 when it was first manufactured. They are new old stock tubes (NOS) Sovtek tubes from the early to mid 1980's and have never been installed or used in equipment.
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 rated tubes retailed for well over $50 each thru ARC. The tubes are from the estate of a audio research employee.
The important measurement for 6dj8 tubes which ARC’s uses in it's testing is the GM or transconductance rating. All of the tubes will test over 100 in both sections for the GM and are tested on a reference quality Amplitrex AT-1000 tube tester.
One thing that I like about these tubes, is they have a smooth plate design which helps contribute to their excellent sound. The tubes are part of a 100 lot tray so I will ship them in generic white tube boxes but the four low noise tubes will come in there original Audio Research NOS white box.
Shipping will be via USPS first class. The tubes will be carefully boxed for shipment. Shipping will be a flat $7 within the continental USA…NO International sales.
If you have any questions about the tubes please email me before buying and I can give you more information on the tubes,
. 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.