Description: each slightly different cosmetics, but brown base, T12 bottle. test good with life remainingone appears to have '6037' code, darker brown Bakeliteother '537' code, 5881 stamp on dome, lighter tan base Tubes are tested on a B&K 707 mutual conductance tube tester recently serviced and calibrated by Mike Mabry in Woodland, WA. Mike has been working on this series of testers for many years. The tube tested as follows, for each side, where the first number is a scaled Gm and the parenthetical number is life rating; a Gm rating of approx. 66 or higher is considered "good": 537: 93 (90) 6037: 86 (82) The test ratings on this type of B&K tester may require a bit of explanation. Their "life test" is considered "good" if the meter rating is within 25% of the Gm rating. e.g., a tube with a mutual conductance (scaled) rating of 80 would still be passable if the life test registered a 60 on the meter. Most of their test settings correspond with a 0-120 scaled reading where the "good" area is about 66 and higher on the meter. If you want to combine tubes for a shipping discount, this is possible if you wait for an invoice before paying for any winnings. THANK YOU for looking!
Price: 65 USD
Location: Portland, Oregon
End Time: 2023-12-21T00:04:14.000Z
Shipping Cost: N/A USD
Product Images
Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Brand: Tung-Sol
Type: Vacuum Tube
Model: 5881
MPN: Does Not Apply
Country/Region of Manufacture: United States
