Mullard Blackburn ECC35 Brown Base B8B 1958 Strong Balanced Tested 6SL7

Very nice Mullard Blackburn ECC35 brown-base dual-triode vacuum tube, carrying the B8B production code, dating it to 1958.

The tube appears to be new old stock based on its exceptionally clean condition, strong original markings, and excellent test results. However, because its complete history is unknown, it is not being guaranteed as unused NOS and is being sold as a premium tested vintage tube.

Tested on a MaxiMatcher II preamp tube tester:

Gain: 69.5 / 70.9

Transconductance: 2.02 / 2.12 mA/V

Both triode sections test strong and are very closely balanced. The tube was also checked for noise and excessive microphonics.

The Mullard ECC35 is a highly regarded British tube in the 6SL7 family, prized for vintage hi-fi equipment, preamplifiers, amplifiers, and restoration work. Buyers should verify compatibility with their equipment before purchase.

Desirable brown base, clear original Mullard markings, Blackburn production, and excellent electrical balance. The original box shows normal age and storage wear.

Carefully packed for safe shipment.

Money-back guarantee if this tube does not satisfy you.