Mullard 12AX7 / ECC83 Quad Tubes Matching Dates Hickok tested Blackburn 1961

Description: Beautiful matched quad of Blackburn Mullard ECC83 / 12AX7 vacuum tubes. These are labeled Bogen from an AP-200 amplifier pull. These are highly sought after tubes, and rare to find in a matched set of 4 with the same date codes. Date codes: I61 (ECC83 1st engineering batch) B1 G2 = B (Blackburn) 1 (1961) G (July) 2 (2nd week). These tubes were made in the Blackburn factory in the UK in July 1961. ALL TUBES HAVE MATCHING DATES. Tested on a calibrated Hickok 539C: 1950/1950 1890/2500 2200/2200 2150/2000 The minimum gm for a good tube is 875. These are nice balanced tubes that test very strong. I pack extremely well, these tubes are guaranteed to arrive in the condition described.

Price: 400 USD

Location: Watertown, Massachusetts

End Time: 2024-09-20T17:57:46.000Z

Shipping Cost: 0 USD

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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: Mullard

Type: ECC83

Model: 12AX7