Up for sale is a premium matched pair of Amperex-labeled Mullard Blackburn 12AU7A / ECC82 vacuum tubes, both carrying matching B3H4 etched Blackburn factory/date codes. These were manufactured by Mullard Blackburn, England, and labeled for Amperex.
Item Category: Vintage Electronics
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12AX7 ECC83 Matsushita Japan Preamp Tubes. *PAIR* Matching codes. Strong
They are marked “Made in Japan” on the glass and have mtching production codes of “6 I”. They have short gray plates and a level halo getter. The tubes are very clean with good markings. They are in labeled new white boxes.
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Sylvania JAN CHS 6SL7GT VT-229 Bad Boy NOS 1952 – 51 Matched Pair
Excellent pair 1951 and 1952 Sylvania CHS 6SL7GT preamp tubes. Min good value is 32 for these tubes.
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Pair of RCA 6SL7GT/VT229 Preamp tubes
Pair of matched RCA 6SL7GT/VT229 Dual Triode Preamp Tubes. where minimum is 32. Tube 2: 56/59.
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NOS JAN Sylvania 5814A Code-Matched Quad 10-74 Platinum Matched Low Noise
These are closely matched for both gain/mu and mA/V transconductance, with very strong low-noise results. This quad is very tightly matched on mA/V, with all sections testing between 1.50 and 1.54 mA/V.
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1963 GE JG-6189/12AU7WA PLATINUM PLUS Triple Mica XSR Preamp Tubes Matched Pair
Silver Grade tubes are matched within 20%, Gold Grade tubes within 15% and Platinum Grade 10%. You are purchasing a ” Platinum Plus ” grade matched pair of tubes. The price listed is for one pair of tubes.
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Mullard 7247 Matching Pair Blackburn UK Preamp Tubes
Eico by Mullard. We cannot be responsible for what tubes test in another tester.
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Quad Set (4) GE Hammond Short Grey Plate Top Halo 12AU7A 12AU7 Preamp Tubes
These are grey short plates with top halo getters. Using my tester where any reading above -50- is considered GOOD, this scored a very strong readings of 70/70 – 69/69 – 66/66 – 69/69 with no shorts and are ready to use for your next audio project(s).
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RCA 5751 Triple Mica Black Plate Pair Preamp Tubes
We cannot be responsible for what tubes test in another tester.
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(2) Sovtek 12AX7LPS ECC83 Preamp Tubes Excellent Cond Test NIB Amplitrex
Tested on an Amplitrex AT1000.