While performing an audio tap test on the Maxi Preamp through a guitar amp Triode A tested good when tapped, Triode B tested excellent when tapped. Tester 12AX7 Expected Gain (Mu) value = 92. 12AX7 tubes have a center design target of 1600Gm.
Item Tag: 12AX7
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ECC82 12AU7 Brimar Black Plates Red Tip Selected Pair
Very rare Brimar selected red tip matched pair 12AU7 tubes with black plates and top [ ] getter made in the 1950’s. Tubes tested: 99.3/102.4, 106.4/100.5.
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NOS/NIB RCA 12AX7/ECC83 TWEED BLACKFACE FENDER 1969 TEST NOS
MATCHED PAIR NOS/NIB 12AX7/ECC83 MARSHALL PLEXI TWEED FENDER 1969 TEST NOS. Nice Shiny Getters Both marked DB Condition is “New”. Shipped with USPS First Class. All of our tubes are tested by our resident expert on a Hickok model 605 tube tester.
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RARE MULLARD NOS/NIB 12AX7/ECC83 MARSHALL PLEXI TWEED FENDER 1967 TEST NOS
RARE MULLARD NOS/NIB 12AX7/ECC83 MARSHALL PLEXI TWEED FENDER 1967 TEST NOS. Condition is “New”. Shipped with USPS First Class. All our tubes are tested in house by our resident expert on a Hickok 605 tube tester as pictured.
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2PCS 9 pin RED B9A Bakelite Vacuum Tube Socket Valve Base For 12AX7 with shield
You get – 2PCS 9 pin RED B9A Bakelite Vacuum Tube Socket Valve Base For 12AX7, 12AY7, 12AU7, & others with shield
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2PCS 9 pin BLUE B9A Bakelite Vacuum Tube Socket Valve Base For 12AX7 with shield
You get – 2 PCS. 9 pin BLUE B9A Bakelite Vacuum Tube Socket Valve Base For 12AX7 with shield
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Quad of Raytheon 12AX7 Black Plate Vacuum Tubes – 6% matched
Quad of Raytheon 12AX7 tubes, screened and labeled for Baldwin organs. These feature long, shiny black plates and O getters. Constructed with mica spring “fingers” on the cathodes to reduce microphonics.
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Quad (4) GE 12AX7/ECC83 Long Gray Plate Made in USA
Long Gray Plate. 1 tube have D-Getter. Made in USA. Tested in my preamplifier to make sure working as intended with no issues at all. with no shorts, leakage or gas. ____ ______. where minimum good value is 875.
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12AX7 RFT EAST GERMANY ECC83 VINTAGE TUBE *eTRACER* #4
Tested on our eTracer curve tracer on a full curve map. RFT ECC83 12AX7A. Date codes for RFT are difficult to pin down, but these were likely produced in the late 60’s to early 70’s. Triode #1 – Plate Current = 0.94mA Rp = 70705 Gm = 1508 Mu = 106.6 Corners = PASS.