The ruggedized, very low microphonic industrial version of the 12AX7. Vintage, U.S.A.-produced, triple mica, round getter, gray plates. Some of the labeling is worn, but the GE dots and "5751" are in great shape. Tests new on Triplett 3444. Results, at 250 plate volts and -3V fixed bias: 1125 micromhos/0.85mA and 1050 micromhos/0.89 mA. New is 1200/1.0, so this tube is at 94%/88% of new for transconductance, 85%/89% for anode current. Beautifully balanced triodes within 7% for transconductance and within 5% for anode current. No shorts or leaks. Sorry, I only have this one. Ships at $8.99 flat rate USPS Priority Mail to lower 48. Will come in new white box with full test results on label. Guaranteed not DOA. If any issues, I will make it right. Payment via PayPal.
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