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These are original NOS Made in USA Tung-sol 5881. All have the same manufacturing lot code 322DZ3. All tested good on Hickok 539B. I have these for a long time and is now clearing out my tube collection. $250 for all 5 tubes including Paypal fees and shipping to contiguous US states.
Below are measurement done on a Hickok 539B. They all are fairly close and I would say that they are within 10% of each other. Do note that ideally, tube should be matched at their operating point specific to your application. However, this gives you an idea that they are within the same range.
These are original NOS Made in USA Tung-sol 5881. All have the same manufacturing lot code 322DZ3. All tested good on Hickok 539B. I have these for a long time and is now clearing out my tube collection. $250 for all 5 tubes including Paypal fees and shipping to contiguous US states.
Below are measurement done on a Hickok 539B. They all are fairly close and I would say that they are within 10% of each other. Do note that ideally, tube should be matched at their operating point specific to your application. However, this gives you an idea that they are within the same range.
Vpg is grid to plate voltage. All measurement was done after 10 minutes of warm up on the tester. |
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