NOS matched pair of Genelex (Marked Mullard IEC) KT-88 power tubes. The orig boxes were not available when I received them, but the tubes have not been used other than on testers. Flashing is perfect with 3 total getters. Black plates with support rods. Tested for transconductance on a calibrated Hickok 539C and for current draw on a custom made matching tester. Testing for current draw was done with both tubes together on the tester…as in an amp under load. Readings show a 97.2% match on current draw.
Test parameters: 400 vdc plate voltage with G1 bias voltage of -40.0 vdc.
Minimum transconductance value on the 539C is: 6250 mmhos.
Tube 1: 12500 mmhos and 55.2 ma. Date code: 1022-652 (1976)
Tube 2: 12500 mmhos and 53.6 ma. Date code: 1022-720 (1977)
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Tubes will be packed very well! Shipping cost is actual dependent on ZIP code. Insurance is mandatory.
If you have any questions about these tubes....please ask. Thanks!