Vf 6.3 Volts / If 0.3 Ampere. Sharp cutoff pentode suitable for use as R. F amplifier, limiter, or sync separator. Sony C37-A Song C800 and C800G ALTEC M11 “coke bottle” mic. Sansui 1000A McIntosh MX110 Fisher 800 [from 800B] Scott 330D McIntosh MR67. Tested on UM-18 computerized military tester. We have hundreds of thousands of tubes for manufacturing purposes, all vintage american made. 2 If you are looking to re-tube and amplifier, guitar amplifier, preamplifier, compressor, equalizer, microphones or any tube equipment, send us the model number and we will take care of the rest, and generate a custom listing for you. 4 We carry most USA made brands such as RCA, GE (General Electric), Sylvania, Raytheon, TungSol and PentaLabs , just to name a few. 5 We also carry european brands such as Amperex, Mullard, Telefunken and Marconi , just to name a few but in less quantities.