Advice on Tubes
Called today asking about using the Western Electric 300B B Stock tubes with my Elekit TU-8900. Best help I have gotten on the subject. Hi IB’s are over 90 ma, lo IB’s are under 40. She told me that while the Hi IB’s might sound best for a time they would put strain on the resistor and the output transformer possible leading not only to resistor burn-out but possible permanent damage to the OPT’s caused by core saturation from running at high levels over time. She recommended the Lo IB tubes for the TU-8900, They might lack in power and base and mid-range saturation in comparison to the Hi IB tubes but the differences are small and the tube overall is very good. Operating power would be similar to running the 2A3 in the same amp. The Lo IB’s would put no strain what so ever on the amp with no risk of damage. Five stars for Michele at Tube Depot!
By Bruce B.