trendkill1168
Well-known member
Spoke with Bruce Egnater today. For all of you who do not know him he is the guy that designed the RM100, RM4, & RT2/50 for Randall. I asked him if it would be safe to run the KT88's in the RM100 or RT2/50 due to the higher bias settings and he told me that it would not be a problem at all. He told me that the RM's run off of a 500 plate voltage and said that everything was pretty "heavy duty". I should also mention that he is a very nice guy and was more than happy to help.
According to Bob at Eurotubes he uses this formula to figure the bias settings: Take the plate dissipation of the tube (35 watts for the KT88) and divide it by the plate voltage of 500 for the RM. Then multiply that times .7 (this figure will get you out of crossover distortion according to Bob).
So 35 divided by 500 X .7 = .049 so the KT88's would be biased at 49mA.
I bought a pair of KT88's from Eurotubes and got them in today so I'll give them a try tonight and post back my results paring them with a set of E34L's. Should kick ***!
According to Bob at Eurotubes he uses this formula to figure the bias settings: Take the plate dissipation of the tube (35 watts for the KT88) and divide it by the plate voltage of 500 for the RM. Then multiply that times .7 (this figure will get you out of crossover distortion according to Bob).
So 35 divided by 500 X .7 = .049 so the KT88's would be biased at 49mA.
I bought a pair of KT88's from Eurotubes and got them in today so I'll give them a try tonight and post back my results paring them with a set of E34L's. Should kick ***!