Hi Jazz. Unfortunately...My typing skills are zero,I never did learn to type, not to mention that I'm a "certified moron" on these damned computers.I type with "one finger". hehehehe.....Hell if the keyboard didn't have the letters marked on the keys I'd have no chance at all! Yes, you have probably noticed how much longer the 6106 takes to power up the preamp when compared to other rectifiers. It also seems to take the supratek longer to warm up sonically with the 6106 in it. Furthermore, the 6106 operates at a lot hotter temperature [by design] than any of the others. When it's removed and cools down, unfortunately you will have to wait another 30 to 40 minutes for it to optimize the preamp. Another interesting observation.....About 6 months ago... I replaced my old 6106 in the cortese with a brand new 6106 and it sounded just dreadful,imparted a glare to the preamp that was unbearable to listen to. To run it in I powered it up [24/7] for a couple of weeks in the power supply of the syrah [unattached] and it still sounded rather thin by comparison, but the glare was almost gone at about 100 hours. It took a total of nearly 300 hours for it to fully flesh out.I loaned it to another supratek user[syrah] and he loves it paired with the 6f6g's in the regulation position. Yes sir: the 6K6g is another small power pentode that is a very good alternative tube option for regulation duty in the suprateks, however.... these were all originally made in either metal envelopes,st bottles or short glass gt types... the only 6k6 that is any good in our preamps are the earlier bottle shaped G versions with the round plate internals. The 6K6 metals are no good, the 6k6gt's are better but the G versions are the tube of choice. Note: There are a lot of other small pentode tubes from that same family that we can substitute for regulation duty in our preamps. Most of this family of pentodes... like the 6f6,6L6,6K6,6U6,6v6,1621,5871 can be used for regulation duty in the supratek and many are very gound sounding valves when used as an output tube in a good amplifier. However.... most of them were originally designed in either metal envelopes or glass bottles. My experience with them..... stay with the bottle types as none of the metals sound very good. Another superb tube for regulation duty is the 1621. This tube was used in the amplifier of wurlitzer's top model jukes, as well as some early Western Electric amplifier circuits.
