Dan,
I have not compared the Tele smooth to the ribbed. Each time I have gotten more Tele's, I have tried them in the Io's input stage hoping they are super quiet like the Ei's, but so far such a quad (or even a pair) of Tele's has not crossed my path. So I have simply replaced the stock tubes with the newly arrived Tele's and enjoyed the improvement with no attention to which type of Tele it is. I guess I will have to do this next time I have an itch to tinker with the tubes. If you are interested, I could loan a pair of each to you.
And one more thing: I have tried the Amperex 6922 in the Callisto and the Io and this tube just does nothing for me. It was lifeless and in fact a bit fatiguing. I always prefered the RAM and Sovtek tubes to this in the ARC LS5 that I ran with for years as well. YMMV. But oh how sweet the Mullard 6922s are in the Callisto and in the CAT amps.
John
I have not compared the Tele smooth to the ribbed. Each time I have gotten more Tele's, I have tried them in the Io's input stage hoping they are super quiet like the Ei's, but so far such a quad (or even a pair) of Tele's has not crossed my path. So I have simply replaced the stock tubes with the newly arrived Tele's and enjoyed the improvement with no attention to which type of Tele it is. I guess I will have to do this next time I have an itch to tinker with the tubes. If you are interested, I could loan a pair of each to you.
And one more thing: I have tried the Amperex 6922 in the Callisto and the Io and this tube just does nothing for me. It was lifeless and in fact a bit fatiguing. I always prefered the RAM and Sovtek tubes to this in the ARC LS5 that I ran with for years as well. YMMV. But oh how sweet the Mullard 6922s are in the Callisto and in the CAT amps.
John