Very very funny: After some tube rolling, I finally prefer... the stock tubes : RAYTHERON 3S4 + RCA (1U4 or 1T4)
I find more fun and better gain in the stock tubes. More bass also ! I guess I have been very fortunate to get this unusual stock tube set.
But... how can I know if the RCA are 1U4 or 1T4 ? I can read on them "made in USA 64EX4" and the gain is really better than with the other tubes (I listen at 12 O'clock with them when, where for the same sound level, I need to set volume at 3 O'clock with all other combination). Can it help ?
So far I have tested :
- Combination 1 : Sylvania 3S4 + Tungsram 1T4T
- Combination 2: Mullard 3S4 + Tungsram 1T4T
- Combination 3 : Mullard 3S4 + Siemens DF91
I know I will one day test more combination (I have 2 siemens DL92 to test with those tubes, and I will also test the "famous" philips dl 92 (3S4) + telefunken df904 mil spec (1U4)... when I can get my hand on them.
Question: is the "milspecs" important for the telefunken df904 ? All i can find so far is apparently "NON MilSpecs" !
Anyway, I will listen to your advices and give my hears some listening time with the stock tubes before I start again some tests
thanks to you all....
Edited by bmichels - 7/22/13 at 12:36pm