Quote:
Originally Posted by sclamb /img/forum/go_quote.gif
I now have the fat bottle RCA 6fd7 tubes. They are definitely better than the cleartop GE 6ew7 tubes. Great bass, wide soundstage and lots of air between the instruments. Definitely will be a favourite tube in the WA6SE. They are an improvement over the RCA thin 6ew7 tubes too as they sound more defined with a more airy sound.
Just one problem. The GE 6ew7 and RCA 6ew7 are dead silent, even with the volume turned up to max and the music paused. The 6fd7 have some backgound static with the volume turned all the way up (that faint ssshhhhhh sound). They are not black and silent like the other tubes.
Has anyone else found this with the 6fd7 tubes?
Simon
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i've noticed the same as well on the wa6SE. using a 6fd7, 6dr7 or 6cy7, the
volume range for normal listening is reduced to 7 o'clock position to 9 o'clock
for my senn hp. and 8 o'clock to 11 o'clock for the denon d5000.
these output tubes do give a faint hiss noise after 12 o'clock position on the
wa6SE (with the senns) but no noise that i can detect on the highly modified
wa6. this is with a relatively high output voltage from my source of 2.25vrms.
for the wa6SE users, i think using the low impedance jack is recommended
with these output tubes; it'll lower the hissing past noon position, which is
too loud for normal listening anyway, imo (it's louder than a rock concert venue).
these amps sound so good after a 2hr. warm up period with these output
tubes. the rca sounds thicker and lusher in the mids, whereas the sylvania
and raytheons sound more neutral and thin, generally speaking.
with some socket adapters i think i can make use of 4 or 5 other output
duo-triode tubes that have similar electronics but differently arranged
pin-outs. will work on these in the upcoming months.