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In Reply to: RE: Warmer sounding output tubes in VTA 70 posted by airtime on August 17, 2016 at 07:29:19
I take it you are looking for a "warmer" midrange tone. Maybe a tad rolled off treble response?
If tube rolling is what you wish to try... maybe look at those 12AU7 tubes. You know anyone that has CBS-Hytron 5418A or 7316 tubes to try? IME, these about the best for the tone you seem to seek. Black plate version preferred. Very good tubes.
Next choice to try maybe the 1950-60s Mullard (Blackburn) or Philips (Dutch) ECC82.
Kinda hard to find good examples of these tubes. Would really be nice to try them out in your amp, before searching the World to find a good set.
Not sure what coupling caps and types of resistors VTA used in your amp. Endpoint voicing could come down to experimenting with specific component types in strategic locations within the circuitry.
Good luck!
Follow Ups:
EH 6ca7's always sound great in any stereo that I've tried em in. You'll have some fun with em.
It uses metal and carbon films in sensitive positions on the driver board. I'm assuming metal film in path for clarity. coupling caps are K-40 Russians.
I really don't want to start swapping components just tube roll. You are very correct and also reflecting what Bob said about how you can get the most effect by changing the center splitter tube on the driver board.
The driver tubes that came with it were GE 12AU7. One GREAT tube! I tried a few other vintage brandings but my findings in general were a rolled off top end and some degree of clarity degradation. LIke Sylvania, RCA non black plate, RFT, think that's it? The new production TungSols were excellent.
Charles,
You might like the 6CA7 EH output tubes. Have you tried them?
especially if you get the ones that test at a higher GM. There is nothing I could fault with that tube,especially when they stomped on my NOS Mullard XF1s and XF2s.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
No I haven't but I always liked the sound of EL34s. Worth a try. Don't get me wrong the KT66 are wonderful. The beauty of tubes IS rolling!!!
I just moved and I'm SURE there are going to be a few broken tubes to reorder.
Let me unpack and see.
Eli post of possible candidates I had my eye on. My goal is a little vintage sound to match up with my CJ. I already have amps that are razor sharp and new. I miss that vintage sound. My Sherwood fills the integrated slot but I need something to pair up with the CJ.
charles
The Shuguang KT66z may be just what you are looking for. They are 'richer' than the GL KT66.Alternatively, search for Arizona capacitor. These look like modern Vitamin Q's and they hail from Westcap.
Edits: 08/21/16
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