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Questions from a Tube Preamp newbie

I have my Rogue RP-5 back from warranty repair and I am loving how it sounds. While at Rogue, they installed 4new JJ 12au7-s tubes. Sounds great. I have some questions.

1. with about 2 hours daily playing, how long do typical preamp tubes last (I have heard Rogue's, like CJ, can be hard on tubes)

2. Do new tubes need broken in? if so, what is normal time frame?

3. Does tube rolling really make a difference on a preamp vs power amp?

4. What is the general concensus on JJ tubes for a preamp? Again, I am really happy with the sound, so I probably won't change. However, I will eventually probably get the itch.

Thanks
aberyclark

Showing 1 response by lous

lous's avatar
lous
207 posts
 
Hi Abery,

1. It really depends upon the preamp and the quality of the tubes.

2. NOT that I have noted, but I am no expert.

3. A tremendous difference. I'd seriously look for some Telefunkens. I can't be sure about the 12AU7's, but I think Telefunken's pretty much own the 12A-whatever family. 6DG8's I tend to prefer Bugle Boys for warmth and Siemens for detail, YMMV.

4. JJ's are likely pretty good for the mostly crappy tubes made today. While most things, like cars, televisions, etc. have improved, I suppose due to low demand tubes have gotten worse, much worse in some cases than the really good older tubes. Mind you, I said really good older tubes, many brands were no better than what you can buy new today.

Hope this helps.
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