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Rolling pre tubes question

Hi all,
A few questions from a novice tube roller. I have a Manley Stingray II and have been playing around with the pre tubes.

1. Should amp be turned all the way off, or is stand by OK when changing tubes ?
2. Tubes that have paper labels glued on them  ( Brimar CV 4033 ) OK ?
3. Can input tubes ( 12 at7's or the Brimar CV 4033's ) be substituted for the driver tubes...6414's ? I have read that       6414 can be substituted for 12 at7's but what about visa verse ? 
 I have use the Brimar CV 4033 in the 12 at7 input  spot and enjoy the sound, so was wondering about it as a driver ?
4. What tube is more impact on the sound , input or driver ?
5. Ideas for rolling  the 6414 as i do not see many around ?

Thank you. Mike
128x128jazzman463

Showing 1 response by mijostyn

mijostyn's avatar
mijostyn
8,234 posts
 
Jazzman, I always follow the manufacturer's suggestion. I just try to find the lowest noise version of the type. RAM Labs tests their tubes for noise and put the speck right on the box.
Any labels on the tube should be removed. I always turn the unit off before I remove tubes even if they are not that hot. You do not want any impulses getting to other equipment. If the unit is disconnected it is off anyway. 
If you really want advise from the hourse's mouth call Manley and ask.
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