I have a couple of CJ preamps and have bought tubes from them before.
Minuses: You will pay more for the tubes.
Pluses: You will be getting an "A" level tube. They have been tested in their circuits (not a tube tester) and they go thru a controlled burn in (on/off cycles) that they say will give them a longer life.
Worth it? Your call.
How to? If the unit is cold then just wiggle the old ones out gently. If the unit was on, let it sit for 20 minutes before pulling them so the caps can drain and so you won't burn your fingers. When you insert the new ones, line up the pins carefully, you shouldn't have to force them in.
Minuses: You will pay more for the tubes.
Pluses: You will be getting an "A" level tube. They have been tested in their circuits (not a tube tester) and they go thru a controlled burn in (on/off cycles) that they say will give them a longer life.
Worth it? Your call.
How to? If the unit is cold then just wiggle the old ones out gently. If the unit was on, let it sit for 20 minutes before pulling them so the caps can drain and so you won't burn your fingers. When you insert the new ones, line up the pins carefully, you shouldn't have to force them in.