Re-biasing a CJ Premier 8


I am considering to get a used CJ Premier 8 amp, current tubes are 75%-50% of their life (12 6550 per side) and dealer recommends me to re-tube both units.

1.- Which are the best options considering a high price/performance ratio?

2.- Any word on domestic Svetlanas vs fying "c" options?

3.- What about trying KT90´s?

Thanks for your feedback.

Fernando
128x128flg2001
CJ quote came from the company itself (they have been very supportive, kind and informative), again - it would be around 600 US per amp.

The Svet 6550c quote comes from www.sovetk.com, under Svetlana section, my friend has dealer pricing and kindly passing thru.

I am NOT including the driver set, which look OK.

I need to take a decision in the next 48 hours or so (flying to Detroit on Sunday from Mexico) - I have the feeling that I will run the "risk" of re-tubing and keep the Premiers 8 for me.

Fernando
Believe me the drive tubes matter, more than you think.When you finally get around to getting some cryoed ones;you'll understand.
I would concurr with avguygeorge on the influence of the input and driver tubes. That said: Both the 6fq7's and the 5751's in the amplifiers should give you at least 3000 hours of life before replacement [unless they go noisey or microphonic]. The nos triple mica sylvania 5751's as well as the rca triple mica black plates can have a profound impact on the resolution and bass drive in the CJ amplifiers.
Do you still own these amps? I am breaking in these amps which I just purchased with new tubes from CJ. I am not very happy yet with the sound as they need to break in! What pre amp and speakers have you chosen with these monos?