Tube replacement

[GonzoBfiddy]

Fellow TBers, can anyone advise me on replacing the pre-amp tube in an SWR 750X? Is it a "do-it-yourself" situation or must I have it serviced professionally?
I purchased the amp new in 2006 and have only just recently noticed a change in tone. I have replaced the pre-amp tube in my Super Redhead several times myself but am not sure if this amp (the 750X) is as easily accessible. Does anyone have experience with this? Any suggestions would be helpful and very appreciated.
Thanks.
Gonzo

[96tbird]

Get a new tube. Remove the old tube. Put some DeOxit on the pins of the new tube (optional but good practice). Plug the new tube in. Turn power on.

Pre amp tubes can be swapped at your whim.