How many times are you going to ask this question ?
As one member suggested, why not just buy some cheap tubes and place those in the phono stage section of the preamp and keep the other ones for spares.
http://thetubestore.com/chinese12ax7.html
http://thetubestore.com/tesla12ax7.html
For under $20 your problem would be solved.
As one member suggested, why not just buy some cheap tubes and place those in the phono stage section of the preamp and keep the other ones for spares.
http://thetubestore.com/chinese12ax7.html
http://thetubestore.com/tesla12ax7.html
For under $20 your problem would be solved.