HD 500 Tube Question!

[x K E I T H x]

I was wondering if anyone knows what tube is in the HD 500 Bass Head? And also what can it be replaced with?
Thanks Keith

 

[Rod Trussbroken]

I'd give EB Service Dept a call.

Also, here's a link to the MM Amp discussion forum:

http://65.173.181.17/cgi-bin/discus/discus.cgi?pg=topics

 

[x K E I T H x]

Thanks