Tubes
If you have a no name 12AX7 get rid of it immediately - any replacement is good but a 5751 is the best replacement.
If you have the Electro Harmonix 6V6 keep it but a Brimar 6V6 from Watford Valves is a good improvement. If its no name replace it.
The speaker needs wearing in big time. You can get a Jensen Chicago 6" speaker at TAD
http://www.tubeampdoctor.com/index.php?cPath=37_39_66
i definitely agree on the 5751! makes it sound a lot better imo!
thanks for the link, i'll check that out as a speaker replacement
oh and, i think ill build a 210 cab for mine :D