#1
ok, i have a 70's fender bassman tube head. recently after i play for a little (like 15-20 minutes) the volume drops to about half and it sounds like ****. kind of like insanely heavy distortion. anyway, i pulled out the tubes and put them back in but i realized they were a little loose. so i tightend them up and put them back in but i havent had a chance to play yet. do you think that will fix the problem or do i need new tubes?
Method of Groove




"Hardcore without punk isn't music, it's a genre of porn.
Punk isn't a genre of music, it’s a thought process."
#2
Tubes are funny... you have to replace ALL of them at the same time, and they need to be matched.

I go with Groove Tubes for my Ampeg SVT when that is needed.
Avast Ye Scurvy Scalawags!

Pirate Gear:

Charvel/Jackson 3B Bass
Series 10 5-String Bass
Vintage 70s Ampeg SVT/SVT 8x10 Cab
Ibanez GSA 60 Guitar
Roland Cube 15 Amp
Yamaha DD-55 Drum Machine
TASCAM 424 Portastudio
#3
Quote by alm0st a skat3r
ok, i have a 70's fender bassman tube head. recently after i play for a little (like 15-20 minutes) the volume drops to about half and it sounds like ****. kind of like insanely heavy distortion. anyway, i pulled out the tubes and put them back in but i realized they were a little loose. so i tightend them up and put them back in but i havent had a chance to play yet. do you think that will fix the problem or do i need new tubes?

The Bassman is a great amp but the problem is that it is getting old; I recently restored a 70s Fender Dual Showman 15 to 20 capacitors had to be replaced as well as most of the pots and quite a few resistors (not foregetting all of the valves/tubes).
G&L L2500
Squier Affinity Jazz Bass 5
Ashdown RPM pre-amp
Ashdown Little Giant 1000
300 watt 15" powered cab
450 watt 15" powered sub bass cab
2x10 + horn
1x15x10 + horn
#4
sounds like u need new tubes in the power department. Due to the amps age it could be worse though.