I'm would like to build a bass valve amp for me, to use with the P-Bass. But the question is... what kind of components should I use? What are the best valves, circuit, configuration, etc? I'm plannin to use a PTP (Point to point) circuit but don't know exactly what valves i should use. A friend build an amp with a Giannini Bulldog Bass (Brazillian '70s mark, wich used to copy Fender, Gibson, Marshall, Rickenbacker, etc...) circuit with 6550 valves, and it sound is very good!! Anyway, I want a bass amp the sounds like John Paul Jones, Jack Bruce, Mel Schacher... Play also some Jethro Tull, Ten Years After.. Damn... I want a sound of 60s-70s rock and roll bands. Any suggestions??