Let's have some fun, and end up with a fine tube amp that you can't buy off the shelf. Here's the scenario... I've got an old guitar amp chassis for a donor, an Acoustic model 164 100 watt tube amp. It has nice hefty output and power transformers, and is set up for 4 6L6 output tubes at around 100 watts output. I'm going to gut it and build a bass head out of it, using turret board construction. Thinking of running 4 6550 tubes for the output section, but if I do I'd have to add a separate filament transformer. So let's think primarily 6L6 or EL34 output tubes. If you could marry the preamp from one amp and the output section from another, which would you choose? I'm thinking about an SVT preamp and a 100 watt Fender output stage. Not the ultralinear, the Bassman 100 that's like the old blackface Bassman upgraded to 100 watts output.I'm pretty old school and love the simple designs that rely on good design and bring out the best that a tube can deliver. Like the 5E3 Fender tweed clone I built a few years ago. Simple circuit with 2 volumes and one tone control...sounds like heaven into a Celestion Blue. Soooo, what do you think? Help decide what to build and I'll post photos and updates as the project goes forward. I play a jazz bass in a blues band, and also do a lot of praise and worship work at church. I currently have an Acoustic 600b head and a couple of matching 4x10 cabs and want to make the jump to tubes. As a retired engineer and 40+ year guitar/bassist I love tube amps. All my guitar amps are tube, but I just began playing bass a few years back and this solid state Acoustic was my first bass rig. But I played a good tube head the other day and now I can't go back...so let's have some fun!