I took the original tube out of my Mo'Bass and put in the Preferred Series 7025 Audio Tube and never looked back. I'd give it a try it has good reviews. 
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What pre amp tube for SWR?
- Thread starter Nephilymbass
- Start date
I would say the issue isn't with the tube. It's likely an old capacitor issue. Many of these SWRs are getting old now and with the way they were designed with their chassis being part of their heat sink, many of the caps could have very well drifted out of spec.
If you don't know a cheap tech you'd probably be happier with a different amp.
If you don't know a cheap tech you'd probably be happier with a different amp.
