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In Reply to: RE: 26 preamps..... posted by andy evans on April 01, 2014 at 02:57:35
Thinking ahead to another project. How is the sound of the 4P tube as compared to the 26 tube? I wanted you to build me one but I guess life got in the way. So be it! Now that I found a builder here in the states that I am very pleased with(and will know more once I get it here)I might, after a little while ask him if he's interested in doing another project.
Follow Ups:
Hi there - indeed, life got in the way - I've been busy.
Anyway, the 4P1L is microphonic. No getting away from that. So you should warn whoever's building your project that they need to take special measures. In no particular order:
- starve the filements. I use them in parallel at 1.9v
- don't even think of using a chassis that isn't massive and sonically dead. I'm talking 4mm aluminium here. Anything less and you're asking for trouble.
- reckon on feeding the 4P1L with a 2v signal. Less than a volt and you're in trouble.
- wrap plumbers tape several times round the bottle and fasten with electrical tape.
- consider some kind of rubber decoupling of the sockets (but bolt the sockets to something solid before decoupling it). I actually haven't needed this.
Read up on all the DIY Audio threads about the 4P1L, Especially the line stage thread.
Good luck! The 4P1L is a real performer.
Is that a typo?
Seems like a lot to drive a line stage.
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