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Old 6th June 2011, 04:37 AM   #1
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Default 5691 tube tonal balance

Hello tube gurus.

In my experience, RCA 5691 tube has a very specific tonal balance - very full-bodied, with somewhat rolled-off high frequencies. This is exactly what I'm looking for for now. But, they are so expensive, that I have to look elsewhere. Question is, are there any regular 6SL7 tubes out there with similar tonal balance? I have tried JAN Philips, GE silver plates, even Russian ones, and all are a lot thinner and brighter sounding. Are there other 5691 alternatives with similar darker sound?

Thank you
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Old 6th June 2011, 10:23 AM   #2
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How expensive are they? I have a pile of them.

Try a 6SU7.
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Old 6th June 2011, 01:08 PM   #3
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Default 5691

Ooops! I should have said "they are worth nothing"! and get a bunch from you! Seriously, you can look on line and Ebay and see what they go for. I've seen them go anywhere from $26 (used) to $80 (claimed NOS).

Want to sell me a few?

I have never tried 6SU7...

Thanks
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Old 6th June 2011, 01:15 PM   #4
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6SU7 is a drop in replacement for 6SL7- should be pretty easy to find. The original raison d'etre was section-to-section match.
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And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
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Old 7th June 2011, 01:28 AM   #5
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Default 6SU7

Found some. Same prices as 5691. People know what they want!
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