Question for Dave on PI tube in BE-100 (balanced or not)?

  • Thread starter Thread starter Jayy
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Jayy

Jayy

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I wanted to hopefully hear (straight from the horses mouth, so to speak) on whether or not the PI tube specifically in the BE-100 should be balanced or of it doesn't matter at all. I posted this here instead of emailing Dave so maybe others could learn from it too.

I have read so much conflicting stuff on the PI tube balanced vs. unbalanced that I don't know what the hell to believe (this tends to happen when I try to educate myself on something :doh: ). I am guessing (maybe incorrectly) that in the BE-100 and other similar AB amps the entire power section following the PI tube really isn't totally balanced anyway, so maybe a balanced PI tube helps maintain that imbalance??? I don't know. What do you say, Dave? Does it matter in the BE-100? Does it EVER matter in ANY amp?

Also, I want to take the opportunity to thank Dave publicly for both designing and building an amp I absolutely LOVE, and also for great service on an issue I had and tolerating my questions and emails as I learned more about the amp. Thank you Dave!
 
Not really needed no. Everything is unbalanced really. It's not a bad idea to know the PI tube has similar gain on both sides of the tube though. So it wouldn't hurt to have a tested tube there.
 
RACKSYSTEMS":vlnlaqqt said:
Not really needed no. Everything is unbalanced really. It's not a bad idea to know the PI tube has similar gain on both sides of the tube though. So it wouldn't hurt to have a tested tube there.
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Thank you Dave. Good to know. I'll go for tested tubes that have tested as being relatively equal on each side of the tube for the PI then.
 
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