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Old 6th April 2006, 05:45 PM   #1
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Default Building a variation of Zenlite- have a question

I am building a balanced version of the zenlite with asymmetric (15V, 40V) rails, a front end differential pair, and X feedback. Basically an Aleph X with lightbulbs instead of the Aleph current sources.
My question is about the susceptibility of the lightbulbs to noise. I'm trying to keep my enclosure to a minimum size, and it's looking like I will have to either make it deeper or the toroid I'm using will be partially sitting under one of the lighbulb sockets (with 1/2" vertically and off center from the transformer). Do you think this will be a problem, as far as inducing noise into the circuit? I'm thinking yes, because of the feedback.
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Old 6th April 2006, 09:40 PM   #2
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There is a small microphonic to the light bulbs, but it didn't
seem to be a problem - of course I didn't mount the bulbs
on the speaker enclosure.
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Old 7th April 2006, 02:15 PM   #3
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I'm sorry... I should have been more specific. I meant electrical noise, as in induced 60Hz from the Toroid magnetic field. But it is good to know about the microphonics. I was also thinking about building a guitar amp with a bulb in it, so that might be a real issue for that application.
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Old 10th April 2006, 10:02 PM   #4
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No issue with electrical noise, and I think the only issue with
a quitar amp would be getting tossed off the back of the van.
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