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.
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.
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.
seem to be a problem - of course I didn't mount the bulbs
on the speaker enclosure.
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.
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.
a quitar amp would be getting tossed off the back of the van.
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