Building a variation of Zenlite- have a question

nobody special · 6th April 2006, 04:45 PM

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.

Nelson Pass · 6th April 2006, 08:40 PM

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.

nobody special · 7th April 2006, 01:15 PM

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.

Nelson Pass · 10th April 2006, 09:02 PM

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.

6th April 2006, 04:45 PM	#1
nobody special diyAudio Member Join Date: Oct 2002 Location: USA	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. __________________ Steve

7th April 2006, 01:15 PM	#3
nobody special diyAudio Member Join Date: Oct 2002 Location: USA	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. __________________ Steve

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ZENLITE from MalaySIA	commstech	Pass Labs	9	18th March 2005 04:19 AM
Perfect speaker for SOZ or ZenLite	Tyimo	Pass Labs	9	4th February 2005 06:35 PM
Power Supply for zenlite	Rodeodave	Power Supplies	0	27th December 2004 03:22 AM
Completed Huge Zenlite	BTW	Pass Labs	10	8th October 2004 05:08 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

6th April 2006, 08:40 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	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.

10th April 2006, 09:02 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	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.