Alsgro

UREI LA-5 Mods?
« on: May 27, 2018, 10:03:33 PM »
I have an old UREI LA-5 that’s already been modded many years ago to have the LA-4 ratio selector added.  My question is: does anyone know of any worthwhile mods to make this behave/Sound more like an LA-3A?? 

Are they worlds apart design / component-wise?



scott2000

Re: UREI LA-5 Mods?
« Reply #1 on: May 27, 2018, 10:17:10 PM »
I have an old UREI LA-5 that’s already been modded many years ago to have the LA-4 ratio selector added.  My question is: does anyone know of any worthwhile mods to make this behave/Sound more like an LA-3A?? 

Are they worlds apart design / component-wise?

Have a look

http://www225.pair.com/audio/waltzingbear/Schematics/Urei/LA_3A.htm
"Give me a 25-stack of 9V batts, I'll monitor my truck's spark or fuel injection on the magic eye." PRR

abbey road d enfer

Re: UREI LA-5 Mods?
« Reply #2 on: May 28, 2018, 04:47:21 AM »
I have an old UREI LA-5 that’s already been modded many years ago to have the LA-4 ratio selector added.  My question is: does anyone know of any worthwhile mods to make this behave/Sound more like an LA-3A?? 

Are they worlds apart design / component-wise?
Apart from the discrete/IC difference, which is not significant as long as the design brief is similar, the huge difference is the LA3 uses the T4 element, when the LA5 uses an LED-based optoresistor. That is a big difference since the T4 has quirky response time, which makes it particularly loved by some and hated by others.
The T4 is a high voltage device; modding an LA5 for this in an extensive job.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
"The important thing is not to convince, but to give pause for thought." (B. Werber)
Star ground is for electricians.

Alsgro

Re: UREI LA-5 Mods?
« Reply #3 on: May 28, 2018, 05:06:50 PM »
I appreciate all the input!  Thanks, all.  I may sell the unit to finance another build. ;)


 

Related Topics

  Subject / Started by Replies Last post
4 Replies
1803 Views
Last post February 23, 2005, 09:05:35 PM
by NewYorkDave
3 Replies
1469 Views
Last post October 13, 2006, 06:58:58 PM
by usekgb
9 Replies
2689 Views
Last post October 20, 2005, 10:58:27 AM
by nrgrecording
20 Replies
13177 Views
Last post August 08, 2009, 03:55:17 PM
by SNG