Re: Oberheim/Gibson?

[Sean Echevarria <sean.loop@creepingfog.com>]

Bingo!  There are manufacturing differences between the beige and 
black units (aside from software version).

This page http://www.loopers-delight.com/tools/echoplex/LoopIII_v5.html 
writes:
Power supply variations on some units could cause slightly low 
readings for Feedback, causing problems where the loop would decay 
even with the know all the way up. Units had to be tested for this 
problem in production and fixed before they could ship, which was 
inefficient. Some units undoubtedly shipped with such a problem, and 
there is the possibility of developing it as the hardware ages. 
Changes have been made in software to tolerate worst case voltage 
variations across all the relevant circuits. This corrects the 
problem, with the tradeoff being a slight reduction in feedback 
resolution at the top end of the scale. It doesn't appear to be 
noticeable, and is definitely worth it for the improvement in reliability.


More notes here:
http://www.loopers-delight.com/tools/echoplex/FAQ6.html#Anchor-47383

http://www.loopers-delight.com/tools/echoplex/FAQ6.html#Anchor-17304



At 2007.12.13 07:32 AM, Travis Hartnett wrote:
>My two main EDP's are one of the old Oberheims and a recent blackface
>Gibson.  I also had my Oberheim sent to British Audio to get the LCD
>replaced (burnt out element from the factory) and they updated a few
>things at the time--cooler power supply, something on the Mix control,
>and one or two other things that I can't recall.
>
>The thing to look out for when purchasing a beige unit used is the
>software version, as it's about $125 to get the new version.