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API 2510 and 2520
Old 5th November 2011
Gear Head

Thread Starter
API 2510 and 2520

I am a newbie here...

Can any one tell me about the differences between the 2510 and 2520 op amps, their typical functions, and what either are doing sonically or in more layman's terms. How do they work together, what are they doing on their own?

My basic understanding and lack there of is the following:

The 2510 (Was created by Paul Wolff)
-is a balanced transformerless op amp.
-It comes first in the signal flow, and acts as a "buffer?"
-Is not found in API mic pre's/DI's.
-Is found following the line level input on API compressors, eq's, line mixers, and summing sections.
-There are however no 2510's on the buss and send returns? (Why?)

The 2520
-"Happiness is a warm transformer?"
-In a mix setting, is this what is imparting a responsive "sound" (or saturation) at varying levels? Does the 2510 contribute to this?
-On API consols the prgm fader is between a 2510 and 2520.
-There is a 2510 which seemingly sums all line inputs before the 2520 ACA.

Many Thanks!
Old 17th November 2011
Gear Head

Thread Starter
Old 18th November 2011
Lives for gear
nosebleedaudio's Avatar

Basicly the 2510 is a Line driver with minimum components and less gain than the 2520, the 2520 will also drive a low impedance output but more gain available and is an Op Amp, don't believe the 2510 is an Op Amp in the full sense..
Old 18th November 2011
Gear Head

Thread Starter
Many thanks Mike!
Old 28th January 2015
Gear Maniac

More infos?
Old 28th January 2015
Lives for gear
Kronos147's Avatar
Originally Posted by metaphonic View Post
The 2520
-"Happiness is a warm transformer?"
This is an old thread, I know, but the 2520 op amp is separate from any transformer. I just wanted to straiten that out.
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