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API 2520

What can you tell me about the API 2520?

  • What made it famous or sot after?
  • Did API actually design it?
  • This is reissued in this Pulse EQP 1A3. Are they making it? The spec sheets attached have a date of 1981.

I can't just demo one here either. Any history on it would be a fun read at least.

Is this it on the back of this EQP 1A3

Classic PULTEC PASSIVE EQS with API 2520 makeup gain stage

Particularity on the Pulse Techniques EQP 1A3 . Not interested in other clones.
I'm addicted to Pultec's this month and want to know how sweet the high end is on the SS compared to the tube version?

I know you are looking for opinions on these or have some if you are here.