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Twenty 5 Twenty SMD Opamp

Twenty 5 Twenty SMD Opamp
  • Click to enlarge
  • Click to enlarge

$49.50AUD inc GST for Australian Customers
(Approx $32.80USD outside Australia)

(Quantity discounts available)

Product Information
Quantity Discounts
Stock Level144

Twenty 5 Twenty SMD opamp is an amazing sounding extreme precision version of the old original 2520 opamp. 

  • Voltage range of +/-12v to +/-25v.
  • Precision 1% matched input transistor diff pair
  • Precision 1% matched second stage transistor diff pair.
  • Improved thermal layout for least DC offset on output.
  • Improved output transistor thermal bias current control.
  • Opamp is open unpotted design for servicing and repairs.
  • Now Gold PCB.

We test the Twenty 5 Twenty at +/-25v into a 50ohm load at extreme overload.

Works perfectly on our BA BAD BAN PCB's or any 2520 type mic pre, EQ & Comps including 2500 comp. 


Test results for TWENTY 5 TWENTY against vintage API 2520 in BA kit

Frequency response (from 40 Hz to 15 kHz), dB:+0.10, -0.56+0.10, -0.56
Noise level, dB (A):-108.6-108.9
Dynamic range, dB (A):108.5108.8
THD, %:0.00210.0019
IMD + Noise, %:0.0220.021
DC offset at opamp output pin+/-25mV+/-1mV
Min to Max +/-power rails+/-12v to +/-20v+/-12v to +/-25v


Frequency response in BA kit

Spectrum graph


Noise level in BA kit @ 10dB of gain

Spectrum graph

Basically noise floor of computer testing setup except for 50Hz peak due to open BA PCB kit on bench with no case.

You can save money on this item when you purchase several at a time. The table below shows the minimum quantities required to benefit from this offer, and how much they'll cost.

QuantityPrice per unit

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