Op-Amps
Op-Amps
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OP Amps OPA627BP and AD797An display

Discover the Secret 
For Unlocking the Maximum Potential From Your Firestone Audio Components

Easy To Install Op-Amp Upgrades  

Every month we receive many inquiries regarding the interchangeable Op-Amps found in the Firestone Audio Components. But if you've every tried to find just the "right one" among the hundreds available you realize its a very daunting task.

So to help make this Op-Amp stuff a lot more fun, we've gone ahead and put together some of the finest Opamp choices for tweaking the tone in your Firestone components. These Op-Amps are universally regarded as the finest sounding available.

So what is an Op-Amp?

Op-Amp is short for Operational Amplifier. In simplistic terms, it's the magic little IC chip inside most of the Firestone components. Its job is to boost the weak input signal to a much stronger signal and ensure this more powerful signal remains an exact copy of the original. It's kind of the Solid State counterpart to the Power Tube in a Tube Amp.

In many of the Firestone components the Op-Amps are changeable, so its something you can swap out to tune and tweak the sound of your component.

Single Channel Op-Amps vs. Dual Channel Op-Amps

All Firestone components use a dual channel Op-Amp to achieve stereo output. Some of the Op-Amps offered on this page are single channel Op-Amps. This means you'll need to use two single channel Op-Amps for stereo output. This requires an dual to mono adapter. Enter the OPA104 Adapter.

The OPA104 adaptor allows a pair of single channel Op-Amps to fit where one, dual channel unit existed before.

                                 Dual Mono to Single Stereo Op Amp Adapters           
                         The OPA104 adapter accepts two single channel Op-Amps and  plugs directly into the original socket.

 

Ordering Information

Before placing your order please check the compatibilty chart below.

If you see "NO" in the column then the OPA104 Adapter will not fit that application.
You'll need to order the OPA2627 SuperChip instead. The SuperChip fits every component.
If you see "YES" then the OPA104 Adapter will fit and you have the option of trying the 627 or the 797 Op-Amps.
 Part Number   Description  Price
 OPA104   Adapter ONLY $9.00
 OPA627AP   OP-Amps ONLY (Set of 2) $42.00
 AD797AN   OP-Amps ONLY (Set of 2) $42.00
 OPA2627 SuperChip     Includes 2 - OPA627 Op-Amps on a compact PCB       $37.00
 LM4562    OpAmp (dual channel) $11.70

 


 

 

 


Every Op-Amp is tested in an actual Firestone Audio circuit prior to shipment. You're guaranteed to receive a perfect part.

 

Op-Amps Compatibility Chart

Firestone Audio Component

Original
Opamp

Socket  ID
(Printed on PCB)

OPA2627
SuperChip

OPA104 Adapter

Little Country III

OPA2604

U1

Yes

NO

Tube Head Pre Amp

OPA2604

U1

Yes

NO

Fubar III 2009 Model (Headphone amp module)

OPA2604

U1

Yes

NO

Fubar III DAC module (Dog Logo face plate)

OPA2604

U7

Yes

NO

Fubar III Headphone module (Dog Logo FP)

OPA2227

U2

Yes

Yes

Spitfire DAC (Dragon Face plate model)

OPA2604

U7

Yes

Yes

Big Joe V1.3 Power Amp

OPA2604

U2

Yes

Yes

Cute Beyond

OPA2227

U2

Yes

Yes

Fubar II ("Dog logo" face plate only)

OPA2604

U5

Yes

Yes

Cute II Battery

OPA2227

U1

Yes

Yes



OPA104 Adapter

Many of the best sounding Op-Amps are only available in single channel versions. This clever adapter allows you to use two single channel Op-Amps in a dual channel socket.


$9.00 each    Quantity  

 


OPA627AP by Burr Brown

The “627” is thought by many to be the ultimate Op-Amp and continues to set the standard by which all others are compared.

OPA627 Characteristics

  • Ultra wide sound stage
  • Smooth,  Natural Sound
  • Fast detailed transients, very musical
  • OPA627 Spec Sheet

 


$42.00 (Set of 2)    Quantity  

 

 

AD797AN by Analog Devices

The AD797AN is a very low noise, low distortion Op-Amp. The "797" rivals the OPA627 for top spot and in some systems comes out the winner.

If your system tends to be a little dark sounding this is the one to try. 

AD797 Characteristics 

  • Open, lively and transparent
  • Fast and accurate with deep musical detail
  • Ultra wide dynamic range of -120db at Audio Frequencies
  • AD797 Spec Sheet


$42.00 (Set of 2)    Quantity  

 

OPA2627 SuperChip

In some components there is not enough room to use the OPA104 adapter. (See compatibility chart)

For these applications we developed the OPA2627 SuperChip.

  • The OPA2627 SuperChip features two OPA627's on a single PCB
  • Works with every Firestone component with an interchangeable Op-Amp
  • Simple 5 minute install,
  • Fully tested in an actual Firestone Audio Circuit
The same high end "627 Sound", carefully combined on a compact PCB

$37.00 each    Quantity 

 

 

LM4562 OpAmpLM4562  by National Semiconductor

This is the new darling of the OpAmp world, especially for DACs. Firestone Audio is now installing the LM4562 in the DAC section of all Fubars and the 2009 Spitfire.

Superb sound at a excellent price. A worthwhile upgrade for all Fubars and Spitfires with a exchangeable OpAmp.

 LM4562 Characteristics

  • Ultra low distortion, low noise, high speed
  • High Fidelity, High Performance Audio
  • Dual OpAmp, one required for Firestone Audio components
  • Recommended for Fubars and Spitfire
  • A popular choice with Audiophiles and Professional modifiers
  • LM4562 Spec Sheet
  • LM4562 Press Release

$11.70 Each    Quantity  

 

 

 


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