Discover the Secret
 For Unlocking the Maximum Potential From Your Firestone Audio Components.
  Easy To Install Opamp Upgrades  

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

Single Channel Opamps vs. Dual Channel Opamps

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

The OPA104 adaptor lets you use a pair of single channel Opamps in a socket designed for one dual channel opamp.

                                            
                         The OPA104 adapter accepts two single channel Opamps and  plugs directly into the original socket.

Ordering Information
opamps

OPA104 Adapter

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

OPA627AP by Burr Brown

OPA627 Characteristics

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

AD797AN by Analog Devices

The AD797AN is a very low noise, low distortion Opamp. 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

627 SuperChipTM

In some components there is not enough room to use the OPA104 adapter and a pair of single channel Opamps. (See compatibility chart)  For these applications we developed the OPA627 SuperChip.

• The OPA627 SuperChip features two genuine OPA627's on a single PCB
• Works in every Firestone component with an interchangeable Opamp
• Simple 5 minute install,
  
• Fully tested in an actual Firestone Audio Circuit
  
  

New!

Superb "797" sound, carefully combined on a compact PCB

In some components there is not enough room to use the OPA104 adapter and two single channel Opamps (See compatibility chart). For these applications we developed the AD797 SuperChip.

• The SuperChip features two Genuine AD797s on a single miniature circuit board
• Compatible with all Firestone components with a changeable Opamp
• Simple 5 minute install
• Fully tested in an actual Firestone Audio circuit

The AD797 is a very low noise, low distortion Opamp. The "797" rivals the OPA627 for top spot and in some systems comes out the winner. If your systems 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
  
  

LM4562  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 Spitfire MkII

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 Channel 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

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