Comes with KIA 4559P op-amps, TNC caps, Tracon caps, EFC caps or equivalent
Later models/revision came with 4pcs of AD op275 op-amps to replace some KIA op-amps
Comes with BB opa2604ap, Wima caps, Sanyo Oscon caps
Customized Upgraded Pre-Amp Card offered by Audio Creations (for sale)
BB - Burr-Brown AD - Analog Devices 
We use top-of-the-line BB opa627 mono op-amps and the highest possible grade of capacitors (that can fit) which includes Blackgates, Mundorf etc.
A total of 12 BB opa627 is used on this 4ch Billet pre-amp card upgrade
Another high-end favorite is to use AD797 op-amps
Upgrades:
1]BlackGates NX,NX-HiQ,C,PK capacitors
2]Burr Brown OPA627AP
3]4% Silver Solder (optional Mundorf Silver/Gold Solder)
Listening Impression:
Words alone cannot describe the significance of this upgrade. A listening session would be more appropriate, so it is best that an appointment is made with us to experience it first hand. Alright to be fair, here is a preview of what it improves: a) palpability & presence b) greatly reduced noise floor c) higher levels of transparency d) separation and detail e) control f) did I say control? g) better come and listen...
*NEW - pictures of 12 pcs of AD797 on a 4ch Billet pre-amp card. Congratulations to the owner:
200WRMS X 2 @ 4 ohm
Power capacitors upgraded to Blackgates
Yes, we know.. they are huge
Note: The amplifier comes with a fully upgraded 2ch pre-amp card with BB opa627 and full blackgates capacitors
