Upgrade Pro-Ject Head Box op-amp

[Guido_59]

Hello guys I'm Guido from Italy .
This is a great forum.
I have a question about an upgrade of my headphone amp Pro-Ject Head Box II to improve frequency response, sound, ecc...
The biggest trouble is substitution of op-amp that is an JRC2068 : what is the best choice op-amp for substitution ?
NE5534 , OPA1641 , OPA 2134 , LME 49723 , or other ? For the Manufacter ? Texas Instr, National , Burr Brown , Analog Devices or others ? Is it advisable colling these op-amp ?
Do you think the new op-amp upgrade increase the temperature of other components , example in alim section in voltage regulator ?
For other components like capacitors I see Elna or Panasonic FM Caps and maybe I make an upgrade also of ext alim 16 V with other with more power ?
Can you give me some suggests ?
Thanks
Guido

 

[BinaryMike]

Suggest you post the Pro-Ject schematic. Some of the folks who could help, such as myself, are not familiar with every model on the market.

 

[Guido_59]

Thanks BinaryMike but unfortunately I haven't it
I have't found any Pro-Ject schematic.I try to looking for it on web at this moment I only have this internal picture if it can help you to understand.
Bye
Guido