Foreplay 3 b+ voltage question

[balancedtriode]

I am wondering how High a Voltage the B+ voltage was in the preamp my friend has one and I kinda have a modding Idea
any info would be appreciated
thanks,
coltrane

 

[Paul Birkeland]

The stock Foreplay III and the Extended Foreplay III use very different power supplies, so knowing which you are starting with will be helpful.

The stock Foreplay III makes right around 400v before the 0D3 regulator circuit.

The Extended Foreplay III makes about half that before the 12AU7 hybrid regulator.

 

[balancedtriode]

after the 0D3 Regulation circuit whats the b+ voltage?

 

[Doc B]

The 0D3 is a 150V regulator.