B+ current

PRR said:

> tell me the B+ current requirement of the "Therapy" mic pre?

Who remembers all details of all project??

How about a link?
https://groupdiy.com/index.php?topic=38252.0
https://groupdiy.com/index.php?action=dlattach;topic=38252.0;attach=3176;image

The 3rd stage current is right on the plan. 15mA.

The 1st and 2nd stages--- when in doubt, assume a resistor-loaded stage sits with plate at "about half" of supply voltage. Which means plate resistor has the other half. Ask Mr Ohm.

1st: 85V/47K= 2mA
2nd: 90V/15K= 6mA
2mA+6mA+15mA= 23mA per channel.

Double for 2-channel-- 50mA.

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