Ba3 for F6

[acowans]

Just finished the F6 and though I have an updated McCormack pre amp to use temporarily I'm eying making a pre-amp. Am I right that the BA3 seems to be a great match for the F6 and that it puts out enough signal to adequately drive it ?

If so, is there an updated BOM somewhere here that can be a starting point for me ?

I'd want to build the active version.

thank u !

 

[vdi_nenna]

I think the BA3-Pre works fine with the F6 and I can use it will all my power amps, even F4 power follower.

If new to DIY audio, you should always start with the Build Guides by 6L6.
The diyAudio build guides

You can find the boards in the store and will include bill of materials.
Burning Amplifier Gain Stage for BA-3 – diyAudio Store

 

[ColinA123]

Here is the circuit (modified to stop oscillation) and BOM.
First task is sourcing the JFets and Mosfets. Genuine sellers still available if you search around on here.


BA3 works very well with my F6 (I could say perfect match)

 

[acowans]

ba3 BOM

Thanks ! And to clarify, the parts list is for ONE channel only, so double all part quantities?

Also did you end up preferring the revised JFETS set up and their required matching parts ?

I assume I still have to build a PSU like the on used in the F6 or a smaller/simpler one ?

 

[ColinA123]

Building tip No 1---
Put the Mosfets in the correct places! (don't ask how I know) 😱

 

[ColinA123]

Yes one channel, so double up.
You need a power supply, so small (30 - 50 va) transformer and rectification stage.
I wanted a regulated supply, so being lazy boy I used this which works fine.
Many others out there.
Class a Parallel Adjustable Regulated Power Supply DIY Kits Output +-5v- +-20v for sale | eBay

 

[6L6]

I really like this regulated PSU from TubeCad - Dual/Bipolar LV-Reg

 

[acowans]

dual / bi polar power supply board and components

Thanks, this looks interesting; will ping them about it