DIY Class A/B Amp The "Wolverine" build thread

[Mainframe]

What about 2sa1859A/sc4883A? Would these manage to drive 5 pairs at 71V or not?
I use these to drive 3 pairs at 71V and 4 pairs at 64V. I'm just finishing these two builds, all is ready for powering up. Should I proceed?

Like I said, obsolete dance 😎 Those are good if you have 'em, use 'em

 

[asuslover]

The 2 transistors Q101/Q102 used for the capacitor multipliers, if I use 3503D and 1381E, will the hfe difference have a big impact?

 

[danieljw]

I used them recently and they worked well for me

 

[RodimusPrime98]

Does anyone have a solution for how to mount two toroidal transformers for a dual mono setup?

 

[Paul_Thorpe]

This set up worked well for me.

 

[danieljw]

The 2 transistors Q101/Q102 used for the capacitor multipliers, if I use 3503D and 1381E, will the hfe difference have a big impact?

Further to this for higher V rail options use the 3503D/1281E and choose higher gain parts.

For lower rail options use the TTA004B/TTA004C since they typically have higher gain than the 3503D/1281E

Check out the line in the BOM related to this also.

Hope this helps

- Dan

 

[Mainframe]

The 2 transistors Q101/Q102 used for the capacitor multipliers, if I use 3503D and 1381E, will the hfe difference have a big impact?

Nope, you're fine. We looked into this recently.
Both TTC/TTA004 and (XXX)3503X/1381X parts work in the cap multi position for all rail configurations.
TTC/TTA004 are preferred due to typically having ~200 hFE vs the ~90-130 of the 3503/1381.
That said, either work fine and there'd be miniscule difference.

It's the predrivers and VAS where rail voltage becomes a real concern.