Preamp: Foreplay or 5687 or 12B4

[zobsky]

To make it short, in your opinion will the power supply in post #14 work well with your 12B4 linestage? By working well, I mean good sound, not necessarily as good as your new PSU designs. But something that I can learn on and expand on in the future.

Thanks again for your time,
Toyman

I'm no Frank, .. but if you want a one word answer, ..it's probably YES, ..IMHO (and may the god of lightening smite me down tonight if I'm wrong 🙂 )

.. if you want a barebones silent PSU, .. one choke should do the trick (as per my novice work with PSUD on this design)

 

[fdegrove]

Hi,

I tried my own on post #14 by taking an existing 250V and trying chokes with diff resistance ratings to get to ~260V.

First of all, I don't think 10VDC less will make the circuit sound bad....
Still, if you want an extra 10VDC then you can put just a small cap right after the rectifier(s), start with something as small as 1µF and raise or lower the value until you get the desired result.

At least that's the best compromise I can come up with.

But something that I can learn on and expand on in the future.

Sure. Expansion possibilities will depend on the real estate and pecunia available, that's one of the beauties of DIY, isn't it?

Cheers,😉

 

[Toyman_PA]

Thanks Frank and Zobsky. I appreciate your honest opinions and help. I will be back with some questions after I build the PSU and cant get it to work. Take care and thanks again.

Toyman

 

[zobsky]

as you begin to consider the construction details, .. think about the physical layout and space for possible mods.

IIRC, .. it is also recommended that the power tranny and the choke are at 90 degrees in the horizontal plane to minimize interference

good luck!

 

[Brett]

12B4A

Works for me..........