Difference of 300uF vs 200uF in power supply EDIT Solved

[ElectronAvalanche]

So I still have a bit too much bass on my #183 clone and wonder if the first PS stage filters do have any effect on this.

Has anybody done a test at high volumes comparing the 300uF to the 200uF caps?


I would guess there should not be any difference at LOW volumes.

Thankful for any comments on this!

Electron

hmm. seems like my question was answered back in 2006 (and I was even part of the answer, oh my, I am getting old).

https://tubeamparchive.com/viewtopic.ph ... ight=300uf

[Structo]

I remember that thread now.
I always meant to try that trick with the 10 watt resistor on the OT center tap but never did.

I used a couple 320uF Sprague's that I got from Steve on my last 100w build.
So 160uF total for plates.
It is on the border of stiffness when turned down but when cranked up it seems OK to me.

The other caps are 22uF

I tried 40uF on V1 and V2 but didn't like it.

BTW, Robben's #102 amp has 2 x 300uF I believe
and #183 uses 2 x 330uF.


This is from that thread:

Hi Guys,

On the subject of B+ filter caps and stiffness:

I was reading up in TUT1 and TUT2 recently, and tried out a trick.

I modified my deluxe reverb to have a dumble preamp in channel one. In addition to a bunch of mods (that I will not detail here), I increased the B+ filter caps. The result was a stronger and punchier bass. However, the negative consequence was too much stiffness. It felt like the amp was working against me, and soloing felt like wading through molases.

Solution. Place a 100 ohm (I might try a little higher) resistor in series between B+ and the OT centertap. WOW! Much more of a rubbery feel, while retaining the crispy low end on the bass. Makes the amp easy to play clean, or with overdrive/distortion pedals.

Jake