Noobie PSU question: PreAmp build (Classic One)

[hempie]

Hello DIY,

Two Quick questions on this PSU Build
I have circled in green on the PSU schematic image: what Im referring to

Question 1:

C10: 1uF/250V Capacitor after the bridge rectifier:

I'm unfamiliar with this being there, is it some sort of bleeder/filtering device?
It goes straight to ground and its voltage rating is so high (DC/AC)?
Is there a part recommendation i can use for this? -

I have a few of these in my parts bin:

QXK2J105KTP | Nichicon 1μF Polyester Capacitor PET 250 V ac, 630 V dc +-10% XK Series Radial | RS Components


Question 2:

I have the transformers
I noticed they are 230v (where as, in Australia we have 240V AC mains)

I connected them and they work fine, but the power higher on all the secondaries as a consequence....the only reason this bothers me is i know that BIAS is real important in this project,
I know it is no big deal with the regulated heater cct.

But the Tube Rectifier and the supply going to the Amp Valves will be higher Volt - Maybe under load this does not matter? Or it is easy fix with a resistor in series??


If you would like me to clarify anything more please let me know also!


Here is the links of the Full Build and PDFs ect

http://www.triodedick.com

http://www.triodedick.com/classic_1/classic_one_schema_versterker.GIF

http://www.triodedick.com/classic_1/classic_one_schema_voeding.GIF

 

[Tom Bavis]

5% higher voltage won't matter. Heater voltage is regulated, though you might check the rectifier's heater voltage - a small resistor can be added if necessary.

Heater supply has the 1 uF for an AC ground connection, to filter common-mode noise (coupled through primary-to-secondary capacitance). A 100V cap would do, anything higher is fine.