where to place extra filter cap

drembo · 30th March 2004, 05:56 PM

I am building a pair of 300B monoblock amps. After starting the project and manufacturing the top plates of the chassis, I decided to upgrade the power supply by adding an extra choke and filter cap. Originally, I was using 5U4G/15uf/choke/50uf(to 300B)/resistor/30uf(to both sides of 6SN7 input and driver). Now I have 5U4G/30uf/choke/50uf(300b)/choke/50uf(driver side 6SN7)/resistor/50uf(input side 6SN7). I only have spots for a 30 and two 50uf polypropylene and oil caps on the top plate so I am adding a 50uf Solen metalized polypropylene cap inside. My question is, at which node should I use the Solen cap to maximize any sonic benefits I may garner through the use of the oil caps?

fdegrove · 30th March 2004, 09:06 PM

Hi,

If it were me I'd put the highest quality cap at the input stage 1/2 6SN7 and highest value cap at the 300B.

Space permitting, Solen at the input as said, and move the poly&oil towards the powertube to add to the existing cap.

Cheers,

martinab2 · 30th March 2004, 09:33 PM

If you haven't already tried it then PSU designer from Duncan Amps is worth a go. It allows you to simulate different power supply circuits and see the output waveforms etc. Free download from http://www.duncanamps.com/software.html

30th March 2004, 05:56 PM	#1
drembo diyAudio Member Join Date: Aug 2003 Location: Orange, California	where to place extra filter cap I am building a pair of 300B monoblock amps. After starting the project and manufacturing the top plates of the chassis, I decided to upgrade the power supply by adding an extra choke and filter cap. Originally, I was using 5U4G/15uf/choke/50uf(to 300B)/resistor/30uf(to both sides of 6SN7 input and driver). Now I have 5U4G/30uf/choke/50uf(300b)/choke/50uf(driver side 6SN7)/resistor/50uf(input side 6SN7). I only have spots for a 30 and two 50uf polypropylene and oil caps on the top plate so I am adding a 50uf Solen metalized polypropylene cap inside. My question is, at which node should I use the Solen cap to maximize any sonic benefits I may garner through the use of the oil caps?

30th March 2004, 09:06 PM	#2
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, If it were me I'd put the highest quality cap at the input stage 1/2 6SN7 and highest value cap at the 300B. Space permitting, Solen at the input as said, and move the poly&oil towards the powertube to add to the existing cap. Cheers, __________________ Frank

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30th March 2004, 09:33 PM	#3
martinab2 diyAudio Member Join Date: Mar 2004 Location: aberdeen, uk	If you haven't already tried it then PSU designer from Duncan Amps is worth a go. It allows you to simulate different power supply circuits and see the output waveforms etc. Free download from http://www.duncanamps.com/software.html

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