Suggested Multi-lug Can Cap Values for PS-1 PAM-1 and PAS-3

What are suggested Authenti-cap CAN values for the PS-1, PAM-1 and PAS3

I will be recapping them if the MK3 Recap goes well.

Sometimes I notice you guys use higher values in certain spots.

THX

Order some radial or snap-in electrolytics and set the custom values you want and avoid the can/quad cap altogether. This little module supplies both B+ and filament.

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Wow nice work. I am more interested in what values people are replacing the caps with now. Like the PS-1 has 2 x 10uF caps. I am sure you could go up in value. Not sure how high. Also PAM-1. If anyone has suggestions please post them. I want to redo my pams and ps-1. Looking for what values to increase to.

The PAM uses a 6X4 rectifier so you can safely put about 10µF on pin 7. Put 10µF more on the far side of the 4K7. What do you hope to accomplish by adding more capacitance?

bubbasweet wrote:What are suggested Authenti-cap CAN values for the PS-1, PAM-1 and PAS3

I will be recapping them if the MK3 Recap goes well.

Sometimes I notice you guys use higher values in certain spots.

THX

Refreshing pas3 psu is easiest done via one of the replacement boards, triode has one
http://triodeelectronics.com/sdslacabofor1.html
Another one that comes mounted and tested is tubes4pro : http://tubular-well.se/images/stories/virtuemart/product/tubes4pro-pas.jpg  ( i have only seen this one on ebay, but i can help with contacting the author  Mr Chong ) This latter board also has the option of installing 2 Si diodes to replace the 12x4, this will save the hard loaded transformer a lot.

I mounted capacitors upside down on the chassis with silicone adhesive on an insulating plate, and hardwired them, including dropping resistors and the rectifiers for the filament supply!

j beede wrote:The PAM uses a 6X4 rectifier so you can safely put about 10µF on pin 7. Put 10µF more on the far side of the 4K7. What do you hope to accomplish by adding more capacitance?

Less hum?

bubbasweet wrote:

j beede wrote:The PAM uses a 6X4 rectifier so you can safely put about 10µF on pin 7. Put 10µF more on the far side of the 4K7. What do you hope to accomplish by adding more capacitance?

Less hum?

I see you are guessing.. Wrong.
Hum in pas comes from cabling , the caps are more then enough.

Question for j beede --- could you post a picture of the bottom side of your Capacitor/Filament Supply Board?

Thanks in advance!!

peterh wrote:

bubbasweet wrote:

j beede wrote:The PAM uses a 6X4 rectifier so you can safely put about 10µF on pin 7. Put 10µF more on the far side of the 4K7. What do you hope to accomplish by adding more capacitance?

Less hum?

I see you are guessing.. Wrong.
Hum in pas comes from cabling , the caps are more then enough.

So you are saying higher cap values in a power supply does not take out excess ripple? I was always told it did. I do however agree the 6X4 is supposed to not be higher than 10uF as it may be hard on the rectifier tube.

To be honest it I don't really have a hum problem. It seems that for the MK3s anyway, everyone recommends higher cap values so I was just carrying this idea forward with the PS-1 and the PAMs I have. Is it not the same?

bubbasweet wrote:

peterh wrote:

bubbasweet wrote:

j beede wrote:The PAM uses a 6X4 rectifier so you can safely put about 10µF on pin 7. Put 10µF more on the far side of the 4K7. What do you hope to accomplish by adding more capacitance?

Less hum?

I see you are guessing.. Wrong.
Hum in pas comes from cabling , the caps are more then enough.

So you are saying higher cap values in a power supply does not take out excess ripple? I was always told it did. I do however agree the 6X4 is supposed to not be higher than 10uF as it may be hard on the rectifier tube.

To be honest it I don't really have a hum problem. It seems that for the MK3s anyway, everyone recommends higher cap values so I was just carrying this idea forward with the PS-1 and the PAMs I have. Is it not the same?

More capacitance reduces hum up to a limit. Increasing above this limit will get
less and less effect, and other sources of hum and noice will be dominating.

Increasing caps in MkIII is motivated ( by some ) not to reduce hum but to increase
the power reserve for loud parts. PAS is a class-A thing and will consume equal
amunts of power irrespectivly of signal or volume.

Where do you order these?? Kind of cool board.

THX

j beede wrote:Order some radial or snap-in electrolytics and set the custom values you want and avoid the can/quad cap altogether. This little module supplies both B+ and filament.

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