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A guide to building the Pass F4 amplifier.
A guide to building the Pass F4 amplifier.
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Old 3rd February 2014, 07:02 PM   #131
delecoy is offline delecoy  United States
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A guide to building the Pass F4 amplifier.
Thank you . Back at it tonight.
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Old 4th February 2014, 07:04 PM   #132
delecoy is offline delecoy  United States
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A guide to building the Pass F4 amplifier.
Default Power supply stuff

For a dual mono power supply ( other than the transformer ) would I need two or four bridge rectifiers? Have 8 50V capacitors @ 33k uF each.
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Old 4th February 2014, 07:33 PM   #133
Triodethom is offline Triodethom  United States
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Quote:
Originally Posted by delecoy View Post
For a dual mono power supply ( other than the transformer ) would I need two or four bridge rectifiers? Have 8 50V capacitors @ 33k uF each.
How is the transformer configured on the secondary ?
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Old 4th February 2014, 07:38 PM   #134
delecoy is offline delecoy  United States
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A guide to building the Pass F4 amplifier.
It's an Antek AS-4218, so dual secondaries. Which, interestingly enough, are scheduled to be available again tomorrow ( after a loooooong time ) according to their website.
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Old 12th February 2014, 02:46 AM   #135
RevMen is offline RevMen  United States
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Hello again, friends.

I am working on ordering parts for the v3 universal power supply. I was hoping someone could recommend parts or at least values for the two snubber resistors and the capacitors. The note on the BOM says "See forums for more information" which leaves a lot of ground to be covered, so I thought I'd start here.
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Old 12th February 2014, 03:35 AM   #136
6L6 is offline 6L6  United States
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A guide to building the Pass F4 amplifier.
Don't use a snubber on a class-A amp.

Easy!
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Old 12th February 2014, 05:16 AM   #137
valvesound is offline valvesound  South Africa
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Quote:
Originally Posted by 6L6 View Post
Don't use a snubber on a class-A amp.

Easy!
Hi 6L6, please tell us why.

Thanks
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Old 12th February 2014, 11:54 AM   #138
6L6 is offline 6L6  United States
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A guide to building the Pass F4 amplifier.
Snubbers are made to damp the ringing of a PSU when the load varies. Especially large power-on, power-off spikes.

A Class-A amp should have a constant draw. No snubber necessary.
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Old 12th February 2014, 11:57 AM   #139
Zen Mod is offline Zen Mod  Serbia
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A guide to building the Pass F4 amplifier.
they can also tame HF garbage from mains
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Old 12th February 2014, 11:59 AM   #140
6L6 is offline 6L6  United States
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A guide to building the Pass F4 amplifier.
I am thinking about PSU output snubber, after the CRC... You are right, a snubber on the bridges can be very helpful to reduce the mains junk.
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