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Old 31st May 2013, 12:02 AM   #21
2bz is offline 2bz  United States
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Originally Posted by 6L6 View Post
B) Match the N-channel to the N-channel and the P-channel to the P-channel. The bias pots will make up for the N's and P's not matching.
So, I need 8 Ps within 100 mV and 8 Ns within 100 mV. Yes?
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Old 31st May 2013, 12:15 AM   #22
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Yes.
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Old 31st May 2013, 12:43 AM   #23
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no. 2 batches of 4 p's. and 2 batches of 4 n's. you dont have to match ch 1 with ch 2.
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Old 31st May 2013, 12:54 AM   #24
6L6 is online now 6L6  United States
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Oh, Duh. Sorry.

AudioSan is completely correct.
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Old 8th June 2013, 02:08 PM   #25
2bz is offline 2bz  United States
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Slow going on the F5TV3 build. I am in the process of collecting all the parts. I have also built a MOSFET match/tester. Hope to match the MOSFETs this weekend.

I have decided to go with liquid cooling. I have attached a photo of the cold plate. It is 4" x12" x 1/4" copper plate (4 pounds!) plus the 3/4" copper plumbing. More to follow.....

Any recommendations for a good/cheap 1.5kVA 2X32v toroid? ANTEK?
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Old 8th June 2013, 05:07 PM   #26
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Default You heatsink design

It will be interesting to see the thermal gradient of the copper plate, measured near the MOSFETs at the "water entry" and "water exit" ends (i.e., the plate will become hotter and less effective on the right side, assuming the water flows from left to right in your picture......that's part of the problem with many water manifold designs).
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Old 8th June 2013, 11:04 PM   #27
2bz is offline 2bz  United States
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Originally Posted by CanAm Man View Post
It will be interesting to see the thermal gradient of the copper plate, measured near the MOSFETs at the "water entry" and "water exit" ends (i.e., the plate will become hotter and less effective on the right side, assuming the water flows from left to right in your picture......that's part of the problem with many water manifold designs).
I am planning to have a thermal sensor both at the entrance and exit of the cold plate. I have a 1.25 hp hot oil pump that can move 25 gal per minute ( only half kidding). I suspect that the flow rate will overcome the mosfet heat dissipation.
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Old 9th June 2013, 08:54 PM   #28
2bz is offline 2bz  United States
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I Vgs matched the Vishay IFR240s and 9240s and now have my two matched quads of each. The copper coldplate is done also.

I have 12 of each of the 240 and 9240 up for grabs, matched within 100 mV, if anyone is interested. I don't know what ask for them, so if you are interested make me an offer. If they don't sell, I will RMA them back to the wholesaler.
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Old 13th June 2013, 12:01 AM   #29
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I got the ecaps for the power supply today: .22F @ 50V for each channel. 3 x 25A rectifiers per channel.
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Old 13th June 2013, 11:37 AM   #30
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i would be carefull with this PSU's. rectifiers without heatsinking in class A amps is a very very bad idea.
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