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Sony Vfet Illustrated build guide
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Old 7th March 2017, 08:05 PM   #101
henryve is offline henryve  South Africa
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Murphy is having the last laugh at my expense.

Received my 4U/400 chassis today, and my layout does not fit, by about 3mm on either side. So I will have to do my own angle brackets as I see that there is about a 8mm area of unused space on the angle bracket. If I move all the holes in the bracket outwards by say 6mm, I will have the gap I need to fit my PSU, as I want to do a dual mono construction.

Bugger!
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Old 7th March 2017, 08:31 PM   #102
WalterW is offline WalterW  Netherlands
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Sony Vfet Illustrated build guide
On your photo I don't see anything that doesn't fit?
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Old 7th March 2017, 08:37 PM   #103
henryve is offline henryve  South Africa
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Quote:
Originally Posted by WalterW View Post
On your photo I don't see anything that doesn't fit?
It looks deceiving on photo, but amp boards overlaps the caps by 1mm. I am resting the amp boards on 2 cups. It is supposed to go lower when fitted to the heatsink (to be in center of heatsink). The caps on the PSU board should stand taller than the level of the amp board.
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Old 7th March 2017, 09:05 PM   #104
MASantos is offline MASantos  Portugal
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If you rotate the PSU boards 90 then it should fit with the connector beneath one of the amplifier boards. Not the best layout but it shouldn't be a problem.

Or you could build a bracket to mount the PSu boards on the side with the capacitors horizontal. Might even help with convection through the caps.
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Old 7th March 2017, 09:10 PM   #105
henryve is offline henryve  South Africa
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Quote:
Originally Posted by MASantos View Post
If you rotate the PSU boards 90 then it should fit with the connector beneath one of the amplifier boards. Not the best layout but it shouldn't be a problem.

Or you could build a bracket to mount the PSu boards on the side with the capacitors horizontal. Might even help with convection through the caps.
That is an option, although it would not look as nice. I will see if I can convince my OCD nature.
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Old 7th March 2017, 10:38 PM   #106
bk856er is offline bk856er  United States
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3mm spacers between the brackets and the heatsinks??

BK
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Old 8th March 2017, 12:20 AM   #107
6L6 is offline 6L6  United States
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Sony Vfet Illustrated build guide
Quote:
Originally Posted by bk856er View Post
3mm spacers between the brackets and the heatsinks??
No.

The brackets must be flat against the heatsink with thermal grease and torqued properly to ensure maximum thermal transfer. Spacers will effectively turn the heatsink off.
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Old 8th March 2017, 01:24 AM   #108
Bones13 is offline Bones13  United States
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Maybe just tap some new holes in the heatsink, and move the T bracket up just high enough to clear your caps.

Seems easier than starting over with a new L bracket.
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Old 8th March 2017, 04:20 AM   #109
6L6 is offline 6L6  United States
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henryve -

You could flip the perforated baseplate over, and use it with the lip pointed up, or just remove the perf plate altogether. If you are trying to eek out a few MM, it may be all that's necessary.
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Old 8th March 2017, 04:22 AM   #110
henryve is offline henryve  South Africa
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Quote:
Originally Posted by Bones13 View Post
Maybe just tap some new holes in the heatsink, and move the T bracket up just high enough to clear your caps.

Seems easier than starting over with a new L bracket.
Another option, but it would then mean that the heat won't spread well to the lower parts of the heatsink, making it less effective. I will think this over. Aluminium is quite cheap here. It is the machining that will cost the earth. I could drill it myself, but I would have to be super accurate with the TO-3 hole pattern.
 

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