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henryve 7th March 2017 08:05 PM

1 Attachment(s)
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!

WalterW 7th March 2017 08:31 PM

On your photo I don't see anything that doesn't fit? :confused:

henryve 7th March 2017 08:37 PM

Quote:

Originally Posted by WalterW (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide-post5011993.html#post5011993)
On your photo I don't see anything that doesn't fit? :confused:

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.

MASantos 7th March 2017 09:05 PM

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.

henryve 7th March 2017 09:10 PM

Quote:

Originally Posted by MASantos (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide-post5012033.html#post5012033)
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. ;)

bk856er 7th March 2017 10:38 PM

3mm spacers between the brackets and the heatsinks??

BK

6L6 8th March 2017 12:20 AM

Quote:

Originally Posted by bk856er (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide-post5012118.html#post5012118)
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.

Bones13 8th March 2017 01:24 AM

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.

6L6 8th March 2017 04:20 AM

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.

henryve 8th March 2017 04:22 AM

Quote:

Originally Posted by Bones13 (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide-post5012235.html#post5012235)
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. :scratch:


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