Pictures of your diy Pass amplifier

[aradan]

Grimberg it looks as great as it sounds 🙂

Sent from my F8332 using Tapatalk

 

[brianco]

🙂 Excellent Mr G.

Work to be very proud of.


EDIT: What elcaps are you using in the PS?

 

[grimberg]

Those are Cornell Dubilier (CDE) 33000uF x 25V Snap In type.

http://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/380LX333M025K052/?qs=sGAEpiMZZMtZ1n0r9vR22dctXbdJ0qvskRDEMgDnjAA%3d

 

[rchomeless]

My first watt M2 clone, no hum, dead silent
my PCB
400va 18vac china custom made shielded trans
15000uf 35v * 8
cutting boards front and back
non-anodized heatsink 300mm * 150mm

 

[ElFishi]

non-anodized heatsink 300mm * 150mm

Can you measure the temperature of left and right heatsink and possibly of the output MOSFETs?

 

[rchomeless]

Can you measure the temperature of left and right heatsink and possibly of the output MOSFETs?

heatsink left 42.6 and right 43.3 degree
on one mosfets 50.1 degree

 

[rchomeless]

🙂

 

[Attila I]

The right sink is hotter due to mosfets being mounted in upper half of it

 

[ElFishi]

heatsink left 42.6 and right 43.3 degree
on one mosfets 50.1 degree

thx, nice experiment. I would concur with attila. Low enough temperatures, not a big difference. But interesting to see it can be measured.

 

[grimberg]

...nice experiment...

But unfortunately incomplete. What was the room temperature at that moment? Unless you know that, it is not possible to evaluate how good a job the heat sinks are doing.

 

[rchomeless]

But unfortunately incomplete. What was the room temperature at that moment? Unless you know that, it is not possible to evaluate how good a job the heat sinks are doing.

room temperature 19 degree 🙂

 

[grimberg]

It looks as if it will be all right, even during the summer when temperatures in Hong Kong reach close to 30˚C. Also, from the pictures it appears the case is sitting directly on the table top. If that is true, once you add feet convection will be more effective and temperature should drop another 3˚C or so.

 

[rchomeless]

chassis temperature about 39.3~39.6

 

[AndrewT]

That tells you that the internal temperature is ~ 20Cdegrees above room ambient.
When room ambient goes up to summer temp of ~ 30degrees C, then the internal temperature will rise to ~ 60degrees C.
That is too hot.
What is the chassis ventilation like? Are there any holes in the floor. Is there room for air to pass through.
Is the heatsink causing the whole chassis to rise to that high temperature?

I have never known an internal temperature to be so close to heatsink temperature.

 

[Rodeodave]

New mini Aleph J standing tall.

The amp in the middle is a DIY Sony VFET, and the one inside the Expedit cabinet is the Mini A that's getting replaced by the new one.

More pics to come!

 

[vdi_nenna]

BOZ-J

Here's a quick boz-J built with mostly spare parts. 🙂

 

[laverda]

Duel mono BOZ....not sure the star earthing ads to the sonic improvement or the duel PSUs..or both but its quite a step up from the norm ...

 

[soldersober]

room temperature 19 degree 🙂

Yep, that sounds like February in HK 🙂

 

[rchomeless]

That tells you that the internal temperature is ~ 20Cdegrees above room ambient.
When room ambient goes up to summer temp of ~ 30degrees C, then the internal temperature will rise to ~ 60degrees C.
That is too hot.
What is the chassis ventilation like? Are there any holes in the floor. Is there room for air to pass through.
Is the heatsink causing the whole chassis to rise to that high temperature?

I have never known an internal temperature to be so close to heatsink temperature.

i encountered that the internal temperature as hot as on the heatsink , it may be the thermometer touched the top plate.

 

[rchomeless]

Yep, that sounds like February in HK 🙂

yeah, the measurements done yesterday🙂