large heatsink will be available by april or sooner

[pooge]

Originally posted by hifimaker
One would not want to coat the mounting surface with anything, Mounting surfaces should always be bare aluminum or copper.

The oxidation and any corrosion does impact thermal efficiency.

-David

Originally posted by tms0425
Obviously true. I should have noted that the transistor mounting surface on the Conrads is definitely NOT coated.

Don't know about oxidation imparing THERMAL efficiency, but it does ELECTRICALLY insulate. Alumimum oxide spacers are some of the best among thermal spacer options between the transistor and heat sink.

[jtsaudio]

Yes.
Please offer heatsinks 10-12"wide, with height of 5"-6", with fins running vertically.

You will sell many to the members here!

-Joe

[lgreen]

Originally posted by jtsaudio
Yes.
Please offer heatsinks 10-12"wide, with height of 5"-6", with fins running vertically.

You will sell many to the members here!

-Joe

Agreed!

Russell, you are pretty much the only standard supplier of heatsinks on EBay and a lot of us have had very good experiences with you. Your sinks are very good and you have been dependable over the years.

We find ourselves wanting the following features-

- vertical fins
- powder coating /anodizing
- tapped and threaded holes!! (Standard TO-3 or your own known spacing so we can design PCBs or brackets to comply).
- Here is a BIGGIE- "BLANKS" for the front panel, back panel, and bottom/ vented top, with elbows or tapped aluminum corner pieces. Everything tapped/threaded to fit.

With some "blanks" you would go from a heat sink vendor to a heat sink & chassis vendor, and there is a very large need for chassis here. Think about whether you could do this. There is no reliable source of heat sunk chassis with everything the same color. We buy heat sinks and cobble together a front/back panel, top/bottom from other places.

Get a couple of standard sizes, 1U, 2U, 14" deep, 16" deep whatever.

Anyway, you asked and that is my opinion.

[hayenc]

Maybe you could work with DIYEnclosures again to get a setup with the large heatsinks. I know he was using your heat sinks on a previous chassis and could probably sell more of his nice chassis' if they were close to the First Watt specs for heatsinking and layout.

[flg]

Originally posted by tms0425
...Textured black polyester powder coating..."[/i]

Not just powder coating Textured
Texturing, beading or sandblasting to increase surface area will make a significant difference.
Personally, I like 3" fins, 1/2" between fins and 1/2" base. 6" wide is good, you can use 2 per side. But, 8" high.
Thx

[labjr]

Originally posted by flg

Not just powder coating Textured
Texturing, beading or sandblasting to increase surface area will make a significant difference.
Personally, I like 3" fins, 1/2" between fins and 1/2" base. 6" wide is good, you can use 2 per side. But, 8" high.
Thx

Would a one piece heatsink be better? I ask because on cvillers F5 boards the outputs are spaced only 3.25 inches apart.

[flg]

2 heatsinks would basically be the same as 1 large 1, equal to the size of 2. 2 does allow for electrical isolation without the use of isolators under the transistors. that would give you reduced thermal resistance. 6" wide heatsinks also allows for more universal use as you are not confined to the 1 larger size

[triode4]

Have these heat sinks ever been produced? I among many other people are waiting for Heatsink USA to have a product that is directly suited for a Pass F5 clone. Conrad's biggest heatsink is aproven design. Can you make one just like it or better?

[AndrewT]

Yes, Barred Boss has them shown as 10.08inches wide.
Click on and he supplies detail of the cross section.

[barrredboss]

Hello,
We do have a new 10" profile. This can be found on our website. Can someone send us a picture of the heatsink that was mentioned suited for a Pass F5 ?
barrredboss