• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

Toshiba Dual JFET Heatsink

Jump to Latest
#164
Scott, it is always possible for you, even if it has to come out from my own reserves. 😉

In this second batch, we have a pre-order of 350 pcs. Then 25 for Joshua, 30 (29) for sidiy, 25 for Scott, we still have 70 pcs left.

For 25 pcs, price including Paypal AND registered post is 65 USD, or USD2.60 per piece. For orders below 25 pcs, we charge an extra handling charge of 6 USD.

For small quantity orders in the US, you may also contact luvdunhill. He distributed the 1st GB for us in America, and I think still has some reserves left. Pls contact him directly.

For those wishing to order from us, please send a PM with postal address to Mark Lai. You will receive a pdf file for further instructions.

Best Regards,
Patrick
 
#168
The following 5 orders were sent by reg. post on April 29, 2009.

Pre-ordered 350
joshua_G 25
sidy 29
zhou fang 25
Jim Hamley 25

scott wurcer 25 (not paid yet)
J.P. (by PM) 25 (not paid yet)
20 pcs left.

Pls acknowledge to me upon received. Thanks.

🙄
 
#169
The following 5 orders were sent by reg. post on April 29, 2009.
Pre-ordered 350
joshua_G 25
sidy 29
zhou fang 25
Jim Hamley 25

J.P. 25 (paid)

scott wurcer 25 (reserved)

Sorry guys, this 2nd batch is sold out.
Thank you for all your support.

In case someone want small quantity. You may try to contact LUVDUNHILL.
 
#176
The following 5 orders were sent by reg. post on April 29, 2009.
Pre-ordered 350
joshua_G 25
sidy 29 Received
zhou fang 25
Jim Hamley 25

J.P. 25 posted on May 6
scott wurcer 25 Posted on May 6

dhole: sorry, let's see when will be the 3rd batch!
 
#178
Firstly I want to draw attention to all with heatsinks.

The photo we posted in the other thread somehow got mirrored. Peter Daniel has potted it well.

I attach the correct orientation here.


As to gluing :

How to describe a simple procedure over the internet so that you all understand ??

: (

Let's define orientation first.

Top is as it is upper side in the photo. Bottom is where the legs of the JFETs come out.

Assuming you use arctic silver, or any metal filled epoxy with small particle size (<20µm).
Mix small quantities of the adhesive with bamboo or wooden toothpicks.
Then smear the entire inner wall of the heatsink, and the outer surface of the transistors with a thin layer of glue.
Insert the transistor into the hole. You will probably squeeze out quite a bit of the glue, but it is unavoidable.
Whip off all the excess glue on the top surface with a cotton bud. There is no electrical connections here, so a bit of excess glue would do no harm.
Now place the heatsink with JFETs upside down on a piece of waxed (baking) paper, with the legs pointing to the roof.
Carefully wipe off excess glue on the "leg-side" face of the JFETs, making sure that no glue remains between the legs.
I use a pointed SMD tweezer to hold a very small cotton ball dipped in a bit of acetone for the purpose.
You can leave it to cure in this position.
If there is still excess glue left after curing, remove them with a scalpel.

We apply vacuum to help remove any air trapped and the glue to penetrate.
But this is way too complicated and bring marginal improvements.

Try to practice with toothpaste first. You can still wash them out later.
If you have glued incorrectly, and need correction, no panick.
Just dip the whole thing in boiling water.
The epoxy will soften sufficiently that you can push the JFETs out with a tweezer.
Make sure you clear off ALL old glue before regluing.

Hope it helps.


Patrick
 

Attachments

  • dual.jpg
    dual.jpg
    57.6 KB · Views: 416
You must log in or register to reply here.
Top Bottom