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Old 11th September 2002, 12:53 AM   #11
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Default Prices

The price quoted is actually in US$. I know that if I buy a huge quantity (a minimum of 20 pcs), the price will come down to $8 a piece. Although, I am not sure if it is economical to get those heatsinks to be shipped abroad such as US, those things are HEAVY. I will weigh it though, and get some quote for the shipping cost. Also, a quick question about transformer, can I get away with 500VA Toroid for each monoblock of the Aleph 2? I know it is very small, can I compensate the with large cap value? ie. 500k uF? Thanks.
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Old 11th September 2002, 01:53 AM   #12
fcel is offline fcel  United States
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I would have to say 500VA per monoblock is too small.

Now about those heatsink ... please still check it out ... some of us might still be interested. Thanks.
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Old 11th September 2002, 01:58 AM   #13
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Default 500VA transformer

As somebody said before about my DAC:

It would be a pity to spoil the ship for a halfpenny's worth of tar.

Go at least for 750VA.
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Old 11th September 2002, 02:35 AM   #14
fcel is offline fcel  United States
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Default Sizing transformer

I remember somebody on this forum said that the rule of thumb for sizing transformer for Class A amp is as follows:

(Output power per channel) X 7.5 = size of transformer

which for Aleph 2 came up to be 750VA.

Now of course I can't find (search) who said that. So, please don't quote me!
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Old 11th September 2002, 02:41 AM   #15
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Hello Tjong,
Sorry this is off the topic, but I too live in Jakarta. Btw, where did you get the IRF mosfet for this monster?

For everybody,
I've seen lots of those heat sink in Indonesia. Btw, how much this kind of heat sink (the one Tjong showed us) in US?

Regards,
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Old 11th September 2002, 03:12 AM   #16
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Default Heatsink Availability

Sianturi, I would be very happy man indeed if you can show me where to get other heatsink for aleph 2 amp. I, too, have seen so many kind of heatsink, albeit, all of them are very small and so "regular." The problem that I got so far it is almost impossible to find a nice BIG heatsink for the amp. When I saw this heat sink, I thought I will joint 6 of them standing vertically to make up for one side of the chassis for a total of 12 for each monoblock. In regard to the mosfet, I got a friend of mine who went to Singapore, and get it from there. If you want to get it, I still have 50 of it left unmatched (IRFP240).
For those who are interested in the heatsink, please look at my previous post regarding the price.


Fcel, I have to go the the store to reconfirm about the availability and, hopefully, lower price for them.
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Old 11th September 2002, 03:33 AM   #17
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Default Oops

Hello Tjong,
You're right.... I've just checked my heat sink, it looks VERY similar to the one you show, only, It got the "T" part for attaching TO3 case, and in smaller size.
It looks like this:

\
-|--
/

While yours is like this:

\
-|
/


Btw, I've once checked some local shipping company rates. For Indonesia to US, 4 kg = US$194

up to 45 kg = US$18/kg.

Hope this helps,
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Old 13th September 2002, 01:07 PM   #18
CH2 is offline CH2
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Hi There

I am from Singapore.

Was wondering how heavy are those heat sinks?

I have not started on my Adelph project yet, due to a lack of suitable heatsink.

I might need to ship those stuff over.

Cheers
CH2
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Old 13th September 2002, 03:00 PM   #19
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Default Heatsink Availability

I haven't weigh it yet. Just a quick suggestion, you could probably obtain some heatsink from AAVID, they have a rep based in Singapore. You could probably contact them to ask wether they have a distributor there for thei product. In regard to my heat sink, I will inform you later.
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Old 13th September 2002, 05:14 PM   #20
nar is offline nar
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I think R theta would be fine ,they have big big sinks
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