| Fix |
European GB for Heatsink with fan for the KrellClone KSA-100-MKII
I got a price quote from FischerElektronik about 100/each
Will get final quotes next week I hope.
LA 1 02 230 + axial fan, Total of 8x TO-3
H 71.5mm (heatsink)
* Optional
LA 1 03 230 + axial fan, Total of 12x TO-3
H 108mm (Heatsink)
(This model could be better, larger heatsink...)
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| Fix |
I got a price quote from HS Marston in UK
Similar heatsink
100mm Long instead of 71mm
Pre-drilled for TO-3 (2 on each heatsink / total of 8)
Price:
25pcs £86.09 ex works.
10pcs £98.36 ex works.
+£30 for fan 230v |
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| Fix |
Got mail from Fischer Elektronik, they will give quotes this week.
They have much to do... |
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| Fix |
Price Quote from Fischer Elektronik
This model is 108mm long Heatsink + fan.
Special model for better cooling.
LA 1A 03 8 X TO 3 230V - With 8 x TO 3
H 108mm (Heatsink)
1 116,50 ea.
10 97,20 ea.
25 86,35 ea.
50 77,70 ea.
+ drawing costs / once 40,00
Leadtime: about 6 7 weeks after receipt of order |
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| Fix |
Anyone more interested ?
Would be cool to make an order following 2 weeks.
And if we can reach 10pcs then the price is ok.
They are pre-drilled for 2x TO-3 on each heatsink.
Maybe we can make 3x TO-3 for total of 12 for people who want to add more power ... |
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| Landoctor |
I would be interested, but I am looking for a set similar to the one in the first picture with 10 T-03's per side(20 total). I want to use it for a stereo KSA100 MKII.
Let me know what you find out on price for that model, and I might be interested. I guess two of the 12 device versions would work as well, but that is getting to be too expensive. Is there another manufacturer that makes these? Maybe they would have better pricing. I know Fischer is not known for their pricing.
Thanks,
Donovan |
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| Fix |
For the moment there are 8x TO-3 per channel/heatsink like the original KSA 100.
But since we are using 100mm heatsink we surly can pre-drill 4 more holes. total of 12 TO-3's on each heatsink.
Guess it would be more or less the same price.
Also for those who want to make their own tunnels, heatsink is available in lenght of 1 meter for about 60 / pcs |
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| jacco vermeulen |
| quote: | Originally posted by Fix
heatsink is available in lenght of 1 meter for about 60 / pcs |
Which ads up to some 27 for a set of 4 heatsinks of 108mm.
You can throw away the 230V fan for a Class A power amp.
(provided you're not interested in DIY RPM-controller lessons) |
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| Fix |
Sure you all can make your own tunnel, but I'm lazy and thinks it's nice to have the tunnel complete with all drilling :-)
It would be nice if you could try to get a groupbuy within the next 2 weeks.
And for thσse who just want to buy the raw heatsink, just sign up. |
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| krmaudio |
Hello,
just looking over the heatsink, did anyone notice the orientation of the T03 transistors?
The imi marston has diagonal mounting holes and the original krell has the devices inline...... |
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| Fix |
That's true...
But since we are ordering from Fisher instead, we can have the TO3's mounted as we want since they will make it custom. |
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| krmaudio |
Are you guys going with the 8 transistor sink? as the krell original?.....
I was just looking through the farnell catalogue and noticed the imi sink, although looks like they have swapped to fischer in the latest catalogue, i would love to get into this group buy but i missed the pcb's |
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| samoloko |
what is going on with this buy
nobody Is interested |
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| krmaudio |
Im up for a set of sinks as the krell original........
what can i say.....no news on heatsink no news on uk tx no news on any pcbs........
possibly people with no money at moment lol..... |
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| samoloko |
| what for 40 euro cost Is needed for LA 1A 03 08 If they are predrilled for TO-3 |
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| Fix |
Been away for awhile, shall we try to get back on track.
People that's interested in
1. Complete Heatsinks
2. Raw heatsink, DIY
Fix @ 2 - #1 |
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| samoloko |
Hi Fix
could you please see on farnell.com H S MARSTON FC-M2 module kit (148450 order code) and FC-C2 construktion kit (148453 order code)
I think both modules assembled are like the fischer module for 8 to-3 but the price Is 39 pounds + 35 pounds which Is lower than the fischer price |
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| Fix |
Guess you need 4x to build a complete kit.
Also I did mail HS Marston for price quote, and they were more expensive than Fischer.
The version from Fischer is Custom build, and pre-drilled with a Fan.
Just mount those TO-3's :-) |
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| samoloko |
I would like to get LA 1 02 TO-3 (L = 71 mm) which Is for 8 transistors
less expensive
depending on price I will take from 2 to 4 complete modules with fan
what are your preferences are you going to use 8 or 12 transistors
also are the drilling price of euro 40 Is paid for all pcs that we going to get
if there are not much pcs I think we can drill It ourselfs |
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| samoloko |
how many are Interested In this GB
what are your preferences 8 TO-3 or 12
I would like 8 - price Is better
please reply
I have an alternative to buy H S MARSTON from farnell |
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| jacco vermeulen |
Sammy,
if you're interested i can stop by at this (scroll all the way down) place when i'm in the neighborhood to ask if they still have some of the package deals left.
They've been lying on the shelf for quite some time, but when i picked some up all of them were still nicely factory wrapped, the Papst fans on my assemblies turned out 100%.
No frig-gin idea what the shipping cost to kick 'm over to your doorstep would amount to, of course.
BuTuWu:
the Quasi-Oz posted a cool idea on derating an AC-fan at one of his quasi-complementary amp threads.
An estimate can be calculated with the fan coil data and series LC formula, easiest would be to stick a low value foil cap (high voltage) in series with the coil and just see what's happening.
I just tried it with an 80mm Papst AC fan and it works like a charm, even a great way to get rid of Polyester crab caps. |
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| samoloko |
Hi Jacco
that would be great
of course I would like to get opinion of Fix, Floedstrome, Krmaudio, etc
but If the price Is better than the Fischer and H S Marston I'll take 4 pcs
I wonder what heatsinks you are using for that amp
thx |
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| Fix |
This fan cooled heatsink that I'm trying to make a GB for should be as similar as the original.
If the majority think we should change any specs or someting please let me know.
Since they are making a "custom" heatsink we can make it as we want.
The goal here is:
To get a complete, pre-drilled heatsink with a 230v(120v) fan as the original were with 8xTO-3 in total.
And you will need one heatsink @ channel.
I wanted to get most work done, and just start mounting the components...
Price Quote from Fischer Elektronik
This model is 108mm long Heatsink + fan.
Special model for better cooling.
LA 1A 03 8 X TO 3 230V - With 8 x TO 3
H 108mm (Heatsink)
1 116,50 ea.
10 97,20 ea.
25 86,35 ea.
50 77,70 ea.
+ drawing costs / once 40,00
Leadtime: about 6 7 weeks after receipt of order |
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| Fix |
Yes I did, I mailed him...
Will see if he replys. |
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| jacco vermeulen |
| Did Samoloko not answer the question with the link in his post. |
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| Fix |
Jacco:
Do you have any real phots of it ?
Have you used them for this project or other ? |
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| jacco vermeulen |
Last time i was there i bought a number of both A and B models, as they were so affordable.
I've used a large B-type assembly for the A100 boards MikeW gave me, still need to build a case big enough to hold the 12" high heatsink setup.
Pictures of the A-model were also posted at the KSA100 thread, well over a year ago.
As most others, i've had to wait so long for the CRDs of the KSA100 that i started other amp projects, still need to finish the Krill the moment the active project list is blank again. |
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| jacco vermeulen |
As you can see from the picture, these are not stacked modular ones as in the sheet Samoloko linked to, but have a single heatsink in each quadrant.
Better this way, less temperature diference between the two ends of the heatsinks.
(i'll use all 12 output device mounting positions, i'm not going fancy TO3 on the KSA100 and there's both a thermal and Hfe advantage to use 12 instead of 8 Motorola metal can devices) |
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| samoloko |
Fix
waiting for clofis reply
I think that this modules are very good for the price of 40 euro (shown on site) don't know If that Include VAT
are the module include VAC fan
I would like to get 4 pcs |
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| rufus13 |
| I have some heatsink/fan modules for sale. They are older by the "W. Germany" marking on the Papst 20W 120V fan on each one, but aluminum is un-pitted and the fans seem quiet at full-blast. Assembly can accept foam dirt filter under metal screen. Twelve T03 devices (3 per quadrant) can be fitted. The extrusions and framing are very similar to those Krell used in the KSA-100. I'd like $160 for the pair. |
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| samoloko |
| rufus can you mail me |
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| RKH |
rufus,
I'll be second in line if needed. e-mail me via this forum.
Thanks
Ryan |
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| Fix |
Rufus,
I might be interested.
But need to have some measurements before
If there are any still left.
- -
Jacco,
Do you have extra of the heatsinks ?
- - |
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| rufus13 |
This means that I can't e-mail any of you. I have the 2 HS Assy's shown and 10 more that are not stripped and are mounted on five 3U panels as pair.
Here is my e-mail (inside attached image)if you would like to contact for more images, measurements, etc. |
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| samoloko |
are we going to do gb or no
Fix do you have reply from clofis
would Jacco help us with It |
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| Fix |
I think we should go for the GB to make a custom Heatsink.
Why ?
Then we get exactly what we need and want.
And also others that will build the amp can order the heatsinks in future.
But,
If there is no intrest, then I will try to find an other solution. |
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| Tarasque |
Hi,
I would be interested in 4 sinks. As I'm using TO247, I would not like then drilled.
Thanks |
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| Roar Malmin |
Hi,
I have one small heatsink, drilled for 12 x TO3, complete with Rotron Whisper fan, 230V. The cooling elements are of the A-type,lenght 144mm. I also have three big ones, total lenght 363mm, with one fan in each end, one pushing, one sucking. They are Papst 230V, model 4658.
100 for the small one, 250 for the big ones. P&P at cost.
Regards
Roar |
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| Roar Malmin |
| And the big one. |
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| Fix |
Tarasque:
Guess we can order both drilled and not drilled.
Or even if possible drilled for both T0-3 and TO-247
Since we need atleast 10pcs to get a fair price, we then have
Fix @ 2
Tarasque @ 4
Samloko @ 4
So basicly we reach the goal... Don't think we can get 25pcs
But maybe we get a little bit lucky. |
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| samoloko |
Fix, I am Interested at 4 only with the clofis.nl price of EUR 40
did they reply to you
With another supplier If the price Is expensive I will get 2
what Is going on with the x-formers |
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| Tarasque |
| quote: | Originally posted by jacco vermeulen
As you can see from the picture, these are not stacked modular ones as in the sheet Samoloko linked to, but have a single heatsink in each quadrant.
Better this way, less temperature diference between the two ends of the heatsinks.
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Hi Jacco,
Would you know what the thermal properties are of these units?
I want to use tham for an X250 |
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| jacco vermeulen |
Marcel,
the 3-unit size does about 400W under standard operating conditions, 900W if noise is not an issue.
Derated, it's able to handle the 250-300W dissipation level of an X-250.
Only But is that a CLX-250 requires a 4-deck heatsink, doesn't it have a 16-device output stage ?
An oldy Seifert catalogue can be downloaded from the Clofis site, it contains a separate section on forced airflow assemblies around P-90, including a simplified description of how to calculate dissipation and various temperatures of blown heatsinks. |
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| Tarasque |
Thanks Jacco!
I use 20 devices in the output stage (2x5) and a slightly higher bias
Do you expect any issues in difference in device temperature along the sink (single sink like you described)?
What kind of fan noise do you have? |
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| jacco vermeulen |
You'll always have temperature differences between output devices, unless there's no discontinuity in the heatsink.
An example of the latter would be a concentric heatsink arrangement , something like Morten's (Magura) carbon fibre mega amp project.
Audio magazine in Germany made thermal pictures of a Threshold SA/1 model during the warm-up stage, the article appeared somewhere around 1990. The sequential pictures showed a disharmonious temperature elevation, and relatively large differences in temperature between various areas in the "stasis quo" condition.
Vertically mounted output devices on natural convection heatsinks are subject to local differences in heatsink temperature. The air flowing from the bottom of the heatsink also heats up as it moves to the top edge, mounting devices asymmetrically can somewhat eleviate it but just think how many have used the symmetrical dual mounting flange MF30-2F Conrad heatsinks for their PL power amps.
Vertically stacking 3 or more output devices on a blown heatsink means the temperature difference between the ones furthest apart will be larger than e.g. the 2-row Conrad heatsink set-up. On the other hand, the fan cooled ducted heatsink is thermally homogenous in the horizontal plane and a natural convection heatsink is not. While the 4 output devices on each horizontal plane of the fan duct have close to identical temperatures, the natural convection one will show a difference between the center and the outer edge of the heatsink. A forced-air or natural convection set-up will hardly make a difference in the thermal equilibrium stage, it'll show as DC-offset during warm-up.
The noise level totally depends on the selected fan model, type and rev number.
The stereo SKA50D i assembled has a total dissipation level of 220W, with a derated fan it can hardly be heard at 12ft distance.
My mono KSA50 clones each have six 80mm Papst fans on dual thyristor heatsinks, similar to the KL-182 in the Seifert catalog.
At 250cbm/h (~150cfm) they do close to 50dB, but they're in the "kruipruimte" under the living.
Inaudible unless you hold an ear to the floor, 2" dual layer oak on a concrete floor, the level underneith is fully insulated with expanded polystyrene foam and pearls.
Notta badda for a close to 75 year old home. (it was built as a dedicated private foster home and has a number of special features)
Not exactly service friendly though, i've been contemplating of making 2 openings in the living room floor for elevator modules. |
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| Fix |
******************************************
I totally forgot about another option....
My girlfriends father have all tooling needed to drill, cut etc for the heatsinks.
I talked to him yesterday and he promised to help out for a small amount $
Then we can buy raw length of the heaksink (1m) for apx: 50 / unit
1m is good for 2 units.
This will lower the cost to 25 heatsink + fan + work = ~45-60 per unit instead of ~100
So my question is:
Is this a better solution ?
Then we also can pre-drill exactly what you want. |
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| Tarasque |
Hi
This is perfect for what I want.
To mount the heatsinks, you would also need mounting brackets and insulator pad's. Are you going to order those as well? |
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| Fix |
I could make complete kits, but I think I prefer to just handle the "heatsink" all other parts free to get for your self.
If I don't get any response next two weeks then I'll just order 1m heatsink for myself. |
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| Tarasque |
I would need approx 4m of heatsink in order to build 2 tunnels of approx 40cm and 1 tunnel of approx 20cm.
I can drill my own holes and cut the sinks to the correct length.
I might be interested in another 2 m if we can get a discount. |
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| samoloko |
| what is the price of complete heatsink |
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