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Old 17th March 2005, 01:17 AM   #11
Buhl is offline Buhl  Denmark
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Location: Aalborg, Denmark
Default Pearl boards

I must say that sounds appealing, 15 euro is a nice price I think. I assume that it is good quality fibreglass, plated through holes, and so on ??

You may sign me up for four (4) boards - what are your time horizon on the end of the group buy ?

The Q's would also be a good thing to offer - here in denmark, ztx450 is hard to obtain, vs. 2sk170 (not BL) and 2sk389 is obtainable.
But, the advantage would be if prices could be lowered if many Q's was orderd at the same time ??
What do you estimate a complete Qpac would run to ?

Cheers !
Hans
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Old 17th March 2005, 06:20 AM   #12
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The quality is like the original boards. Double sided with contact through holes, solder stop on both sides and component print on top.
1,5mm pcb.

What was in the Q pack inkluded?
The transistors only or what more?

For the 10uF PP caps I would propose 10uF 400V MKP-QS Audyn Caps from Intertechnik. I use them all the time and they are one of the best caps around. They cost 3,87 Euro but I think I could get them for 3,60 Euro.

Well I have to wait 1-2 weeks and than its going to take 2 more weeks at least till the boards are ready. so I guess if all goes well I can start sending the boards next month.
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Old 17th March 2005, 06:47 AM   #13
jaume is offline jaume  Europe
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Location: Rasquera, a nice village in the mountain and near the sea :)
Count on me for one board plus the most components.
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Old 17th March 2005, 07:08 AM   #14
steenoe is offline steenoe  Denmark
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Just thought I would give you this link on Jfet matching.
Seemingly a delicate operation
Only the 2sk170's needs matching.
The Q-pack contained the transistors and the Zeners.
Also I will just mention that the Pearl boards from Pass, had a groundplane on the entire pcb.


http://www.vacuumstate.com/fet_matching.htm

Steen.
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Old 17th March 2005, 11:05 AM   #15
Buhl is offline Buhl  Denmark
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Default Pearl boards ?

Jaume, I think you would want two boards, as I se it, one boards contaions one channel, so for stereo, you need two boards. I orderd four boards, as Im making a stereo RIAA for my self, and one for a friend.

Promitheus, i assume, that when it is the original gerberfiles used from Pass Labs, the surface would also be groundplane on your boards ?
I didnt know that the 2sk170 needed to be matched !!! - this is a real bugger I think, as it requires some skill - is it something that you could do - against payment of course - so that a complete Qpack could be offerd - with matched transistors (2sk170) ?
Considered the skill needed to match the small fets, I think this groupbuy would have the greatest appeal if a matched Qpack could be offered.

I think the specs on the board looks fine - and the time schedule is also good.

The 10uF I think, is not as vital to offer, as most people use crossover components, witch is available in I think all parts of the small world.
But again, 3,7 Euro (dont you call it "teuro"...? hehe) is cheap.....

cheers

Hans
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Old 17th March 2005, 11:12 AM   #16
jaume is offline jaume  Europe
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Buhl you're right. I need two boards for a stereo pre. Thanks.

From my viewpoint the more components that can be sourced the more interesting will be the kit. Sometimes I've ended paying more in shippments than in goodies.
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Old 17th March 2005, 11:20 AM   #17
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So the q pack was the 2sk389, the 4 2sk170 (matched or unmatched?)
, the IRF610 and then one Zener.
Is that right?

I have a lot of 2sk389 and a lot of 2sk170bl.
I will be making quads for these boards.
I can organize the Qpack. How much did the q pack frm passdiy cost?
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Old 17th March 2005, 11:35 AM   #18
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Promitheus,

I know that you're organizing a Pearl group buy, but I think the Ono is a much better phono stage. If you decide to produce boards for the Ono, I would definately purchase a set (depending on the price, of course!).

Regards,
Ron
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Old 17th March 2005, 11:38 AM   #19
Buhl is offline Buhl  Denmark
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Default Pearl boards

The Qs used in the Pearl (one channel only) is:

- 1 pcs. IRF 9610
- 1 pcs. 2SK389
- 4 pcs. 2SK170Bl - matched in quad
- 5 pcs. ZTX 450 - if this device is not important, another N-chnl. device can be used, eg. 2N2222 ??

I dont know weather the Zener was included, but I have a hard time loacting it, so it would be nice if included.

Is the "BL" extention on the 2SK170 important - some have it, others dont - is it the same device ??

Another thing, my price on the 50V/10000uF is 4,8 Euro for a generic type - no panasonic or another fancy brand - and each RIAA needs at least 8 of the - three on each board, and two in the unregulated supply - that means that I will need a total of 16 of them = 76 Euros...... Do you have a source for those that are cheaper ??
What about the 3300 uF - they are 1,25 euro here, and 8 is needed pr. RIAA, witch means I need a total of 16 of them also.

I dont know what the original Qpack costed, mabye some of the other guys in the forum can remember ??

Cheers !
Hans
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Old 17th March 2005, 11:56 AM   #20
steenoe is offline steenoe  Denmark
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Quote:
- 5 pcs. ZTX 450 - if this device is not important, another N-chnl. device can be used, eg. 2N2222 ??
Here is 2 nice substitutes from Onsemi: MPS6602* and MPSW01A*. If you register and fill up your samples quota you will have plenty of bang for the buck

Quote:
Is the "BL" extention on the 2SK170 important - some have it, others dont - is it the same device ??
You have to use the BL version. The other versions have other values.

Quote:
How much did the q pack frm passdiy cost?
25USD.

Steen
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