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Old 10th January 2012, 05:11 AM   #201
RKH is offline RKH  United States
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Rudi,
I have sent you euros via paypal.

Ryan
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Lighten up while you still can ...
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Old 10th January 2012, 09:23 AM   #202
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Hi Rudi ,

Money sent via paypal.(48 euro +2 euro)

Regards,
Vitali
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Old 10th January 2012, 09:42 AM   #203
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Gentlemen, thank you very much.

Click the image to open in full size.

http://www.abload.de/img/10.01b8a25.png

Best regards - Rudi_Ratlos
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Old 10th January 2012, 06:29 PM   #204
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Gentlemen,

I am very proud to offer you 4 pairs of matched NJW0281G / NJW302G.

Click the image to open in full size.

http://www.abload.de/img/joe012t6joq.jpg

They have been matched by my Canadian friend Joseph, they have a very small internal capacitance
(COB of 400pf only - the MJE drivers will love them),
they are absolutely new and authentic OnSemi - and they will fit perfectly into your SYMASYM PCB.

I will offer you these 8 transistors for 24€.

The first, who says that he wants to have them, gets them.

Best regards - Rudi_Ratlos
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Old 11th January 2012, 04:08 PM   #205
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Gentlemen,

I am quite surprised that nobody of you showed interest in my offer of 4 pairs of matched NJW0302/NJW0281 transistors for the SYMASYM so far.

This is part of the NJW0 - specifications:

Features
•Exceptional Safe Operating Area
•NPN/PNP Gain Matching within 10% from 50 mA to 3 A
•Excellent Gain Linearity
•High BVCEO
•High Frequency
•These are Pb-Free Devices

So: any pair of NJW0 - transistors that you buy is Hfe-matched within 10% by fabrication process.
The ones that I offer you are matched within <<5%.
You can even substitute the emitter resistors by 0R1 - types: you will only hear 1 (!) transistor playing,
being able to dissipate a total power of 300 Watts.

And yes: there is a noticeable, audible difference between output transistors with a Cob of 650pF (f.e. MJL4xxx; the drivers have to
unload this capacitance during each swing) and the NJW0 - type, which has a Cob of 400pF only.

It is your choice, gentlemen, which output transistors you will use.
I do not recommend you to use Toshiba 2SC / 2SA, since the Toshibas have a tendency to oscillate using the underlying
version 5.3 schematics of the SYMASYM (see PAVELs page: symasym).

Best regards - Rudi_Ratlos
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Old 11th January 2012, 05:19 PM   #206
StevieK is offline StevieK  Germany
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Hello Rudi,
I will take the Transistors.

best wishes,
StevieK
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Old 11th January 2012, 05:36 PM   #207
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You have them, Stevie.

Best regards - Rudi_Ratlos
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Old 12th January 2012, 04:51 AM   #208
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Hi Rudi, for me please

2x TO-264 SYMASYM PCB - the price is 8.50 per PCB
2x Speaker Protection PCB - the price is 5 per PCB
2x PSU PCB - the price is 9 (this new (!) PSU PCB will accommodate caps with a diameter of 35 mm)
2 Sets Emitter-resistors - the price is 2.50 for 4 Futaba MPC74 0R22 resistors
4 Pairs Output-transistors - the price is 9 for 2 pairs of NJW0281 / NJW0302
2x Input-Cap - the price is 3 for one Vishay MKT1822

Thanks
Claus1968
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Old 13th January 2012, 05:10 PM   #209
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Gentlemen,

this group-buy is closed now.

This is the final order-EXCEL-sheet:

Click the image to open in full size.

http://www.abload.de/img/image10y5xm.png

I already ordered the input caps and emitter-resistors.

Regarding the PCBs:

Most of you know already, that the lead time for the PCB order is 12 days.
This time it will take one week longer.

The chinese etching company writes:

We will have Chinese Spring Festival holiday from Jan 22 to Jan 28, 2012.

I think it will take a least 3 weeks, until the PCBs will be etched.
I will inform you about the progress.

In one of the next days I will send to those of you, who do not yet have, the TO264-SYMASYM Builder's Manual.
Inside you find the schematics, instructions how to build, how to adjust the quiescent current, the BoM,...

Best regards - Rudi_Ratlos
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Old 17th January 2012, 07:17 PM   #210
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This is the 1st picture of the DX PSU - Rev.2 - PCB that METAL and I will offer in this group-buy.

Click the image to open in full size.

http://www.abload.de/img/psu9srjt.png

My German DIY-friends tend to forget the power-dissipation of the rectifier-diodes, when they drive their SYMASYM
from one > 300 Watt transformer and one PSU-PCB (due to space limitations).

We therefore provided room for a big heatsink for the rectifier diodes.
The reservoir capacitors can have a diameter up to 35mm, clipped in with 10mm grid.

Best regards - Rudi_Ratlos
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