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Old 31st August 2011, 09:54 AM   #41
tome is offline tome  Macedonia
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Location: Macedonia
hi Rudi
Please put me on list for foloving boards:
2 - symasym amp boards
4 - psu boards
2 - ls protect boards
2 - soft power - on boards
thanks and regards
tomas
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Old 31st August 2011, 02:22 PM   #42
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Hello Rudi,

please put me on your list for the following boards:
2 SYMASYM Boards
2 PSU PCBs
2 LS protect Boards

best regards
Wolfgang
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Old 31st August 2011, 03:43 PM   #43
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@Curryman

You asked: Will they also run from 2x18V AC?

Michael Bittner's SYMASYM was designed and tested using 25 VAC transformers. He recommends DC values in the range of +/- 35 V and +/- 40 V.

Please refer to this thread, if you want to know more about the SYMASYM:

Explendid amplifier designed by Michael Bittner, our MikeB

Maybe 18 VAC will work. You have to change several things, though, and it may end up being a bad sounding amplifer.

So: my short answer is: NO.

Best regards - Rudi_Ratlos
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Old 31st August 2011, 05:25 PM   #44
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Rudi,
For me also two amp boards
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Old 1st September 2011, 05:57 PM   #45
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Dear TO-3 SYMASYM friends,

tonight I did the 1st power-on on my 2nd channel of my TO-3 - SYMASYM-PCB.

Since my eyes do no more have the capabilities of a hawk, I took my 7 MB digital camera, made a picture of the solder-side of my PCB
and verified that I did a good job.

Click the image to open in full size.

http://www.abload.de/img/joe0142lcl.jpg

This looks quite good!

Then I went downstairs, connected the PCB to my PSU, installed 10 Ohm resistors across the empty fuse-holders, shortened the RCA input, ... and ... powered on.

No smoke?!!

Well: this is what I expected.

Then I turned the trim-potentiometer for the TEMPCO / BIAS - adjustment counter-clockwise, and turned, and turned, ..., nothing happened,
..., and turned and turned - then, all of a sudden: the DMM reads: 1 mV dropping across both TO-3 emitter resistors, 2 mV, 3 mV, ...
the 10 Ohm resistors are about getting very hot, ... - it works!!!

Click the image to open in full size.

http://www.abload.de/img/joe022gaep.jpg

I have documented the procedure how to adjust the quiescent current in my "TO-3 SYMASYM Builder's Manual".

Be sure: this is a very, very outstanding AMP.

Best regards - Rudi_Ratlos

Last edited by Rudi_Ratlos; 1st September 2011 at 06:00 PM.
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Old 3rd September 2011, 01:18 PM   #46
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Join Date: Aug 2011
Hello Rudi,

I've missed your last GB in the AAA so I'm glad to reach another one here.
Please add 7 x TO3-SYMASYM, 7 x PSU and 7 x LSProt - PCBs on your list.

Thanks and regards,

Chris
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Old 3rd September 2011, 01:40 PM   #47
AndrewT is online now AndrewT  Scotland
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Location: Scottish Borders
Monitor the voltage across the Vbe multiplier, as well as Vre.

You will see the Vbe varying instantly in response to turning VR.
Then as Vbe approaches the output bias voltage required you can expect to see Vre starting to take off.

4 soldered in loops, for tapping in test instruments, makes a big difference when developing a new amp.

Why do you still use the remote server to hold our pics?
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regards Andrew T.

Last edited by AndrewT; 3rd September 2011 at 01:43 PM.
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Old 4th September 2011, 01:01 AM   #48
RKH is offline RKH  United States
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Location: Colorado, USA
Hi Rudi,
Do you have an English version of : ""TO-3 SYMASYM Builder's Manual".?

I have the German version, but my German is rusty.

Thanks,
Ryan
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Lighten up while you still can ...
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Old 4th September 2011, 08:58 AM   #49
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Ryan,

please use an "INTERNET translator" (GOOGLE's translator, for example).
Divide the WORD-Document in several chunks first.
It is too big to translate it as a whole.

The result is quite good!

Best regards - Rudi_Ratlos
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Old 4th September 2011, 09:45 AM   #50
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This is an update of the current order:

Click the image to open in full size.

http://www.abload.de/img/image1sppm.jpg

I will close this group-buy as soon as I have received Rudi_SW's order.

I sent Rudi_SW a parcel with quite a number of PCBs, TO-3 transistors, emitter-resistors, ..., some time ago, but his parcel got lost.
I filed a request for investigation then, but DHL cannot tell me, where his parcel has gone.
I am now struggling with DHL to refund the parcel's worth.

I advice everybody to spend some extra and ask for insured shipment.

Due to the fact that I do no more have to pay the tooling costs and due to the quantity of PCBs ordered ,
I will be able to offer you the PCBs for a lower price than given above.

This is the current status of my own build:

Click the image to open in full size.

http://www.abload.de/img/joe0013pmo.jpg

Remember: these are the Version I - PCBs.
The Version II - PCBs (the ones that are offered in this group-buy) have the drivers mounted on the ALU-L profile!

Best regards - Rudi_Ratlos
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