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Old 23rd September 2012, 01:25 PM   #491
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I am afraid that 25x25x3mm will be too small, Carl.

Be prepared to use a 40x40x4mm ALU-L profile, the exact length of which is 141 mm.

The transformer that you are going to use, is o.k.

Best regards - Rudi
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Old 23rd September 2012, 02:23 PM   #492
cjkpkg is online now cjkpkg  United States
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I should be able to pick up the correct size at my local home improvement store.

I was afraid it might be too small...oh well...
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Old 23rd September 2012, 06:44 PM   #493
cjkpkg is online now cjkpkg  United States
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OK,

Got the 1.5" L profiles cut and ready to go...just need to drill and tap the holes for the transistors.

Can you confirm the width of the board? I saw 100mm for the TO-3 version, is this board the same size width?

It will be tight but I think everything will fit.
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Old 23rd September 2012, 06:47 PM   #494
AndrewT is offline AndrewT  Scotland
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even 4mm thick for an L profile is a bit on the thin side.
Try for >=5mm and preferably 7 to 8mm thick.
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Old 23rd September 2012, 09:45 PM   #495
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Carl, the size of the AMP-PCB is: 141 x 106 mm.
In my humble opinion / experience your ALU profiles are very well suited.

Best regards - Rudi_Ratlos

Last edited by Rudi_Ratlos; 23rd September 2012 at 09:47 PM.
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Old 23rd September 2012, 09:51 PM   #496
cjkpkg is online now cjkpkg  United States
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Quote:
Originally Posted by Rudi_Ratlos View Post
Carl, the size of the AMP-PCB is: 141 x 106 mm.
In my humble opinion / experience your ALU profiles are very well suited.

Best regards - Rudi_Ratlos
As long as they clear the toroid!!! LOL

I cut the l profiles a little long so I have some flexibility.
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Old 25th September 2012, 10:25 AM   #497
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Hello Rudi,

I received the package yesterday. Many thanks for making this happen. The boards look really great.

cheers, tom
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Old 25th September 2012, 10:53 AM   #498
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Thank you, Tom.
Carl: warm up solder iron!

If you have any questions concerning your build, for example: how to adjust, use of the onboard CAP-multiplier, differences in using the SYMASYM
with or without pre-amplifier, ...: do not hesitate and post your questions here!

I have already begun with my (my brother's) build!

Best regards - Rudi_Ratlos

P.S. There is still 1 SYMASYM - set (see post #483) left!
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Old 25th September 2012, 02:59 PM   #499
mj777 is offline mj777  Philippines
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Quote:
Originally Posted by Rudi_Ratlos View Post
Thank you for the picture, Carl.
This PSU is indeed very versatile and will do a good job for the SYMASYM.

The heatsinks of your case are more than sufficient. Be sure to apply a thin film of thermal grease between the ALU-L profiles and the heatsinks.
May be, there already is - at least on the right side.

Tell me: which transformer will you use?

The ratings of the SYMASYM are: 100W @ 4 Ohm and 60Watt @ 8 Ohm using a transformer with 2 x 27 VAC secondaries / 225W.
If you want to go for higher ratings (f.e. by using a 2 x 30 VAC / 300W transformer): be sure to insert an appropriate ZENER diode
into the onboard-CAP-multiplier to prevent damage to your input transistors (2SK170 f.e.).

Best regards - Rudi_Ratlos
Sir Rudi,

What should be the value of the zener diode if I use 2 x 30 VAC / 300W ?

regards,
Marjohn
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Old 25th September 2012, 04:53 PM   #500
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Marjohn, I would recommend a 36V or 39V Zener diode.

Best regards - Rudi_Ratlos

Last edited by Rudi_Ratlos; 25th September 2012 at 05:03 PM.
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