TO-3 SYMASYM

[Gluttony]

Hi Srinath,

paypal is just saying, if you don't have an account, you can pay with your credit card.

If you have problems with ordering, you can send me a mail (info at diy-audio-shop.de) and I will do the ordering for you.

 

[srinath]

Also if I ran MJ21103 and 21194 transistors, what voltage do I have to supply, and what VA would be needed for getting the best output from them ?
Thanks.
Srinath.

 

[srinath]

Email coming.

Hi Srinath,

paypal is just saying, if you don't have an account, you can pay with your credit card.

If you have problems with ordering, you can send me a mail (info at diy-audio-shop.de) and I will do the ordering for you.

I have paypal - why is it giving me that error instead of launching paypal ?
I'll email you, or you can invoice me - seshadri_srinath@hotmail.com.

Also what is the input voltage needed and recommended VA for the 21193/21194 combo.

Thanks.
Srinath.

 

[gwrskien]

It means something like this:
Pay with paypal. If you dont have PP, you can also pay with your credit card.

I had a look.. and i think you fill in your name and address and so on in the "zur kasse", hook the two bokses at the end for "acsepting payment and delivery terms". And then it takes you to PP where you can pay i think.. Hope this helps some..

 

[srinath]

+/- 65V will work ?

About 500VA minimum ? Need more ???

Thanks.
Srinath.

 

[Rudi_Ratlos]

Srinath, the recommended voltages are +/-35VDC.
A 4x25 VAC / 300-400VA will do it.
The MJ2119x transistors are TO3-case - transistors and are not suitable for the PCB.
The PCB accepts TO3-P and TO264 case transistors (for example: NJW0, small Sankens, MJL2119x, ...).

Best regards - Rudi_Ratlos

 

[cumbb]

I would not build a symasym. It does sound not much better, not much cleaner than a big Accu or Krell or other "complementary-parts-multi-stage-pp". It is a terrible design, on terrible boards, with terrible psus.
I suggest: Invest in little quasi-complementary amps or, better, in se.
My mind.

 

[srinath]

I am trying to build a Pioneer sx1250 clone, I have a few of the transistors around.
I'll see if I can find a dead 1250.
Problem is, I only like the power amp section of the 1250.
Cool.
Srinath.

 

[cumbb]

I would prefer a sx 424, as example. Sounds much much better, cleaner than a sx 1250,-)
And a little tuning ...-)))

 

[atupi]

Too much off topic gents !

Sent from my Nexus 5 using Tapatalk

 

[Symcendo]

Hi folks,

I'm about to build some Symasym´s using the black PCB´s layouted by Rudi. Now I need to place some orders and for this I need to know which wire size is recommended for the coil around the resistor. Is it 1.0mm or 0.6mm? How much windings?
I'll use MJL1302A / MJL3182A / MJE15030 / MJE15031 and 2SK170 if this is relevant.
What´s about the condensers C10 and C11? Can they be replaced with some ceramic types?

Thanks for your support!
Markus

 

[AndrewT]

Use at least 1mm diam.
I tend to use 1.4mmm or bigger and recently used 2.1mm diam enameled copper wire.
Still wound around an AA battery with short tails
Do not use 0.6mm diam wire.

 

[Symcendo]

Thanks for the information, Andrew.

 

[Symcendo]

Hi folks,

today I finished the first amp as far as I could. Now I've to wait for the heat sinks and transformers. Next step then is to mount the transistors to the heatsink. For this I made a pdf showing the pcb with hole pattern.

The coil is made from 1.0mm enameled copper wire, 12 windings and a 3.9 Ohm resistor (2 watts).

I already soldered the speaker protection except the rectifier and zener diode, so there will be no power to the speaker protection during testing and adjusting.

End caps are already done, it should be no problem to solder the transistors afterwards.

 

[Rudi_Ratlos]

Markus: I have attached the drill-template.
I am sure that you have soldered the "SmallSignalGND" - wire.

Best regards - Rudi

 

[Symcendo]

Rudi: of course, the small wire is soldered as needed. Thank you for the drill template.

Is there any reason why the speaker protection should be soldered after testing and adjusting?

greets - Markus

 

[Rudi_Ratlos]

The reason: if you cannot get the SYMASYM up and running, you have wasted time and money, if you have already soldered the speaker-protection !

Regards - Rudi

 

[hambone]

Hey Rudi,
do you have anymore of these pcbs and if so, how much?
thanks

 

[Bertl17]

2 PCBs, Transformer and several parts to sell

Hello,
due to lack of time I would like to sell the follwing items:

2 PCB Sysmasym (Blackbeauty) by Rudi_Ratlos
1 Transformer 230V / 4 x 25V/400VA (from Badel)
4 Heatsink V PR32/25,4
4 Cap 10.000uF/50V
2 Relais FTR K1CK024W
8 MUR 820 Ultrafast Diode
8 Cap 1000uF/50V

All parts are new and unused - see picture. Price for all items would be 110EUR plus shipping costs (from Germany).

If someone is interested in buying these items, please send me a PM.

Thanks

 

[Bertl17]

PCBs and Parts aren't available anymore. Thanks.