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CAL Sigma 2 Tube DAC modifications

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CAL Sigma 2 Tube DAC modifications

Post by timurmusicfan on Fri Jan 29, 2016 10:04 am

Greetings to all the Sifus and DIYers out there,
I am thinking of doing some mods/upgrade of my 10 year old DAC. I really like the sound (and it matches the rest of my system).
Anyone has some experience with this one?
Surfing the net, I only found a single DIY mode. That is how to improve the casing...not the electronics.
Thanks in advance for any suggestions.
Muhsin

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Re: CAL Sigma 2 Tube DAC modifications

Post by vt4c on Fri Jan 29, 2016 8:42 pm

No sifu here...
 
  Some recommendations....

1.) You may do some tube rolling on the 12AX7 it uses.
2.) Change the output coupling caps to some FT-3 Russian Teflon caps.
3.) Since it's 10 years now, changing all the electrolytic caps might be a good idea.


Last edited by vt4c on Fri Jan 29, 2016 10:20 pm; edited 1 time in total
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Tube rolling

Post by timurmusicfan on Fri Jan 29, 2016 9:08 pm

Thank you for quick reply and suggestions. 
I have tried a few tubes and found the vintage Telefunken 12ax7 and new Sovtek 12ax7wxt+ the best. 
Will try the coupling caps next. 
Cheerio,
Muhsin

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Re: CAL Sigma 2 Tube DAC modifications

Post by RoyStukel on Sat Feb 27, 2016 4:20 pm

As per my experience you must use the tube rolling on the 12AX7.
Also try by changing the output coupling caps to some FT-3 Russian Teflon caps.
As per my knowledge changing all the electrolytic caps might be a good idea.

http://www.7pcb.co.uk

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