Lowering the output impdance of the TSSA V1.6

sonnya · 5th June 2013, 10:44 PM

If it is required get more grip of the speaker, the following can be done:

Make the Errata note with 470R between Q13 and Q14 and between Q12 and Q15
R7 and R8 changed to 2K
change R22to 500R.
Do a new trim.

Trim to 500mA idle. As this gives the best distortion.

Distortion into 4W 8R is now 0.068% into 1KHz instead of 0.137%

Zout is now 0.28Ohm instead of 0.35Ohm.

The peak idle current at start up rises to 1Amp shortly for a few seconds. After 5 min it has settled to 500mA.

sonnya · 5th June 2013, 11:02 PM

It works well with R7 and R8 as 5.6k also giving even lower distortion and Zout.

Zout : 0.112Ohm
Distortion into 4W 8R is now 0.04%

Siberia · 8th June 2013, 10:05 PM

If R7 & R8 is changed to 5.6K, does R22 has to be 500R?

pdb · 18th June 2014, 07:07 PM

Great news

Sonnya has put vers. 1.7 up for sale at Vendors Bazaar http://www.diyaudio.com/forums/vendo...mp-module.html

5th June 2013, 10:44 PM	#1
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	Lowering the output impdance of the TSSA V1.6 If it is required get more grip of the speaker, the following can be done: Make the Errata note with 470R between Q13 and Q14 and between Q12 and Q15 R7 and R8 changed to 2K change R22to 500R. Do a new trim. Trim to 500mA idle. As this gives the best distortion. Distortion into 4W 8R is now 0.068% into 1KHz instead of 0.137% Zout is now 0.28Ohm instead of 0.35Ohm. The peak idle current at start up rises to 1Amp shortly for a few seconds. After 5 min it has settled to 500mA.

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5th June 2013, 11:02 PM	#2
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	It works well with R7 and R8 as 5.6k also giving even lower distortion and Zout. Zout : 0.112Ohm Distortion into 4W 8R is now 0.04%

8th June 2013, 10:05 PM	#3
Siberia diyAudio Member Join Date: Feb 2011 Location: Vilnius	If R7 & R8 is changed to 5.6K, does R22 has to be 500R?

18th June 2014, 07:07 PM	#4
pdb diyAudio Member Join Date: Feb 2007 Location: Bornholm	Great news Sonnya has put vers. 1.7 up for sale at Vendors Bazaar http://www.diyaudio.com/forums/vendo...mp-module.html