Lowering the output impdance of the TSSA V1.6 - diyAudio
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Old 5th June 2013, 10:44 PM   #1
sonnya is online now sonnya  Denmark
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Default 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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Old 5th June 2013, 11:02 PM   #2
sonnya is online now sonnya  Denmark
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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%
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Old 8th June 2013, 10:05 PM   #3
Siberia is offline Siberia  Lithuania
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If R7 & R8 is changed to 5.6K, does R22 has to be 500R?
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Old 18th June 2014, 07:07 PM   #4
pdb is offline pdb  Denmark
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Great news Sonnya has put vers. 1.7 up for sale at Vendors Bazaar TSSA V1.7 mosfet Current feedback amp module
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