TSSA V1.7 mosfet Current feedback amp module - diyAudio
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Old 7th June 2014, 11:05 AM   #1
sonnya is offline sonnya  Denmark
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Default TSSA V1.7 mosfet Current feedback amp module

Hi all.

We have had the TSSA V1.7 running for 4 month in 2 amps without any issues. So it is now ready for production.

The first module can be shipped the 25. june 2014. The first batch will be of 50 modules (25 stereo sets).

On the release date there will be made an front-end ready to use the modules in bridged configuration for users with single ended sources who wants more power. This front-end will be all discrete solution - No opamps!

TSSA V1.7 will be priced at :

1 - 3 modules 100/module.
4 - 10 modules 90/module.

Add shipping to this price.

Key data on the module is:

1) 2x40W into 8R in SE configuration.
2) Power supply 2x32VDC - 2x35VDC
3) can be run in class AB as well as CLASS A up to 1 - 2 amp depending on heatsink used.
4) Bandwidth of 1.3MHz.
5) Two layer board gold-plated with 70um copper.
6) 2x 250Watt mosfet
7) Ultra stable offset of +/-1mV drift without the use of Servo
8) We have added LC filter on the supply to reject ripple noise from SMPS. The LC filter reduces the cross-talk between the modules across the powersupply. Because of the integrated LC filter the amp is very forgiven on the quality of the power supply.
9) Output impedance is below 50mOhm.

The Main difference on the TSSA V1.6 and TSSA V1.7 is the more "advanced" current generators which makes it possible to raise the gain by 15 times.

For those who knows the TSSA V1.6 the upgrade will mean even more detail especially in the mids and high, better nuance in the bass region. Darker background.

Some of my danish customers says it is the best they have heard.

Better than Gamut D200I, Pass Labs XA30, Belles SA-100.
Attached Images
File Type: jpg TSSA V1.7 on test heatsink.JPG (550.3 KB, 756 views)
File Type: jpg tssa v1.7.JPG (57.7 KB, 715 views)
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Old 7th June 2014, 05:24 PM   #2
sonnya is offline sonnya  Denmark
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Some of you have asked about what power supply i use:

I use Farnell multicomp mcfe500-25 for low mechanical hum together with the module shown here. Is has fast recovery diodes and 60.000uF long life low impedance capacitor from BHC aerovox. You do not get better capacitor than them (except RIFA/KEMET)

I will calculate a price for this module
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File Type: jpg IMG_1002a.jpg (484.0 KB, 662 views)
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Old 7th June 2014, 06:52 PM   #3
sonnya is offline sonnya  Denmark
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CAPBANK BARE PCB costs 13€ + shipping.

CAPBANK complete assemblied : 137€ + shipping.

CAPBANK complete unassemblied : 111€ + shipping.

The diodes used in the single bridge configuration is: FAIRCHILD SEMICONDUCTOR - FFP30S60STU - DIODE, RECTIFIER, 600V, 30A Softrecovery for minimum switching noise.
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Old 7th June 2014, 07:14 PM   #4
sonnya is offline sonnya  Denmark
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The singleended to bridge configuration module based on my Diamond frontend with jfet will cost 60 - 70€/channel and can be used with any amp you wish to bridge.

As said it is completely discrete buildup.
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Old 11th June 2014, 03:30 PM   #5
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Wow - looks really interesting. Your design came to my knowledge only a couple of days ago when I accidently strolled the frontpage of diyaudio... Sounds very promising indeed. Keep it up. All the best, Per
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Old 11th June 2014, 05:09 PM   #6
sonnya is offline sonnya  Denmark
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So you live on Bornholm . If you pass Odense some time you Can listen to them.

A friend of mine (Michael G on http://www.hifigalleri.dk ) says it is the most silent AMP he come across.


Sent from my iPhone using Tapatalk
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Old 18th June 2014, 10:03 AM   #7
sonnya is offline sonnya  Denmark
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The buyers list:

vgeorge 4 (2 without mosfets ECW20N/P20-Z, 2 full)
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Old 18th June 2014, 10:36 AM   #8
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Hum Level measured to be -91dBu at 50Hz in a real amp build.

Se PDF attached.

That means 0.021831mVrms or 59pW into 8R.
Attached Files
File Type: pdf TSSA V1.7 hum level at 50Hz, input shorted.pdf (75.7 KB, 43 views)
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Old 18th June 2014, 10:52 AM   #9
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13.88Vrms into 7R load. => 27Watt -> THD : 0.065%

Zout is 56mOhm.
Attached Files
File Type: pdf 1KHz 27Watt into 7R.pdf (79.5 KB, 28 views)
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Old 18th June 2014, 10:57 AM   #10
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1W into 8R at 1KHz -> THD : 0.016%
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File Type: pdf 1W into 8R 1KHz..pdf (78.9 KB, 23 views)
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