TSSA V1.7 mosfet Current feedback amp module

[sonnya]

You are all just right about it.


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[sonnya]

The type of cap we use is RR70J102MDN1 from Nichicon.

It was on purpose that i was selecting the transfer diagram from the datasheet.

But they have an ESR of 7mOhm, and an ripple current of whooping 6.1Arms.

The pin pitch matches my layout.

 

[pinnocchio]

Hi Sonny,

Last Sunday, here in Montréal we had a DiY day and I decided to bring the TSSA with me. It was connected to a pair of Onken 95dB speakers and some Tad TD-2001 mounted on wooden horns. The source was a Hi-Res music server based on Volumio 1.55 and Pi 2 on AK-4490 DAC. It sounded delightful!

Ciao!
Do

 

[sonnya]

Hi Sonny,

Last Sunday, here in Montréal we had a DiY day and I decided to bring the TSSA with me. It was connected to a pair of Onken 95dB speakers and some Tad TD-2001 mounted on wooden horns. The source was a Hi-Res music server based on Volumio 1.55 and Pi 2 on AK-4490 DAC. It sounded delightful!

Ciao!
Do

Looks like a nice DIY day. I have just seen the pictures from the DIY Day 2015

 

[sonnya]

Hi Sonny,

Last Sunday, here in Montréal we had a DiY day and I decided to bring the TSSA with me. It was connected to a pair of Onken 95dB speakers and some Tad TD-2001 mounted on wooden horns. The source was a Hi-Res music server based on Volumio 1.55 and Pi 2 on AK-4490 DAC. It sounded delightful!

Ciao!
Do

I have read you thread about the DIY day.

The problem is that you have on the ATS is due to the use of the Lateral Mosfet. I have come to the conclusion that the Lateral mosfet do the thermal limit them self. Therefore they also limit the maximum available current they can deliver. My amp runs on +/-36Vdc rails. if you go for an higher supply voltage the current they can deliver gets lower. They can deliver 16A but it is most likely when they are cooled down to 25 degrees celcius.....
So the better cooling you can give them, the more current they can deliver.... Due to the positive temperature coefficient

 

[sonnya]

That is why i go for more output devices

The TSSA V4 will have 4 pairs instead of 2 pairs and the TSSA V8 will have 8 pairs instead of 4 pairs as originally planed.

 

[pinnocchio]

I have read you thread about the DIY day.

The problem is that you have on the ATS is due to the use of the Lateral Mosfet. I have come to the conclusion that the Lateral mosfet do the thermal limit them self. Therefore they also limit the maximum available current they can deliver. My amp runs on +/-36Vdc rails. if you go for an higher supply voltage the current they can deliver gets lower. They can deliver 16A but it is most likely when they are cooled down to 25 degrees celcius.....
So the better cooling you can give them, the more current they can deliver.... Due to the positive temperature coefficient

But the ATS were not tested on the TSSA, only tested with the Onken, which played beautifully. The problem happened with another amp on ATS speakers.

Looking forward to V4 and V8

Ciao!
Do

 

[sonnya]

The other AMP uses semelab which is identical to the exicons i use[emoji1]


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[sonnya]

BTW i would like to have onken speaker , but i do not know how to tell my wife.. Ha ha ha hahhhhh whhhaaaa


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[sonnya]

By the Way Dominic .. I have not come to assemble the dac yet. [emoji19] we have so much Work from all sides ... Hopefully we will do it the next week.


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[pdb]

I understand that TSSA has fewer stages and less gain than an ordinary amp. But what is actually a TSSA and what are the pros and cons of this configuration / layout - technically and in terms of sound quality?

 

[pinnocchio]

The other AMP uses semelab which is identical to the exicons i use[emoji1]


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ah! I see!

Thanks
Do

 

[pinnocchio]

BTW i would like to have onken speaker , but i do not know how to tell my wife.. Ha ha ha hahhhhh whhhaaaa


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Just don't tell her...

 

[Siberia]

I have read you thread about the DIY day.

The problem is that you have on the ATS is due to the use of the Lateral Mosfet. I have come to the conclusion that the Lateral mosfet do the thermal limit them self. Therefore they also limit the maximum available current they can deliver. My amp runs on +/-36Vdc rails. if you go for an higher supply voltage the current they can deliver gets lower. They can deliver 16A but it is most likely when they are cooled down to 25 degrees celcius.....
So the better cooling you can give them, the more current they can deliver.... Due to the positive temperature coefficient

Hello, Sonny

Do these findings somewhow influence the way we should bias our amps?
I'm with v1.6, and I do bias it near 800mA when warm.

 

[sonnya]

With version 1.6 it is an nogo to adjust the current down.. Sorry


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[Siberia]

Sorry? You must be sorry that this amp brings me down to tears sometimes. Installed it in my new home. Now the system hosts a more intimate room. Sounds even more gorgeous.

 

[sonnya]

An externally hosted image should be here but it was not working when we last tested it.

New tssa ready boards for testing the nichicon FP caps.

Vgeorge is also receiving caps. He will also post what he thinks of them.


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[Siberia]

I've made a wish and my Jinn heard me.

 

[sonnya]

Hi Just some progress here.

In the future all new amps will be mounted on an baseplate.

So the TSSA V4 and TSSA V8 will share the same baseplate. 170x70mm 5mm thick.

For the TSSA V2SE the baseplate will be 80x70mm 5mm thick.

All mountingholes are 5mm for 4mm screws.

This should make it easier to mount them on an heatsink as there is only 5 mountingholes on the big plate and 4 and small one.

Only things necessary is thermal grease.

For the curious ones. The TSSA V2 SE is meant as an stepup in performance compared to the TSSA V1.7 / V1.8.

TSSA V1.8 will not be discontinued!

But if you want to go for the best of the best parts then the TSSA V2 SE should be the choice. it will have 50% more current capability. Resistors will be thin film all over the place and Capacitors the best we can get.

Feedback resistors will be Y11691K00000T9R and Y116950R0000B9R which is Vishay Metal foil types, type SMR3D. if you google the price of the metal foil resistors you will see that they cost 60€ per channel alone for 4 resistors.

The base plate is ordered, but we will do the TSSA V4 and V8 first. Only if thing turns out differently the order will be changed.

 

[buzzforb]

Sonnya,
Can you give a quick rundown between the V2SE and V4 in terms of numbers. I had planned on going to V4, but unsure what the V2SE is.