TSSA V1.7 mosfet Current feedback amp module

[sonnya]

On the picture PEH200MO5470MB2:

I can get them for 82,55€/pcs including VAT.

But rs - online and elfa does have them.

 

[sonnya]

Updated 24-09-14 Buy list

Dane 2 x TSSA V1.7 - Paid - Shipped
Myint67 4 x TSSA V1.7, 2 x CAPBANK for SCREW terminal (28.5mm pitch) - Paid
vgeorge 2 x TSSA V1.7 without mosfets ECW20N/P20-Z + Salas 2 x TSSA V1.7 - Paid - Shipped
buzzforb 2 x TSSA V1.7 - Paid - Shipped
pdb 2 x TSSA V1.7 + 2 capkits - Paid, waiting for chassis.
Michael G and one of his fellows 6 x TSSA V1.7, 1 x softstart. (He already has 2 running) Paid - Shipped
Stajo 2 x BL drive modules, 4 x TSSA V1.7, 2 x BL drive module V1.1 - Paid
Mikelm 2 x TSSA V1.7 - Pending

Prices:

BL drive module V1.1 : 75€/channel

TSSA V1.7 1 - 3 pcs: 100€/channel
TSSA V1.7 4 - 10 pcs: 90€/channel

CAPBANK BARE PCB costs 13€/board
CAPBANK complete assemblied : 137€/unit
CAPBANK complete unassemblied : 111€/unit

CAPBANK for SCREW terminal (28.5mm pitch) types PCB : 68€/board
CAPBANK for SCREW terminal types PCB + 2 x PEH200MO5470MB2 : 207€/set

TSSA Owner or any other SITO Audio product purchase - Toroid 500VA 2x115VAC primary, 2x25VAC secondary : 89€/pcs
Normal buyer - Toroid 500VA 2x115VAC primary, 2x25VAC secondary : 129€/pcs

Softstart inclusive iec inlet, fuse drawer, main switch, illuminated power button: 114€/unit

 

[sonnya]

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

Ready for assembly and test of BL drive module


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[donovas]

wrong posting

 

[sonnya]

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

Rewritten moloco hit... "Do you like my tight pcb?"


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[Mark Verhoeven]

I have some questions:

- What is BL drive module for? Is it for using 2 tssa amp modules in bridged configuration? Does it need seperate power supply?
- Does the power output of those modules double into 4R?
- What power will it do in bridged mode? Low impedance (3R at low frequency) stable?
- How about using SMPS? Any listening experience?

Thanks,

Mark.

 

[sonnya]

I have some questions:



- What is BL drive module for? Is it for using 2 tssa amp modules in bridged configuration? Does it need seperate power supply?

- Does the power output of those modules double into 4R?

- What power will it do in bridged mode? Low impedance (3R at low frequency) stable?

- How about using SMPS? Any listening experience?



Thanks,



Mark.

BL drive is to bridge Any type of AMP module. It works at up to +/-60vdc. The tssa V1.7 works at up to +/-35vdc . So to get higher power levels we needs to run it balanced or bridged.

The BL drive module Runs from the supply of the AMP . All power leads run to the BL drive module and get distributed to the AMP modules.

I will get exact power measurement In BL drive.

In single ended it is close to doubling the power into 4R.

It will be stable In 2R In bridged but the output power will not be doubled when running In 2R.

Smps will not be a problem. Only most smps is for more than 40v so the smps will be custom configuration .. For example audiopower from italy.

Cheaper smps is rather noisy. But we have an lc filter to the AMP to Solve This issue .




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[Mark Verhoeven]

Thanks for the quick response!

I am owning First One amps already, but got curious for your amp while reading this topic. My speakers are quite "power hungry" and dip to 3 ohms impedance @ approx. 3 Ohms. I will wait for the power figures in bridged mode, but I assume it will work well with my speakers.

In bridge mode, will I need higher supply voltage, or just more current?

Mark.

 

[sonnya]

You will just need more current and Maybe run it an a lower voltage like +/-24 to 30vdc.


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[sonnya]

Bad Timing!? TSSA V8....

I forgot.

Onboard current (trip 50A peak) and DC protection.
Still 2 stage design.
No AC coupling caps in the feedback loop -> 100% DC coupled -> Full gain at DC.
Drum roll -> +/-45 - +/-62V supply voltage.

 

[Myint67]

Tssa v8 ?.
New line product ?

 

[sonnya]

The TSSA V8 is an statement module.

But there will be an TSSA V4, and a TSSA V4 BL.

The TSSA V4. will have the double current capacity and the TSSA V4 BL will incorporate the BL drive module. Both will run on +/-35VDC.

The TSSA V4 BL be able to drive 500Watt into 2R.

 

[sonnya]

Hi all.

To stop any confusion. TSSA V1.7 in BL drive will to around 250Watt into 4R. In 2R the output power will be lower. Though it is perfectly stable into even 2R load.

So if you want to double output power in BL drive using +/-35VDC supply voltage, then you have to choose TSSA V4.

The TSSA V4 will also be able to run at up to +/-45VDC (toroid 2x32VAC).

The TSSA V4 will also have lower output impedance compared to TSSA V1.7.

TSSA V4 will also be delivered on a aluminium profile make it easy to assemble.

 

[sonnya]

BL drive V1.1 first measurements.

First we have done some initial measurements.

DC offset with inputs shorted or non shorted:
Positive output: +320uV
Negative output: -199uV

Current consumption: 11mA

Gain measured between positive output and negative output +6dB.

Also look at the FFT measurements. I think they speak for them self.

One thing to be observed. Many designers have to long traces from decoupling capacitor and to V+ and V- on the opamp. This is addressed here ... 2mm at longest distance.

 

[sonnya]

PS: thd+n is no joke or error. There is no difference.

So it would work with any power amp. even SSA frontend with its larger current fluctuation will not be a problem.

 

[sonnya]

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

The test build i am going to make now looks like This . This is one channel capable of delivering at least 140watt into 8R.

It is a sk56 100mm heat sink


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[buzzforb]

Sonny,
What is the Zin of the V1.7?
I am having custom metalwork done for the final cases

 

[Myint67]

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

The test build i am going to make now looks like This . This is one channel capable of delivering at least 140watt into 8R.

It is a sk56 100mm heat sink


140 w 8 ohm class AB mode ?

 

[pinnocchio]

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

The test build i am going to make now looks like This . This is one channel capable of delivering at least 140watt into 8R.

It is a sk56 100mm heat sink


Sent from my iPhone using Tapatalk

Hi Sonnya,

If you don't mind, For better heat dissipation (if the heatsink permits it) I would put the output Mosfets facing the right side of the heatsink (if this is the bottom of the heatsink since heat rises), then rotate de BL drive 180 degrees. This would give ~equal length traces to supply voltage and keep the signal not too far.

Does that make sense?

Thanks
Do

 

[Mark Verhoeven]

The TSSA V8 is an statement module.

But there will be an TSSA V4, and a TSSA V4 BL.

The TSSA V4. will have the double current capacity and the TSSA V4 BL will incorporate the BL drive module. Both will run on +/-35VDC.

The TSSA V4 BL be able to drive 500Watt into 2R.

Who needs TSSA V4 BL with TSSA V8 being available? Can you please explain the advantages of either setup?

Do those amps share sonic signature, or will they be different?

Thanks,

Mark.