TSSA V1.7 mosfet Current feedback amp module

[sonnya]

Hi, I have added all the relevant measurements below + plots.

Supply voltage : +/-24VDC <-> +/-35VDC
Bandwidth : 1,4Hz <-> 1.5MHz
Slewrate : 53V/us
Zin : 10KOhm.
Zout : 71mOhm.
Peakcurrent continous out : 12.3Apeak

As you can see the clipping into 1,8Ohm is soft.

 

[sonnya]

And distortion measurements.

 

[buzzforb]

Those look really good. High order stuff does creep up at 25W, but that is only at .25A bias. I would expect this to improve somewhat at higher bias. Then again, most listen at an output level below this power rating.

 

[sonnya]

For comparison i have attached distortion from the old TSSA (Simelar to all TSSA variants )

 

[buzzforb]

Safe to say you bested its measured performance. Cant wait to listen.

 

[sonnya]

If everything goes good with the sale Kristian and I have something similar to this Jeff Rowland preamp in mind for the DIY community.

Our plan is to supply the community with an preamp design which go hand in hand with the softstart and our amp modules to make it possible to make your own integrated amp or just an preamp.

We will supply the following:

• Milled frontpanel
• TFT 2.4" 262144 color 320x240 pixel high brightness/contrast display
• discrete and timeless graphics. Easy to read from distance
• IR interface for universal remote
• Backpanel with preamp integrated balanced as well as unbalanced inputs
• Preamp will be same quality as the rest of our products.
• Digital frontpanel feed by the softstart +5V out. (Connector J1)

We are curious to hear if this has any interest.

 

[buzzforb]

I would be interested, but might be first of year type thing.

 

[sonnya]

Some simulation on the BL drive unit.

First stage has no global feedback.

Second stage - buffer driving amplifier has feedback but in inverted mode with x2 times gain.

Thd is 0.006% from input receiver without global feedback.

 

[buzzforb]

discrete or op amp based?

 

[sonnya]

Discrete


Sent from my iPhone using Tapatalk

 

[buzzforb]

now I am even more excited.

 

[sonnya]

BL drive rev 1.1:

Data:
Zin : 10K - 100K on request
Zout : 39mOhm
Bandwidth : DC - 1.3MHz
Distortion into 1K @ 5.6Vrms @ 1KHz : 0.001248%
Distortion into 1K @ 5.6Vrms @ 100KHz : 0.006969%
See attached distortion plot.

Features:
First stage:
2 x Diamond buffer enhanced with CFP driving in bridged balanced mode.
currentmirror driving discrete inverted opamp.
No global feedback in the first stage

Second stage:
2 x discrete CFB opamp in inverted mode driving each amp.
Uses virtual GND from amp modules reducing ground loops.
drives down to 100R load.
Short global feedback loop.
Compensated to drive capacitive loads.

Tomorrow i will email schematic to those who have committed to buy the BL drive module. (Buzzforb is an exception - I will mail you to)

 

[pinnocchio]

Hi Sonnya,

If I buy to amp modules, can I buy it with top parts included but not soldered? Reason I'm asking is that I would maybe add some of my own preferred components.

Also, did you get a chance to compare it with Lazy Cat FO?

Thanks
Do

 

[sonnya]

Hi Sonnya,

If I buy to amp modules, can I buy it with top parts included but not soldered? Reason I'm asking is that I would maybe add some of my own preferred components.

Also, did you get a chance to compare it with Lazy Cat FO?

Thanks
Do

Yes, you just have to specify it in the order. But we cannot test the boards, just that you know it.

No i have not had an opportunity to compare it with Lazy Cat's first one.

But i will send an sample to Joachim Gerhard. I think he has the first one.

- Sonny

 

[pinnocchio]

Actually, I do have the FO but I'm waiting for the SMPS to arrive. I also have 4x VSSA v1.4, AMB B24 and a ton of other amps. I will be more than happy to give you a résumé if you want to?

That said, I'm really interested in your project

Thanks
Do

 

[sonnya]

Buy list

Dane 2 x TSSA V1.7 - Paid
Myint67 2 x BL drive modules, 2 x TSSA V1.7, 1 x softstart
vgeorge 2 x TSSA V1.7 without mosfets ECW20N/P20-Z + Salas 2 x TSSA V1.7 - Paid
buzzforb 2 x TSSA V1.7 - Paid
pdb 2 x TSSA V1.7 + 2 capkits
Michael G and on of his fellows 6 x TSSA V1.7, 1 x softstart. (He already has 2 running)
Stajo 2 x BL drive modules, 4 x TSSA V1.7, 1 x softstart.

Prices:

BL drive module: 84€/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
Softstart inclusive iec inlet, fuse drawer, main switch, illuminated power button: 114€/unit

 

[sonnya]

Description and video demo of softstart modul

Hi All.

I have upload two videos on youtube.

And also added documents on the softstart.

Description of Softstart module - Youtube

Demo of Softstart module - Youtube

 

[buzzforb]

Actually, I do have the FO but I'm waiting for the SMPS to arrive. I also have 4x VSSA v1.4, AMB B24 and a ton of other amps. I will be more than happy to give you a résumé if you want to?

That said, I'm really interested in your project

Thanks
Do

You will happily set those amps to the side after hearing this one, IMO, of course.

 

[sonnya]

I wanted to show how easy it is to adjust the TSSA V1.7 and how stable it is.

This Video is ~7min long

MIRAND Audio TSSA V1.7 trim demo

I hope it make confidence how stable it is.

 

[pinnocchio]

Hi Sonnya,

I'm quite a fan of dual mono setup but wanted to know your take using a single of your PSUs with two amp modules? Do you prefer using dual mono or shared supply? Your PSU seems really nice with those BHC caps.

Thanks
Do