TSSA V1.6 docs and buyers list

[Salas]

Sam that will be Sonny's to answer, I had only used a pair of 2SK1058s & 2SJ162s on easy speakers in a early experimental 175mA bias 50W SSA amp.

 

[Salas]

I have tested it with single 16amp. This will lower the output impedance of about 40% but the gfs is also 4S instead of 2S... This means a doubling of the openloop gain.

We cross posted, sorry. Higher Ciss makes it ''slower'' in that case? And any changes in comp caps necessary? Sounds like an option.

 

[mikelm]

I have tested it with single 16amp. This will lower the output impedance of about 40% but the gfs is also 4S instead of 2S... This means a doubling of the open loop gain.

and how it sound with these ?

p.s. also could explain this "but the gfs is also 4S instead of 2S"

thx

 

[sonnya]

It will give you more control in the bass section in my opinion, but they are also twice as expensive as ECX10N20 and ECX10P20.

upwards i do not see a lot of differences...

But my amp is also running with Z foil resistors all over the place.. 13€/resistors

Well i have only conducted the test myself and my wife have listened too...

 

[mikelm]

you think Z foil is significantly better than Caddock TF020 ?

did get around to try them yet

 

[sonnya]

The noise floor is lower, and TC is 0.2ppm... Does not get better... But i have not tried the TF020.

4Siemens is the transconductance.

2S is 2A at 1V and 4S is 4A at 1V VGS change. -> more gain.

 

[Salas]

Still nicely stable and drivable with no alterations as I understand? Zfoils for the feedback resistors only or VSMPs SMT all over there?

 

[sonnya]

We cross posted, sorry. Higher Ciss makes it ''slower'' in that case? And any changes in comp caps necessary? Sounds like an option.

Yes but in this case i have a driver. So i do not see an increase in distortion in the audible range as frequence increase.

 

[Samuel Jayaraj]

However, I suspect a slight deterioration in midrange and treble nuances both with (i) doubling output devices or (ii) using single double-die devices.

I am not sure about the Exicon parts but with the original Hitachi parts (K1058/J162), the Gate resistors being changed from the usual 100E/200E to 470E and 680E makes a remarkable difference to the balance of the sound. I am not able to recollect which value for which polarity device.

 

[sonnya]

Here there is no gate resistors in the same way as with many designs.

But the is at least 220R in the signal path gate to source and the driver transistor has a re of ~5R + it looks into current generator which is high impedance...

Anyway the is no oscillation visible....

 

[Salas]

Alas, that's an amp version with an extra driver not the V1.6 boards so not for us to try, yes?

 

[Samuel Jayaraj]

Alas, that's an amp version with an extra driver not the V1.6 boards so not for us to try, yes?

No, it won't be an extra driver but an extra output pair OR changing the existing output pair to double die devices, ie., 16 Amp, 250 Watt devices. The unequal Gate resistors are in view of unequal Gate capacitance between and the N and P channel L-Mosfets.

Sonnya, sorry I did not refer to the schematic but assumed that there were Gate resistors like always. Anyway my comments were only to find a way of improving the Bass performance of your excellent amp. As an added bonus, it should cope better with difficult speaker loads.

 

[Salas]

Meaning the existing driver on the standard PCB its good news then, thanks.

 

[mikelm]

It will give you more control in the bass section in my opinion, but they are also twice as expensive as ECX10N20 and ECX10P20.

upwards i do not see a lot of differences...

Well i have only conducted the test myself and my wife have listened too...

Hi Sonny,

I feel inclined to buy the ALF16N & 16P mosfets but can I just confirm that you have actually tried them and they sound good & work well.

thanks

mike

 

[sonnya]

Hi Mike.

Right now i have ECW20N20-Z and ECW20P20-Z in my system. Just have to be a bit more carefull turning up bias.

I have also tested ALF16N16W and ALF16P16W.

You can also use: ALF16N20W and ALF16P20W


But remember to turn R22 CCW 15 turns before power up and after powerup turn it slowly CW until there is 50mV across R30 or R31.

Wait for 10 minutes and adjust for 50mV again. The extra circuit i have built onto the TSSA to get it behaving will slow increase its current until the temperature has stabalized. Tje idle current will fall slowly until the system temperature stabalizes.
It will not make thermal runaway.....

 

[sonnya]

Ok, AMP is gone touring the next 14 days.

 

[Siberia]

There is VT200 Mark I in a good friend's system with Harbeth SHL5s

I would love to hear about TSSA with Harbeths match when you try it.

 

[Charcoal]

Pls, advise what is the:
output Z,
damping factor ?

 

[sonnya]

Output impedance with ECX10P20 and ECX10N20 is 0.55Ohm. => Damping factor at 8Ohm is 14,5

with ECW20N20-Z and ECW20P20-Z , ALF16N16W and ALF16P16W and ALF16N20W and ALF16P20W: Damping factor is 24.

 

[mikelm]

Sonny,

I never use electrolytic caps usually in the signal path or feedback - so don't know anything about choosing a good one - can you recommend a good one from this list ?

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I was thinking Panasonic FC - heard they sound OK ?