VSSA Lateral MosFet Amplifier

[Salas]

Its there where Sonny biases TSSA 1.6 too.

[qusp]

Owen said it did improve slightly at 1A, but at that point it was pure class A and only really capable of pulling 30WPC out of an amp and power supply capable of pretty much matching that performance at nearly 200W... not really a worthwhile trade-off. at 600mA 1khz 2nd harmonic distortion product is -110dB into 8Ω... H3 is ~ -118dB

[mefistofelez]

Hi LazyCat,

would like 4 boards.

Kindest regards,

M

[Tyimo]

What is the default bias level of the "original" VSSA?
How many mA?
And still the old question: how can I adjust it???

[Lazy Cat]

Originally Posted by Tyimo

What is the default bias level of the "original" VSSA?
How many mA?
And still the old question: how can I adjust it???

Optimal output bias current is 160 mA. Other values according to personal taste of the user.

Procedure is simple, first solder 1 k multiturn trimmer potentiometer to R17 pads by the help of 2 cm wire for each trimmer's pin, start with zero ohm setting, trimm bias current to 160 mA, wait for the heatsink to warm up, readjust the trimmer to 160 mA, unsolder the trimmer, measure resistance of the trimmer with digital ohm-meter, use appropriate R17 SMD resistor size 1206 (3216) of the same value as measured, solder the resistor to VSSA PCB.

[Lazy Cat]

So far 126 VSSA PCB requests received. I'll post the ones from open forum (116 pcs), PM requests (10 pcs) will stay discrete. Next week I will send the info to each of you regarding sets (PCB + semiconductors).

Regards, Andrej

Joachim Gerhard 2 PCB set
AKN 2 PCB set
Idefixes 4 PCB set
kimon 2 PCB set
brianco 2 PCB set
Dane 2 PCB set
MKHunt 2 PCB set
Cambe 2 PCB set
Supernet 2 PCB set
boyet0173 2 PCB set
tom42107 2 PCB set
presbel 2 PCB set
meltman 2 PCB set
gannaji 2 PCB set
dodo 2 PCB set
coolet 2 PCB set
jj506 2 PCB set
vgeorge 2 PCB set
touchdown 2 PCB set
wponline 2 PCB set
Luke 2 PCB set
cvtaudio 10 PCB set
Renio 2 PCB set
maillard 2 PCB set
PauloPT 2 PCB set
hcbonfim 2 PCB set
gusto142 2 PCB set
PinkPink 2 PCB set
dine1967 2 PCB set
bressix 2 PCB set
nico2k3 2 PCB set
routhun 2 PCB set
CaféNoir 2 PCB set
ColinAlex 8 PCB set
Murdoc 2 PCB set
regal 2 PCB set
AUSTINP 2 PCB set
kroyin 2 PCB set
fredlock 2 PCB set
mikvous 2 PCB set
myfi 2 PCB set
FelixG 4 PCB set
ichiban 2 PCB set
padamiecki 2 PCB set
gogu 2 PCB set
joshvi 2 PCB set
philippeleite 2 PCB set
mefistofelez 4 PCB set

Thanks a lot guys.

[regal]

Thanks for including the semi's they seem difficult to obtain.

[DavorXXL]

Hi LC,
count me in for 6 PCB set

[sakdi]

Count me in for a stereo pair.

Best regards.

[buzzforb]

Regards, Andrej

Joachim Gerhard 2 PCB set
AKN 2 PCB set
Idefixes 4 PCB set
kimon 2 PCB set
brianco 2 PCB set
Dane 2 PCB set
MKHunt 2 PCB set
Cambe 2 PCB set
Supernet 2 PCB set
boyet0173 2 PCB set
tom42107 2 PCB set
presbel 2 PCB set
meltman 2 PCB set
gannaji 2 PCB set
dodo 2 PCB set
coolet 2 PCB set
jj506 2 PCB set
vgeorge 2 PCB set
touchdown 2 PCB set
wponline 2 PCB set
Luke 2 PCB set
cvtaudio 10 PCB set
Renio 2 PCB set
maillard 2 PCB set
PauloPT 2 PCB set
hcbonfim 2 PCB set
gusto142 2 PCB set
PinkPink 2 PCB set
dine1967 2 PCB set
bressix 2 PCB set
nico2k3 2 PCB set
routhun 2 PCB set
CaféNoir 2 PCB set
ColinAlex 8 PCB set
Murdoc 2 PCB set
regal 2 PCB set
AUSTINP 2 PCB set
kroyin 2 PCB set
fredlock 2 PCB set
mikvous 2 PCB set
myfi 2 PCB set
FelixG 4 PCB set
ichiban 2 PCB set
padamiecki 2 PCB set
gogu 2 PCB set
joshvi 2 PCB set
philippeleite 2 PCB set
mefistofelez 4 PCB set
buzzforb 2 PCB set