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VSSA Lateral MosFet Amplifier

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C

chunek

Member
Joined 2010
Lazy Cat said:
Hi chunek
Maybe I missed, what speakers you are driving with VSSA and what are your's sound impressions, if you have a minute?
Regards, LC :)
Click to expand...

I am currently using it with 4 ohms KEF speakers. The setup is with +-45V connex SMPS. My first impression while I turn on the amp is silence, only with blue LED light up on face plate. Sound wise is slightly lack of weight or density as compare to Honey badge (I use the trick from a friend at post 1951 to enhance this, saw HYPEX also do similarly), but it is fast and with lot of details. Mid range is beautiful and lower end is bouncy. Only mid high to high is not extended smoothly. Good news is this problem is less and less visible after more and more burn in. Overall performance are warm, details, silence and musical.

Thanks for creating this simple masterpiece! :worship::D


James:)
 
Lazy Cat

Lazy Cat

Member
Joined 2007
momomo67890 said:
for the new group buy are r19/r20 going to be the correct resistor or the same as first gb
Click to expand...
All VSSA modules already sealed in plastic bags, preventing to not oxidize, meaning that they were all assembled in June, together with the rest already sent. Only ALF mosfets to be added when arrive. Today I spoken again with Semelab and they confirmed delivery in August.

R19, R20 are not problematic with standard linear PSU, problem can appear at instant rails voltage rise from zero to max in msec as by Hypex. Up to now only two resistors failure reported, all in connection with Hypex SMPS400 PSU.
 
Nikitas

Nikitas

Member
Joined 2011
BYRTT 8 PCB set
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H

hcbonfim

Member
Joined 2005
BYRTT 8 PCB set
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ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
milandks 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
 
A

Albrerta

Member
Joined 2007
BYRTT 8 PCB set
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DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
milandks 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
 
D

dw1narso

Member
Joined 2004
BYRTT 8 PCB set
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DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
milandks 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs (for stereo if possible)

Hello LC,

I want to join... if possible I'd like to buy the extra output output device pairs since getting them is not easy for me... If the all 4 out pairs (the 2 pairs with the pcb set + the 2 extra) could all be matched, it would be better... in case that I'm thinking to parallel them in the future...

one more question... (sorry if it's been asked bfor... is that +/-35VDC the mnimum supply? how low could it go without affecting the stability?)

Regards,
David
 
M

milandks

Member
Joined 2007
BYRTT 8 PCB set
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ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
milandks 4pcb set ( update )
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs (for stereo if possible)
 
supernet

supernet

Member
Joined 2001
BYRTT 8 PCB set
CaféNoir 6 PCB set
ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
milandks 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs (for stereo if possible)
supernet 2 pcb set
 
M

milandks

Member
Joined 2007
BYRTT 8 PCB set
CaféNoir 6 PCB set
ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs (for stereo if possible)
supernet 2 pcb set
milandks 4pcb set
 
D

dw1narso

Member
Joined 2004
BYRTT 8 PCB set
CaféNoir 6 PCB set
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DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs & isolators (for stereo if possible)
supernet 2 pcb set
milandks 4pcb set
 
T

tjencks

Member
Joined 2009
BYRTT 8 PCB set
CaféNoir 6 PCB set
ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs & isolators (for stereo if possible)
supernet 2 pcb set
milandks 4pcb set
tjencks 2pcb set
 
quanghao

quanghao

Member
Joined 2009
quanghao.com/
tjencks said:
BYRTT 8 PCB set
CaféNoir 6 PCB set
ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs & isolators (for stereo if possible)
supernet 2 pcb set
milandks 4pcb set
tjencks 2pcb set
quanghao: 2pcb set
thanks
Click to expand...
 
A

audionootje

Member
Joined 2011
BYRTT 8 PCB set
CaféNoir 6 PCB set
ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs & isolators (for stereo if possible)
supernet 2 pcb set
milandks 4pcb set
tjencks 2pcb set
quanghao: 2pcb set
audionootje: 4pcb set (2x stereo)
 
T

tritosine

Member
Joined 2008
hydrogenaudio.org
BYRTT 8 PCB set
CaféNoir 6 PCB set
ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs & isolators (for stereo if possible)
supernet 2 pcb set
milandks 4pcb set
tjencks 2pcb set
quanghao: 2pcb set
audionootje: 4pcb set (2x stereo)
tritosine 4pcb (2 pairs)
 
bobo le chat

bobo le chat

Member
Joined 2006
tritosine said:
BYRTT 8 PCB set
CaféNoir 6 PCB set
ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs & isolators (for stereo if possible)
supernet 2 pcb set
milandks 4pcb set
tjencks 2pcb set
quanghao: 2pcb set
audionootje: 4pcb set (2x stereo)
tritosine 4pcb (2 pairs)
Bobo le Chat 2 pcb set
Click to expand...


Thanks
Roger
 
Lazy Cat

Lazy Cat

Member
Joined 2007
AP2 said:
hi,
sorry, I have not found the price and if there are various releases.
I would like the version 50v, 2 Full +2 pcb only if possible.

Regards
Click to expand...

Hi AP2

What we have here up to now is VSSA PCB set at the price of 38,00 EUR/set.

VSSA PCB set includes:

- VSSA dual layer PCB with pre assembled FastOn tab terminals and SMD electronic parts (1 pcs.)
- ALF08NP16V5 mosfet transistor (1 pcs.)
- KSA1381 transistor (1 pcs.)
- KSC3503 transistor (1 pcs.)
- BC550C transistor (1 pcs.)
- BC560C transistor (1 pcs.)
- kapton insulator washer (1 pcs.)
- polyamide spacer (2 pcs.)

PSU can go up to +/-45 V and by that level VSSA delivers 80 Wrms/8 Ohms or 120 Wrms/4 Ohms, which is quite an achievement for such small module. But regardless the power more important here is its sound qualitiy, since no detail is lost. :cool:
 
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