I was listening to the SissySIT previously. The thing that I notice the most with the new amp in my system is that the image is more solid and central, and the sound in the lows have more impact. I noticed that immediately when I first heard it, and I noticed it the other day when I switch from the SissySIT and put the amps back into play after the modification.
This new amp also plays louder at the same volume setting so I set the volume control lower for the same listening level.
My speakers, older Avantgarde Unos, even though they are 103bB sensitive, sound better with this amp. So I think that even though the higher power may not be needed, perhaps the quality of the first few watts and the ability to easily handle peaks are why these amps sound good. Or perhaps it is also due to the higher H2, although looking back at your distortion measurements for the SissySIT, its distortion is only a bit lower.
I have read many people say that the Avantgarde speakers do not need power, and 2A3 amps work well. I disagree. The woofers are powered, but their input is line level from the system amplifier. So the amplifier in the system still needs to be able to handle bass. So from that perspective, the extra power is useful.
This new amp also plays louder at the same volume setting so I set the volume control lower for the same listening level.
My speakers, older Avantgarde Unos, even though they are 103bB sensitive, sound better with this amp. So I think that even though the higher power may not be needed, perhaps the quality of the first few watts and the ability to easily handle peaks are why these amps sound good. Or perhaps it is also due to the higher H2, although looking back at your distortion measurements for the SissySIT, its distortion is only a bit lower.
I have read many people say that the Avantgarde speakers do not need power, and 2A3 amps work well. I disagree. The woofers are powered, but their input is line level from the system amplifier. So the amplifier in the system still needs to be able to handle bass. So from that perspective, the extra power is useful.
good enough without cap multi or whatever
manly CRC is enough , say 47mF-0R1-47mF
of course , one can use Cap Multi , but big C after is still necessary
what ?
did I promised something , and forgot ?
in what you guys are more interested - full kits or gerbers?
in case of kits , there will be 3 elements :
A: Mu pcb with all parts , except mosfet puck and output electrolytic,
B: SIT gain pcb with all parts (input JFets smd presoldered) , except SIT , of course
C: Schade gain pcb with all parts (input JFets smd presoldered), except Mos puck and Iron
so , 2 different kits :
Option 1 : A+B (with 3W resistor set optimized for THF51/2SK182 down)
Option 2 : A+C (with 3W resistor set optimized for Mos Puck down)
Option 3 : A+B+C (with augmented 3W resistor set , covering both arrangements down)
in case of kits , there will be 3 elements :
A: Mu pcb with all parts , except mosfet puck and output electrolytic,
B: SIT gain pcb with all parts (input JFets smd presoldered) , except SIT , of course
C: Schade gain pcb with all parts (input JFets smd presoldered), except Mos puck and Iron
so , 2 different kits :
Option 1 : A+B (with 3W resistor set optimized for THF51/2SK182 down)
Option 2 : A+C (with 3W resistor set optimized for Mos Puck down)
Option 3 : A+B+C (with augmented 3W resistor set , covering both arrangements down)
I've been collecting parts intended for the original version of the BA2015 50W Schade enabled amp. That includes a set of four IXYS pucks plus a pair of 2SK182E SITs. My SITs don't seem to be well suited to the SissySIT due to their Vgs parameters. So the Singing Bush design looks like a better way to build a couple variations of a high-power Mu-follower amp.
I would opt for the A+B+C set. I was planing to use a pair of Lundahl LL1540 transformers for the Schade version of the gain stage, but can adapt as necessary.
I would opt for the A+B+C set. I was planing to use a pair of Lundahl LL1540 transformers for the Schade version of the gain stage, but can adapt as necessary.
okidoki
will do calculus and necessary logistic thinkthonk in a day or two
only bummer is somewhat slower realisation
due to myriad reasons , strictly insisting on quality , I resorted lately to pcbs made by our Chinese Brother fabs
bummer is , slower circulation of goods lately , so we need to count on that
will do calculus and necessary logistic thinkthonk in a day or two
only bummer is somewhat slower realisation
due to myriad reasons , strictly insisting on quality , I resorted lately to pcbs made by our Chinese Brother fabs
bummer is , slower circulation of goods lately , so we need to count on that