is Technics SU-V50 worth repairing...

[Tekko]

Yeah, rip out the broken original very hard if not impossible to repair poweramp stage and replace it with a dx st or dx es or other poweramp of choice.

 

[padamiecki]

Yeah, rip out the broken original very hard if not impossible to repair poweramp stage and replace it with a dx st or dx es or other poweramp of choice.

Thank you for all suggestions,
that was really what I wanted to do:
remove power section and use AN7062 as the driver of something like this.
Other option is mount fet Aikido preamp inside.

 

[Tekko]

Thats not a schematic, its text file with the spice data.

 

[padamiecki]

Thats not a schematic, its text file with the spice data.

Of course,
I thought that everyone in here is a beholder of LTSpice😀

 

[padamiecki]

to be clear
10 kHz sinewave fft into 8 Ohm 10Vpp
for Q1, 2 you can use 2n5550,05401

 

[Tekko]

That circuit wouldent work, if you check the current through the shottky diodes you will find its over 6A.

 

[padamiecki]

That circuit wouldent work, if you check the current through the shottky diodes you will find its over 6A.

try to set higher resistance of R1,2
in my sim the quiescent current is ~40mA

 

[Tekko]

Even with 100Megohm for R1 and R2 i still have atleast 3A in my sim.

 

[padamiecki]

Even with 100Megohm for R1 and R2 i still have atleast 3A in my sim.

please look at the sch from b2spice
I used mosfets instead of Shottkys
PS How do you measure the current in LTSpice?

 

[padamiecki]

and this is the version with gain.
Please do not treat this proposition as finished and checked,
only the ideas

 

[padamiecki]

I would not make a mess
or lead you into inconvenience,
my propositions have to be verified
although are close to the reality and worth to build

 

[padamiecki]

the latest inspiration: http://www.tubecad.com/2011/10/28/Moskido I-out Amplifier Version 2.png

 

[Tekko]

Measuring current in ltspice is easy, just pass the cursor over a component and a current probe appears, then just left click the component to get a graph of the current.

fOr power, do the same thing but hold alt and a thermometer appears.

 

[padamiecki]

Measuring current in ltspice is easy, just pass the cursor over a component and a current probe appears, then just left click the component to get a graph of the current.

fOr power, do the same thing but hold alt and a thermometer appears.

is there way to read static voltage and current in LTSpice?
Did you read that 3A was constant or sine through shottkys?
Maybe I made something wrong, passing over the part I got the probe and after leftclick got voltage on the graph, not the current...
Power measurement with alt pressed did not work...

 

[Tekko]

Constant with no signal.