I tried to get the schematic of my old HK A401 by following the layout.
Does this look like a possible amp and if it does, is there a way to improve it ?
Does this look like a possible amp and if it does, is there a way to improve it ?
An externally hosted image should be here but it was not working when we last tested it.
hum, true. gonna check that.
btw :
Q1, Q2 : 2SC1030
Q9, Q10 : 2SA777
Q6, Q8 : 2SC1509
Q3, Q4, Q5 : 2SC1345
Q7 : 2SC458
btw :
Q1, Q2 : 2SC1030
Q9, Q10 : 2SA777
Q6, Q8 : 2SC1509
Q3, Q4, Q5 : 2SC1345
Q7 : 2SC458
Q3, Q4, Q9, Q8, Q2 get power from V+00940 said:
Q5, Q6, Q10, Q1 get power from V-
Q7 gets about no power. Checking with a dmm while having the amp playing, the transistor has about 1V at each pin. I ran a basic electric simulation in LTspice, using generic transistor and it's in line with what I get.
furthermore, voltage with load are in fact +/- 37V.
I'm trying to get this schematic straight because this amp sounds (very) good and I could perhaps try build a few, to use them in a small home theater project for my father.
The circuit as shown is incomplete. Otherwise it looks like many other power amp circuits. Get it right before you try to copy it!
i updated the schematic. I forgot to add a small pcb hanging right under the main pcb for the amplification section.
As is, all the parts on the pcb are on the schematic, as well as all the wires coming in and out. If it's incomplete, it'd mean that they put a section of the amplification on the preamp pcb, which doesn't really make sense since they have put this input cap
As is, all the parts on the pcb are on the schematic, as well as all the wires coming in and out. If it's incomplete, it'd mean that they put a section of the amplification on the preamp pcb, which doesn't really make sense since they have put this input cap
I think it's just the way you've drawn it. I can see bias paths now. Maybe you could build it up on a breadboard to try it out.
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