Good evening! I'm working on a budget fix for spl dynamics s-2604 4-channel amplifier. Got some exploded power side fets and couple of output power transistors also.
Found a new tl494 + bc640 + 50n06 for the power supply and it's working fine now but the output transistors are 2SA1694/2SC4467 and those I do not have any at home. What I do have a lot is 2SD1047/2SB817. With quick look they seemed a lot alike the original ones so could it work with these? Should I do something else to the circuit? Will this probably cause power increase or decrease at output? Thank you for any toughts!
Found a new tl494 + bc640 + 50n06 for the power supply and it's working fine now but the output transistors are 2SA1694/2SC4467 and those I do not have any at home. What I do have a lot is 2SD1047/2SB817. With quick look they seemed a lot alike the original ones so could it work with these? Should I do something else to the circuit? Will this probably cause power increase or decrease at output? Thank you for any toughts!
Post a good quality photo of the component side of the entire main board and the component side of any driver boards if no one can help.
Here I did some comparing and edited this datasheet so that the original value is first then slash new ones value. Seems quite close to me?
Are you repairing this for yourself or is it for a paying customer?
If it's yours and you don't plan on selling it, you can use whatever you have on hand. Some substitutions work and others will not. The only way to know if they will work is to install them and to test thoroughly.
The two discolored emitter resistors need to be carefully checked to confirm that they're within tolerance.
If it's yours and you don't plan on selling it, you can use whatever you have on hand. Some substitutions work and others will not. The only way to know if they will work is to install them and to test thoroughly.
The two discolored emitter resistors need to be carefully checked to confirm that they're within tolerance.
I'm doing this to myself, was going just to change all the electrolytes because this starts to be a quite old amplifier.
This has been playing pc speakers in my sons room so it will get a good testing there if it seems to work with these substitutes. Thank you Perry Babin again!
This has been playing pc speakers in my sons room so it will get a good testing there if it seems to work with these substitutes. Thank you Perry Babin again!
Changing the capacitors is generally a waste of time. If this is to be done on a budget, I'd pull a few caps of each size/value and check them, understanding that electrolytics have a wide tolerance range.
There are a lot of amps that justify the replacing of caps (old Orions, Zapco, PG...) because they leak and damage the board but with most of these budget amps, the caps don't need to be replaced and there will be no noticeable difference if replaced.
There are a lot of amps that justify the replacing of caps (old Orions, Zapco, PG...) because they leak and damage the board but with most of these budget amps, the caps don't need to be replaced and there will be no noticeable difference if replaced.
If the cap is within tolerance, there is essentially no way that a different cap of the same value will make it sound different.
How are you going to be powering it?
How are you going to be powering it?
OK. Make sure that it's fused properly.
Using an unregulated supply (as described), the voltage will vary greatly. A computer power supply may be a better option. It's regulated and the voltage won't vary as much.
Using an unregulated supply (as described), the voltage will vary greatly. A computer power supply may be a better option. It's regulated and the voltage won't vary as much.