Me too.everyone is always complaining about every circuit
Those look to be hand made boards. The date codes on the 741s are I would guess 'YYM", last two digits of the year and a month code. That dates most of it to 1970.
The LM358 is like an 'up market' version of the 741, vastly better but still under-performing compared to more modern types. They consume only 20% of the power of a 741, work on a wider supply voltage range and have a wider output voltage range. For pre-amp use I would suggest an NE5532 or similar, they are DUAL op-amps but still in an 8-pin package and produce about 100 times less noise (background hiss) than a 741.
To give you some idea of how inappropriate the 741 is for quality audio, it was intended as a low speed voltage shifter and amplifier and originally used in the hammer driver circuits of teleprinters!
Brian.
I'm not sure if you noticed Thayne, but the circuit of the tone control section in post #1 is exactly the same as the one Audioguru sent you! It is just drawn in a more conventional way.That circuit is exactly for me. Nice and easy and helps me understand what is going on.
I'm not sure if you noticed Thayne, but the circuit of the tone control section in post #1 is exactly the same as the one Audioguru sent you! It is just drawn in a more conventional way.
I marvel at the way people say "There is ONE store in the entire city ..." when here, the nearest city is an hours drive away and it certainly has no component shops in it. Everything here has to come by mail order.
Brian.
The LM4562 is a dual opamp so one can be a low output impedance buffer to feed the tone controls circuit.
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