[SOLVED] RC4136 Replacement

[Seytar]

I am trying to fix the Analog Bass Computer (ABC) for my KLH 1 Speakers. There is significant hiss when it is turned on that I can hear through the headphones.

There are three...2-14 pin and 1-8 pin. I am pretty certain that the noise is coming from one or both of the 14 pin.

1) MC14007UB
2) RC4136J

There are quite a few replacements for the 4007 but not really any for the RC4136. The RC4136 evidently has an odd pin out. I did come across this adapter than one can solder a couple SME Op amps. My question then is which op amps are good for the ABC or will any be better than the RC4136?

 

[betwixt]

The MC14007 is a digital device, most likely something to do with signal routing but not part of the audio chain. The UB version can be used as a linear device but the performance is poor so I doubt that's how it is used. They should be available but the CD4007UB is a direct equivalent.

There is nothing special about the RC4136 in electrical terms but it does have that non-standard pin out. If you can get/make an adapter almost any quad amplifier will work as a replacement or you could use two dual or even four single amplifiers.

Brian.