I'm trying to restore to life a 25+ year old piece of analog signal processing gear with the help of the service manual. I have strong reason to suspect that one or more of the op amps, (RC4136 quad opamp 14 pin DIP) needs replacement. The part is readily available and the cost is peanuts, but it occurs to me to ask here if after 25 years there are one or more functionally equivalant but higher performing replacements available. By higher performing, I principly mean noise.
The same unit uses a TIP3055 (that's a 2N3055 in a TO-218) package. This seems ok so far, but as long as I'm attemping surgery I'm open to suggestions about substitutions for this as well.
The same unit uses a TIP3055 (that's a 2N3055 in a TO-218) package. This seems ok so far, but as long as I'm attemping surgery I'm open to suggestions about substitutions for this as well.