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While I wasn’t looking, all major manufacturers have discontinued the 8-pin DIP plastic version of the ubiquitous LM301 op amp. When such a popular part is discontinued, there’s usually a years-long supply in multiple warehouses. I have had little luck… Continue Reading
If you have a DAP310 for repair or refurbish, please let me know. I’m now accepting repairs. Contact me by email, and I’ll provide you with my contact information. The same caveats apply: Meters, meter bezels, FETs, and several other… Continue Reading
Recently I acquired a new stock of parts for the DAP 310. My inventory now includes most parts EXCEPT the meter bezels or the FETs. If you have a DAP that needs repair, let me know. Most repairs are $200… Continue Reading
The trimmer potentiometers on the 310 are not very robust. They are not designed to be turned many, many times. If a pot is in an audio circuit, it’s easy to hear when it is going bad. When it is… Continue Reading
It’s somewhat axiomatic that replacing all electrolytic capacitors in a DAP should be the first step in a refurb. They’re about 43 years old, and they deteriorate over time. Axial capacitors are still available, but they’re getting expensive, and the… Continue Reading
The ground screw of the input/output barrier strip on a 310 that I’m refurbishing had a seized thread that caused someone to twist the head off. After a little research, I found that the Cinch 5-140-Y barrier strip is an… Continue Reading
The Dorrough Discriminate Audio Processor Model 310 revolutionized radio processing. After its release in 1973, about 9,000 units were sold. AM and FM radio enjoyed a new fidelity that it had never seen before. The DAP inspired a lot of… Continue Reading