The RCA 40310 is a 4A 35V device designed for wide safe operating area up to 29W in audio applications. It's very low cutoff freq of 750KHz strongly suggests epitaxial base construction which is hard to find today. The Drake application is being gentle on the device, so you can probably get away with modern substitutes but be careful of putting too much freq response in there because the circuit may oscillate. Although any number of modern transistors would probably work, it's not easy to find modern transistors in TO-66 packages.
The suggestion of a 2N3054 is a good one as that is a cousin of the common 2N3055 which ORIGINALLY had epi base construction. Unfortunately the modern manufactured versions are sometimes double diffused base and thus much, much faster. Your options are finding a NOS 2N3054 with an older date code or the modern version made by Central Semiconductor (that manufacturer clearly states epi base). Dennis AE6C On Wed, Jul 8, 2009 at 6:27 AM, iz oos <izo...@gmail.com> wrote: > Hi folks, > > I am in the need to change the output audio transistor 40310 in my > drake 2-C. Is there a modern equivalent of the 40310 so I can easily > replace it? > > 73, > > iz2oos > > _______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist >
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