Re: [Drakelist] equivalent transistor for drake 2-C
A local store sold me a BD243C. Physically it is different (it looks like a LM7812), but they told me it is equivalent to the 40310. What do you think? 73, Franco IZ2OOS 2009/7/11 Joe Pyles epy...@indy.rr.com: I've replaced the audio output device in a couple of 2C's with the NTE175 and had NO oscillation problems. 73, Joe Pyles KC9LAD At 11:35 PM 7/10/2009, you wrote: I do NOT recommend the NTE175. It is high speed high voltage switching transistor. Because it is a double-diffused device about 50 times faster than the original part, the circuit may oscillate. Dennis AE6C On Fri, Jul 10, 2009 at 3:57 AM, Joe Pyles epy...@indy.rr.com wrote: NTE175 is listed as replacement. 73, Joe Pyles KC9LAD At 09:27 AM 7/8/2009, you 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] equivalent transistor for drake 2-C
Good input, Joe. Now we know that the NTE device is safe. That probably means the Drake circuit used some explicit frequency compensation and didn't rely on the slow power transistor for stability. Dennis AE6C On Fri, Jul 10, 2009 at 10:49 PM, Joe Pyles epy...@indy.rr.com wrote: I've replaced the audio output device in a couple of 2C's with the NTE175 and had NO oscillation problems. 73, Joe Pyles KC9LAD At 11:35 PM 7/10/2009, you wrote: I do NOT recommend the NTE175. It is high speed high voltage switching transistor. Because it is a double-diffused device about 50 times faster than the original part, the circuit may oscillate. Dennis AE6C On Fri, Jul 10, 2009 at 3:57 AM, Joe Pyles epy...@indy.rr.com wrote: NTE175 is listed as replacement. 73, Joe Pyles KC9LAD At 09:27 AM 7/8/2009, you 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] equivalent transistor for drake 2-C
NTE175 is listed as replacement. 73, Joe Pyles KC9LAD At 09:27 AM 7/8/2009, you 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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] equivalent transistor for drake 2-C
I've replaced the audio output device in a couple of 2C's with the NTE175 and had NO oscillation problems. 73, Joe Pyles KC9LAD At 11:35 PM 7/10/2009, you wrote: I do NOT recommend the NTE175. It is high speed high voltage switching transistor. Because it is a double-diffused device about 50 times faster than the original part, the circuit may oscillate. Dennis AE6C On Fri, Jul 10, 2009 at 3:57 AM, Joe Pyles mailto:epy...@indy.rr.comepy...@indy.rr.com wrote: NTE175 is listed as replacement. 73, Joe Pyles KC9LAD At 09:27 AM 7/8/2009, you 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 mailto:Drakelist@zerobeat.netDrakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list mailto:Drakelist@zerobeat.netDrakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] equivalent transistor for drake 2-C
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 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] equivalent transistor for drake 2-C
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
Re: [Drakelist] equivalent transistor for drake 2-C
It is running on 12 volts, I would think almost any NPN silicon power transistor with a TO-66 case would work, like a 2N3054 and I have a few if needed. Mike W6MXV - Original Message - From: iz oos izo...@gmail.com To: drakelist@zerobeat.net Sent: Wednesday, July 08, 2009 9:27 AM Subject: [Drakelist] equivalent transistor for drake 2-C 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
