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2n2207 for 547 horizontal sweep and 3A1, 3A6 multivibrator
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FYI
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Had an issue with a recently acquired 3A6 - trace switching multivibrator was inop. Contact cleaning and reseating the transistors did the trick. The interesting part was that both transistors had been replaced with what appear to be Motorola devices. They are labeled exactly as follows: M151 0188 Haven't tried to source or cross them. Since they work in the 3A6 they might do fine in the 547, also. Would like to be copied on any follow-ups. Bernd Schroder In a message dated 8/28/2008 8:53:03 PM Pacific Daylight Time,
larynx222@... writes: I'm new to this group, and I can't speak as an expert, but I had a 2N2207 go bad in the multivibrator section of a 3A1 plugin from a 565 scope. I also had trouble finding this transistor, so I tried a 2N404a and it has worked just fine for the past 6 months. I don't know if the operating parameters are more demanding in the sweep section of a 547, but it might be worth a try. 2N404a's were a lot easier to find If an easy source for 2N2207's exists I'd like to hear about it also. Hope this helps ----- Original Message ---- From: samuelrankin <_sam.rankin@... (mailto:sam.rankin@...) > To: _TekScopes@yahoogrouTekSco_ (mailto:TekScopes@...) Sent: Thursday, August 28, 2008 5:37:53 PM Subject: [TekScopes] 2n2207 for 547 horizontal sweep. The horizontal sweep on one of my 547 oscilloscopes died yesterday. I've been able to diagnose the root cause as being a faulty 2N2207 PNP transistor. My question to the group is: where can I find some replacement transistors. A quick search yielded American Microsemiconductor. But the minimum $50 order is way overkill. Thanks in advance for your help. Regards, Sam ****New MapQuest Local shows what's happening at your destination. Dining, Movies, Events, News & more. Try it out! () |
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