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Old 2nd June 2006, 02:26 PM   #1
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Default Subbing Transistors Within A Unit

I am working on a receiver that has the same type of small signal transistor in the AM and MPX sections. The MPX section transistor is suspect, I am going to pull it and if I cannot determine for sure that it is defective, I would like to sub one from the AM. Speaking generally, can just about any transistor be pulled from an AM section and place left vacant without any ill effect on the AM section when I turn on to test the FM section?
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Old 3rd June 2006, 08:51 AM   #2
clem_o is offline clem_o  Philippines
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Should be ok to do that...

Good luck!

Cheers
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Old 30th June 2006, 09:30 PM   #3
jblmar is offline jblmar  United States
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Not a bad idea, but at times an intermittent transistor can be 'shocked' into working. Desoldering can produce just that result.

Ron
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Old 1st July 2006, 01:09 AM   #4
anatech is offline anatech  Canada
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Hi Ron,
Quote:
Not a bad idea, but at times an intermittent transistor can be 'shocked' into working.
Yes.
If the circuit now works after the sub., discard the other transistor and replace it. Even if the other circuit works.

-Chris
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Old 1st July 2006, 10:03 AM   #5
clem_o is offline clem_o  Philippines
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Not only on transistors - ICs too. Sometimes, the wire-bond (to silicon pad) is soooo marginal that a little thermal causes it to work (or not). Other times, the internal wires marginally touch each other (usually due to incorrect epoxy plastic flow during packaging). You can get very strange effects from that...

Uh, so what am I trying to say - Chris' advice is good - throw away the sub'd unit, particularly if it's inexpensive...

Cheers!

Clem
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Old 2nd July 2006, 02:54 AM   #6
anatech is offline anatech  Canada
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Hi Clem,
Excellent addition. IC's are certainly not exempt.

"If in doubt, yank it out!" Make sure it hits the garbage can too!

-Chris
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Old 7th July 2006, 03:32 PM   #7
jblmar is offline jblmar  United States
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How are you, Chris. Haven't be in contact with you in a while.

Ron
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Old 7th July 2006, 04:43 PM   #8
anatech is offline anatech  Canada
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Hi Ron,
Not too bad. I'm still on the right side of the grass.

How about you?

-Chris
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Old 7th July 2006, 05:12 PM   #9
jblmar is offline jblmar  United States
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Doin' fine.
Thanks

Ron
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