Old School audio panel died, can I replace KMA-20 p/n 066-1024-09 with p/n 066-1024-03

[Mooneydreamr]

I need the MS brain trust on this one. Audio panel decided to quit sending or receiving through com1 phone, everything else seems to work including speakers and handheld mic on com1. Since I am not ready for a comprehensive upgrade I was told that these old things are easy to find. Just plug the new to you one in and go flying. Problem is, it seems I can find the part number ending in 03 everywhere, but my existing p/n ends in 09. My question is are they interchangeable? Also, if anyone knows, what does the last two digits of the p/n signify since they are stamped on rather than printed like the rest of the part #?

[MB65E]

Hi! I don’t know the part numbers but I’d be willing to try a eBay unit to see if it works. You could maybe Google the wiring diagram between the -3 and -9 to see what shakes. Legality wise I wouldn’t get to excited about it as whatever it is won’t be a major change. 
I’d pull the trigger on most of the eBay units or contact Wentworth or another salvage unit. 
Great idea posting here too! 

-Matt

[M20F]

Hi,

Scroll down it lists what the different versions are 

https://www.seam-avionic-parts.com/ProductDescription?id=182

It appears you are the proud owner of the Piper version.  

[JoshK]

I can’t tell you however I did come to find out that Jeff Odum from Trio Autopilot sales also deals with GA avionics and he was a wealth of knowledge when I bought a trip for my Arrow as well as helped me blunder my way through audio panel selection to work with the various avionics I was upgrading. He might even have something on hand to work for what you need.


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[Justin Schmidt]

19 hours ago, Mooneydreamr said:

I need the MS brain trust on this one. Audio panel decided to quit sending or receiving through com1 phone, everything else seems to work including speakers and handheld mic on com1. Since I am not ready for a comprehensive upgrade I was told that these old things are easy to find. Just plug the new to you one in and go flying. Problem is, it seems I can find the part number ending in 03 everywhere, but my existing p/n ends in 09. My question is are they interchangeable? Also, if anyone knows, what does the last two digits of the p/n signify since they are stamped on rather than printed like the rest of the part #?

If you don't want to change wiring for the time being I do have an extra one.