newman amp |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 15 October 2020 at 9:53am |
Manufacturers will often erase numbers - or encase components in resin to stop copying, etc. You really need to try contact them to find out. Or post some more photos of where the thing comes from in the circuit, but without more info, it can only be a bit of speculation. And searching for Newman amplifier comes up empty. Where does it come from? |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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Yup,looks like two transistors, side by side, encased in potting compound. If it's dead, you could try gently chipping the resin off,and see what they actually are?
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Or - if there is a working channel, you could take some measurements and try deduce what those are. The voltages around the pins will tell you a lot - and then pop into a tester, eg:- See what it tells you, ie BJT - or Mosfet, NPN, PNP, etc. |
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Earplugs Are For Wimps!
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BJtheDJ
Young Croc Joined: 28 November 2012 Location: Bristol Status: Offline Points: 886 |
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Only references that I can find to Newman amps are these on AliBaba : |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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A quick look at the photo,i assume the outputs are mounted on the black heatsink bottom left, so the four mounted on the little silver heatsinks will be the drivers,and the 2 encapsulated ones are the pre-drivers. Looks like a BJT amp,not mosfet. As Earplug suggested above, take some voltage readings off the working one (all six pins), and then with a diode range meter ,to deduce if they are NPN or PNP.
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Be seeing you.
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