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Author Topic: TPL Amplifier VHF Transistor  (Read 497 times)
AD7C
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Posts: 83




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« on: December 05, 2017, 05:30:40 PM »

I am trying to identify a transistor used in a TPL VHF amplifier.  I have a couple of these but this model was a very early production run and even TPL has zero info on it.  The transistors are marked "185 798-3 412".  I suspect TRW but I have no clue. 

The amp is a TPL VHF P100-3 (or 1002-3) depending upon the label. 10w in and 120w out class C.


73,
Rich
AD7C

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K6AER
Member

Posts: 4683




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« Reply #1 on: December 08, 2017, 06:25:03 PM »

MRF-240 will work fine in the application. You need to replace all three. These are 40 watt devices.
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AD7C
Member

Posts: 83




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« Reply #2 on: Yesterday at 07:33:53 AM »

I don't think I need to replace all 3.  I lifted the tabs on all the transistors and checked them.  Only the single, driver transistor at the bottom showed bad when tested using the diode function on my DMM.  I suspect an input overload killed it and the others are fine.

However, thanks for the replacement suggestion!  I

Rich
AD7C
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K6AER
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Posts: 4683




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« Reply #3 on: Yesterday at 10:35:05 AM »

Then just replace the driver. It is also a 40 watt device.
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