40-50 Watt Pencil Tip Soldering Iron with Solder Wick. Mitsubishi RA45H8994M1 45Watt High Power PA Module Mitsubishi RA20H8994M Higher Power PA Module (4 pin/Starting Serial 60600001) ROUTE 2: If you have a TK-981 Version 2 Serial Number 60600001 or above you will need to buy items 1 thru 7 listed below.īefore getting started please reference the PDF Datasheets for the Mitsubishi Power Modules listed above. You will also need to order/acquire items 1 through 7 EXCLUDING item 3- if you removed it from your donor radio. You will need a Service monitor or signal generator if you decide to go Route 1, as you will need to tune Coil L6, as found on page 8, Grid Location 11H, of the TK-981 Supplement II Service Manual (See "Downloads" Section of website), for maximum AF. You will need to buy the new main board, this is the serial number 60600001 and up board and is Kenwood Part Number X57-6520-11A/2, this can be purchased from East Coast Transistor or Pacific Coast Parts. You will need to order Two 0.22 Ohm SMD Resistors Kenwood Part Number R92-2682-05, this can be purchased from East Coast Transistor or Pacific Coast Parts. You will also need to REMOVE D208, as shown in the TK-981 Supplement II Service Manual (See "Downloads" Section of website) the PIN Diode, this is Kenwood part number MA4PH633. You will need to remove Item 10 as pictured in the TK-981 Suppliment Service manual (See "Downloads" Section of website), this is called the "Ground Terminal" by Kenwood and Part Number E23-1136-04, which is NOT sold by East Coast Transistor or Pacific Coast Parts. Retaining Clips-located on the audio amp, 8Vdc Volatge regulator. 
You will need to salvage parts from your donor radio as well as order the following parts to construct your 45Watt TK-981:
ROUTE 1: If you have a PRE-60600001 serial number TK-981 you will need to rob parts from it and also need to buy the newer 60600001 serial number board from East Coast Transistor or Pacific Coast Parts, this is Kenwood part number X57-6520-11A/2. To construct a 45 Watt TK-981HH there are essentially two routes you can take: The radio internals are what must be modified and unfortunately you cannot use the original board (Pre-serial number 60600001) to do this modification. This PA module is a MOSFET and can handle some serious use and abuse, just looking at the metal housing you can tell from a design standpoint it was intended to get warm! The modification is not for the beginner, nor is it cheap, this is an advanced project which utilizes a chassis from a dead TK-880H (a TK-780H, TK-760HG, TK-860HG, TK-762HG, and TK-862HG will also work) for the longer heatsink, a 45 Watt Mitsubishi RA45H8994M1 PA module. The TK-981HH is a 45 Watt radio and is the coolest thing since sliced bread. Like the TK-981H 30 watt radio this also was never produced by Kenwood.
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