The AM Forum

Hi
I have a Kenwood TS-140 that has a bad transistor.
The transistor is used to to shunt RF from the receiver when in the transmit mode. Probably not too important as to what it is replaced with but I was wondering if anyone has any info on this part including what is the base, what is the collector etc. I do know that it is a NPN device and operates in the saturated mode.
I can't find it on the WEB.
There must be some info on this 25C2509 part. Maybe in Japan?

Q,
There's supposed to be a table for the specs at the bottom. Alignment did work out but there's a link at the very bottom to this particular transistor that shows the table.



2SC2509
Silicon NPN Transistor
Final RF Power Output
   
Description:
The 2SC2509 is a silicon NPN epitaxial planer type transistor designed for RF power amplifiers on HF band mobile radio applications.
   
TO-220 Case
WINTransceiver    
B  C  E

Features:

    * High Power Gain:  Gpe >/= 12dB (VCC = 12V, PO = 16W, f = 27MHz)
    * Ability to Withstand Infinite VSWR Load when Operated at:
            VCC = 16V, PO = 20W, f = 27MHz

Application:

    * 10 to 14 Watt Output Power Class AB Amplifier Applications in HF Band

Absolute Maximum Ratings: (TC = +25°C unless otherwise specified)
Collector-Emitter Voltage (RBE = Infinity), VCEO    25V
Collector-Base Voltage, VCBO    60V
Emitter-Base Voltage, VEBO    5V
Collector Current, IC    6A
Collector Power Dissipation (TA = +25°C), PD    1.7W
Collector Power Dissipation (TC = +50°C), PD    20W
Operating Junction Temperature, TJ    +150°C
Storage Temperature Range, Tstg    -55° to +150°C
Thermal Resistance, Junction-to-Case, RthJC    6.25°C/W
Thermal Resistance, Junction-to-Ambient, RthJA    73.5°C/W

Electrical Characteristics: (TC = +25°C unless otherwise specified)
Parameter    Symbol    Test Conditions    Min    Typ    Max    Unit
Collector-Base Breakdown Voltage    V(BR)CBO    IC = 1mA, IE = 0    60    -    -    V
Collector-Emitter Breakdown Voltage    V(BR)CEO    IC = 10mA, RBE = Infinity    25    -    -    V
Emitter-Base Breakdown Voltage    V(BR)EBO    IE = 5mA, IC = 0    5    -    -    V
Collector Cutoff Current    ICBO    VCB = 30V IE = 0    -    -    100    µA
Emitter Cutoff Current    IEBO    VEB = 4V, IC = 0    -    -    100    µA
DC Forward Current Gain    hFE    VCE = 12V, IC = 10mA, Note 1    10    50    180    
Power Output    PO    VCC = 12V, Pin = 1W, f = 27MHz    16    18    -    W
Collector Efficiency         60    70    -    %


http://members.tripod.com/~Malzev/comp/2sc2509.htm

These are unobtainium. Had to replace them in my 430s recently, they are the drivers to the output tranny's in that radio.

Sub's are the NTE-236  (~9$ each) and RFparts sub's in the  2sc3133  when you call to get 2sc2509's. They sell a matched pair for 19$, and have a 25$ min order limit.

Watch out because the pinout is different than the 2sc2509 for both these sub's.

Larry

How many years old is the TS-140?  Parts already unobtainable.  Compare that to how many years you could still get new replacement parts for most tube stuff, and even today n.o.s, used or easily found substitutes are usually available.

I don't see that particular bugger but there is plenty of other TS-140 stuff listed here:

http://www.partstore.com/ModelDetail.aspx?PageState=1&ModelID=264412

Maybe call them on the phone numb burr.

R.F. Parts lists them but sezs to call.

http://www.rfparts.com/2sc.html

East Coast Parts has them listed. They're the East Coast Kenwood parts supplier. They have 202 different parts listed. The 2SC-2509 was used in a number of Kenwood rigs.
2SC2509   TRANSISTOR TS-430S      $23.03

Just checked Pacific Coast Parts, the West coast Kenwood parts supplier. They have them too.