Question about Galaxy Radios DX-93T Base CB Radio

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I would like to replace the stock 2SC1969 bipolar transistor with a ERF2030 mosfet transistor in a Galaxy 93T.Can anyone tell me if any caps need to be removed on the amp board since C203 and L33 are not used on the main pc board ???THANKS

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The radio you listed "Galaxy DX-93T Base CB Radio" utilizes a 2SC2290 final transistor. This is not a T220 2SC1969 and you cannot install an ERF2030. This is a round and white looking transistor. Replace it with only the same transistor.

Posted on Mar 19, 2011

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1 Answer

No transmit


Do you have a model # and brand.? 2sc2312, 2sc2166, 2sc1969. 2sc2028 etc.. are common RF transistors. most are discontinued. but can still be found.. MOSfets replacements are available for nearly any radio.. ERF2030's and IRF520's and there are others. but must be a RF style.

May 01, 2013 | Radio Communications

2 Answers

Where are the finals


The IRF 520 is a MOSFET and is commonly used in newer radios.
The 2SC1969 BiPolar Transistor was use in many older Single Sideband CB's and DX Radios. There are other part numbers that were used but the transistors (Finals) look like this. I hope this helps.


1296cd37-5ee7-41f5-b102-c3a5a36dcb9a.jpg f093a761-6452-4353-b29d-17f174a43d6f.jpg 1f04965d-8afd-48c8-bff5-2126e81f6b30.jpg

Jul 14, 2012 | Cobra 29 LTD CB Radio

1 Answer

Were is the keying final an a DX cb radio


There is no keying FINAL? there is a diode under the mic connector that controls TX/RX keying up.. but if your talking about the Final RF transistor its a 2sc2312,or 2sc1969 both they discontinued, so places still have them. they should be under $6.. but all radios new, are using MOSfet's.. there is a process to do the change on radios that had the analog transistors.


You could send it in to us and we can fix it.
We do not charge to look at any radio -no bench fees-..
Let me know Ill get you any info that you need.

Nov 07, 2011 | Galaxy Radios DX-2517 CB Radio

1 Answer

I have a galaxy dx959 there is a part w/ cooling fins mounted in the back of radio what would this be called and what is it used for.


Heat comb or heatsink for dissipating the heat for internal component. In this case the final transistors which could be 2sc1969 older units or Mosfet 520's newer models.
This does not come on this radio from factory. Radio has most likely had another final added for additional transmit power and the heatsink is for additional cooling.

Aug 18, 2011 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

Hello i have a cobra 148 gtl dx export model and have accidently overheated it by having a amp on top of it. It apparalently has a blown transistor and the shop in nz here is having problems in locating...


Those transistors are very hard to find. You have to be careful of you will get ripped off. You need a 2SC1969 final transistor. I only get mine from one place. Eleflow. The guy is real nice and havs a few YouTube videos on his transistors. I have installed many and never had a customer come back. Here is a link to his YouTube video. You can order from him there by just contacting him on YouTube or through e-bay. You tell him Ironfist said to talk to him. He will know. I will never purchase anywhere else. Anymore questions feel free to ask. Most people don't know this guy exists and choose to do Mosfets because of the rip off status of 2SC1969.

Mar 16, 2011 | Cobra 150 GTL DX Base CB Radio

1 Answer

The 93t have a output problem


hello this is probably down to the finals/pa transistor have given up you will find these on ebay iff you can fit them yourself goodluck

Jan 26, 2011 | Galaxy Radios DX-93T Base CB Radio

1 Answer

Looking for motorola cb finals...Where can i find some. Please disregard if there is a charge. No new email too me other than this quiestion, please. thanks.


I believe you mean Mitsubishi 2SC1969. The eleflow 2sc1969 is a cheaper and equal if not better performer. There are a lot of fake 1969s out there.
http://www.carscorals.com/carsvideos/mitsubishi-carsvideos/mitsubishi-2sc1969-eleflow-2sc1969-cb-20w-rf-transistor-comparison-test-16268.html
I perfer irf520 mosfet more durable with high swr antenna system and cheaper Mouser.... have not used them but heard good things, RF Parts..expensive and Digikey.... expensive
www.futurlec.com this place is cheap but very slow shipping 3 weeks for my stuff but good quality.

Jan 08, 2011 | Cobra 29 LTD CB Radio

1 Answer

Uniden pc66xl phillipines mosfet conversion erf2030 by ekl


Change the stock final to a 2SC1969,put a jumper across D10 diode that connects from VR5 to the audio transformer,adjust L10,L9,L8.Change C91 to a 33uf 16 volt polarized capacitor.....hope this helps............

Feb 28, 2010 | Uniden Bearcat Pro PC68XL 40-Channels Base...

2 Answers

Power up problem with alesis rs300 (ra300)


you have more than likely damaged some transistors.
the resistors have burned because of excessive current.
there are 2 typesof transistors,bipolar and mosfet
a bipolar transistor has 3 pins.1) base 2)emitter 3)collector.
an NPN is tested with the + meter lead on the base , and a PNP transistor with the - lead on the base.
TESTING
base to collector should read .5 to .6 v drop in one direction and open in the other with a digital meter on the diode check function.
base to emitter about the same,but slightly higher than the collector.
if base to collector is .5v then base to emitter is .52 or so.it is always higher than the base collector number.
between emitter and collector will read open in both directions.
if there is a short on any lead combination,the transistor is blown.
npn transistors operate on the positive rail power supply,and pnp on the negative rail.
typically a 150 watt amp will run + - 65vdc.
the transistors running on the plus side are npn and on the negative pnp.
most pnp output transistors are green.,but some are black,
so we must go by the numbers on the transistors, eg.A1076 is a pnp,B755 is a pnp and all transistors that have a C or D eg. D424 are NPN transistors. all A and B numbers are PNP and all C and D numbers are NPN.
MOSFET transistors have 3 pins 1)gate 2)drain 3)source
the source goes to power like the collector does. the drain is like the emitter,and the gate switches it on like the base does.
testing a mosfet is a different procedure.
a mosfet with k then a number e.g. k135 is a positive device like npn.
a mosfet with j and a number e.g. J50 is a negative device like pnp.
a mosfet reads open source to drain both directions.
for a positive (k number device) the plus meter lead goes on the source.,the black meter lead on the drain. on the diode test function.
jump a wire from the source to the gate for 1/2 second and remove the jumper while leaving the other two meter leads connected to the source and drain.The mosfet should switch on and the meter should show a short.that means the mosfet switched on.About 5 seconds later,the resistance from drain to source should go open.
for a p channel mosfet,it checks the same,except that the black meter lead goes on the source and gate .
a mosfet will stay switched on longer than the voltage applied to the gate,if it is driving a high impedance device such as a meter.
a bipolar transistor will not stay on when voltage is removed from the base lead.
i hope this has been of some help.

Sep 09, 2009 | Alesis RA-150 Amplifier

1 Answer

Trying to find the right FET to replace burnt up ones with


hafler use international rectifier hexfets. there is alot of confusion what constitutes a mosfet amplifier.
if the outputs are mosfets instead of bipolar transistors, it is a mosfet amp.
some designs are using mosfets to drive the switch mode power supply,but use bipolar output transistors.that is not a true mosfet amp.
you need to go to an electronic supplier for the repair industry.
or the manufacturers warranty depot,who will be able to order them.mosfets are very high current devices,you have to ask ...why did they fail. if they are the switch mode drivers,there is bad capacitors in that circuit

May 23, 2009 | MTX Thunder 5-Channel Amplifier 895 Car...

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