Question about Rockford Fosgate Punch 401S Car Audio Amplifier

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Transistor source and price

Punch amp 401s. Transistors TC7,TC8,TC15,TC16
Type, NPN or PNP, wattage?

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Rockford fosgate use hexfets.they are made by international rectifier and are available from toronto. they are n and p channel devices.they are not bipolar transistors...

Posted on Jul 11, 2009

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  • Master
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Those numbers appear to be from the MEHSA insulator. When inquiring about components, you need to use the circuit board designations silkscreened on the board.

You can get the schematic from Rockford. It will tell you the original part number if the components are damaged too badly to read the numbers.

If you need help, email me.
babin_perry@yahoo.com

Posted on Jun 18, 2009

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1 Answer

The type of audio power and the number on onkyo A917 amplifier


Hi
Usually there are 2 transistors for each channel, if you don't know the numbers on the transistors.
there is another way to get as close as possible to have equal or similar to the same type of transistors (NPN/PNP)
example: 2SA is PNP transistor.
there are (2SA/2SC) transistors and there are (2SB/2SD)
complementary transistors
1: you have to know the supply voltage for the transistors
2: choose transistors that it is equal to the current and voltage that suits the supply voltage.
follow this link to find suitable transistors.
be aware and be careful that there other parts you need to check on the power amplifier circuit, resistors,capacitors and drivers etc...
I would suggest (2SD1047/2SB817)

http://www.smcelectronics.com/DOWNLOADS/COMPTRANS.PDF
Good luck
Hope this helps

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There is a 4 power transistor for sg3 graphic equalizer c945 a733 D313 xxxx missing, what suppose part # to be change Is it npn or pnp?


All the transistors you have mentioned above are low power driver transistors used as mid-stage for driving power transistors - a generalised option to try is C945

Jun 03, 2015 | Audio Players & Recorders

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I need transistors ( Imt4401 and Imt4403) for High Freq.Amp (SRM450) - where can i get them?


Could be 2N4401/2N4403, PN2222A/MPS2907A, NPN/PNP, NTE replacements are NPN/123AP and PNP/159, At radio Shack, Mouser Electronics, Newark Electronics, D'Albani Corporation and a number of places as this is a very common small signal transistors, hope this helps.

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Tv was dead no vvidei no sound after checking found that power supply capacitor and horizontal deflection output transistor was defective i lost that tr no part no please tell me what should i do?


Hello
There are few models of Sony telivisions which uses transistors in vertical output section. It will be a matched pair of PNP and NPN transistors. According to Sony schematic which I have with me used 2SB6494(PNP) AND 2SD669A(NPN) as vertical outputs and 2SC2383 as vertical drive, 2SC1364 as vertical oscillator. Just try to get the orginal numbers or find its equivalents from data book. Ok.

Oct 17, 2010 | Sony KV-35S42 35" TV

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Where can i get power transistor replacement parts for my 960 watt 4 channel spl amplifier? two of the transistors are dead and i can find them anywhere. they are for the output transistors and the part...


they are a Driver Transistors 2SD718 & a 2SB688, these are Complimentary, PNP & NPN power transistors. try Radio shack, or your local parts supplier they are quite common and have replacements, equivalents too. google for them.

Jan 28, 2010 | Car Audio & Video

1 Answer

I find n.2 power transistor type 2SC1116 (npn) and n.2 type 2SA747 (pnp) for SANSUI AU11000. tanks


Try Grandata Limited at www.grandata.co.uk
They had them both in a semiconductor catalogue they sent me!
£1.10 for the first and £4.25 for the other (prices 2005).

Jan 01, 2010 | NAD C320 2-Channel Amplifier

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

Same...


In a CRT type monitor/TV the push-pull transistors are used in the vertical output section to provide both poistive and negitive signal amplification. By using a NPN and PNP transistor set you can amplifiy a signal that goes positive and negitive. A NPN uses the positive portion of the input signal and then amplifies that signal (pushing it to a higher positive signal level)(PUSH). The negative portion of that same signal to sent to a PNP transistor to amplify the negative to a more negative value PULLing the signal lower/more negative). The out puts of both transistors are combined providing a PUSH-PULL transistor set.
Now days the use a chip with all the transistors and a lot of the associated components inside. The LCD I worked on used FET's N-type and P-type (negative and positive).
I hope this helps.

Jun 30, 2008 | HP Pavilion F1703 17" LCD Monitor

1 Answer

Pioneer amph sa 9500 II


Hi yalazogeday

Your amp is fitted with two 2SD588A (NPN) and two 2SB618A (PNP) power transistors in the output stages. Click on the part for a place to get them from. These parts are no longer available from Pioneer, nor are the prescribed replacements. (the amp was built in 1978) Because of the unusual transistor package used, you may have to upgrade to a more modern transistor, and modify the mounting also.

robotek


May 24, 2008 | Audio Players & Recorders

1 Answer

NAD C350


Take a ohm meter and measure resistance from emiter to collector should have a few kilo ohm on output transistor.
If no ohm meter available , remove output transistors from circuit.
note position of transistor . you have a NPN and a PNP for each channel.
Replace fuse and power up. If fuse blows check bridge in the power supply.

80% of the time output transistor burn and blow the fuse.
before replacing output transistors check driver transistors they probably burnt also

Apr 29, 2008 | NAD C350 2-Channel Amplifier

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