Replacement Transistor to PT8860

random1566 · 12th March 2011, 07:39 PM

as the title says i am looking to find an equivalent transistor to TRW PT8860. Can anyone help me?

toprepairman · 13th March 2011, 12:10 PM

Can't find much on this one.
Around 4 to 5 Watts max diss.
Vcbo 36 volts
Ia 750mA to 1A
Ft 88 to 175 MHz.
I think it's intended as a class C RF amplifier, maybe Ok up to 100MHz.
Try 2N4427

random1566 · 13th March 2011, 12:34 PM

Thank you for the reply. I am new to this section(electronics) and i can't understand to many features of electronics. There are 2 output transistors and the other one is also 2N4427. What will happen if i use a wrong transistor?

davidsrsb · 13th March 2011, 01:30 PM

Output stage of what? These are RF devices for VHF/UHF. If this is a RF circuit, it is likely to be very fussy about transistor type.

random1566 · 13th March 2011, 02:17 PM

Yes, It is RF circuit..

What to do?

toprepairman · 13th March 2011, 06:58 PM

Ok, so if the other one is also 2N4437, then it may well have been a replacement in the past so you have your answer.

random1566 · 13th March 2011, 07:05 PM

Thank you for the reply. As i am new just make me clear this: If the one of the output transistors is lets say 2N1111 it have to be also the other one 2N1111 or there is no relation between them?

toprepairman · 14th March 2011, 08:07 AM

That very much depends on the circuit, Likely they are either pushpull or in parallel in which case, yes, they should be the same.
This does not necessarily apply to audio, where commonly the best circuits use fully complementary outputs with different transistors (matched NPN and PNP).

random1566 · 14th March 2011, 08:15 AM

as i understand the solution to my problem is the 2N4427 transistor. Are there any different types of 2N4427 transistors(PNP? NPN?) or the code is enough to buy a new transistor? Also with the same code there are many companies with this transistor. What is the difference between those companies? Are all the same(any manufacturer with same code transistor will be the same as the original ?)?

toprepairman · 14th March 2011, 07:29 PM

.

12th March 2011, 07:39 PM	#1
random1566 diyAudio Member Join Date: Mar 2011	Replacement Transistor to PT8860 as the title says i am looking to find an equivalent transistor to TRW PT8860. Can anyone help me?

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13th March 2011, 12:10 PM	#2
toprepairman diyAudio Member Join Date: Nov 2010	Can't find much on this one. Around 4 to 5 Watts max diss. Vcbo 36 volts Ia 750mA to 1A Ft 88 to 175 MHz. I think it's intended as a class C RF amplifier, maybe Ok up to 100MHz. Try 2N4427

13th March 2011, 12:34 PM	#3
random1566 diyAudio Member Join Date: Mar 2011	Thank you for the reply. I am new to this section(electronics) and i can't understand to many features of electronics. There are 2 output transistors and the other one is also 2N4427. What will happen if i use a wrong transistor?

13th March 2011, 01:30 PM	#4
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	Output stage of what? These are RF devices for VHF/UHF. If this is a RF circuit, it is likely to be very fussy about transistor type.

13th March 2011, 02:17 PM	#5
random1566 diyAudio Member Join Date: Mar 2011	Yes, It is RF circuit.. What to do?

13th March 2011, 06:58 PM	#6
toprepairman diyAudio Member Join Date: Nov 2010	Ok, so if the other one is also 2N4437, then it may well have been a replacement in the past so you have your answer.

13th March 2011, 07:05 PM	#7
random1566 diyAudio Member Join Date: Mar 2011	Thank you for the reply. As i am new just make me clear this: If the one of the output transistors is lets say 2N1111 it have to be also the other one 2N1111 or there is no relation between them?

14th March 2011, 08:07 AM	#8
toprepairman diyAudio Member Join Date: Nov 2010	That very much depends on the circuit, Likely they are either pushpull or in parallel in which case, yes, they should be the same. This does not necessarily apply to audio, where commonly the best circuits use fully complementary outputs with different transistors (matched NPN and PNP).

14th March 2011, 08:15 AM	#9
random1566 diyAudio Member Join Date: Mar 2011	as i understand the solution to my problem is the 2N4427 transistor. Are there any different types of 2N4427 transistors(PNP? NPN?) or the code is enough to buy a new transistor? Also with the same code there are many companies with this transistor. What is the difference between those companies? Are all the same(any manufacturer with same code transistor will be the same as the original ?)?

14th March 2011, 07:29 PM	#10
toprepairman diyAudio Member Join Date: Nov 2010	.