Motorola O/P transistors replacement and some basic questions

[ed]

Hi,
Grateful if an expert can help-please bear with me... i have a few
questions.I am looking to substitute 2 Motorola output transistors in
an audio amp(25w)-BD 609,BD610(Plastic package). Found 2 subs from ST
Micro-BD 909, BD910. Went to my local shops-these are not available
and they are not sure if these are imported in the country( they will
check).Meantime ..... Can a kind person go to this site
http://www.bel-india.com/Website/StaticAsp/prod_semi1.htm
,download/see 2 pdf files(they r small-plastic and metal packages) and
see if any of those transistors in those 2 files are compatible,with
what little info is there in the spec sheet(i will take the risk even
if they maybe marginally compatible).Sorry, i don't have Motorola
Specs(i can't find the specs for the ST transistors-i had got them
from an UK site called anglia or something).
Also, any of those are compatible with these belowif i cant repair
my amp. i may build one from Elliott Sound
Products-http://sound.westhost.com/project03.htm#7dec)
Power - NPN - MJE3055, TIP3055 or 2N3055 (TO-3)
Power - PNP - MJE2955, TIP2955 or MJ2955 (TO-3)

....what do u substitute a wirewound resistor(located near those output
transistors) with?Shops over here don't don't stock them.Shopkeeper
was ranting something about using fusible resistor with a wattage
rating....
.....in this project http://sound.westhost.com/project03.htm#7dec...The
ground is connected to the chassis?

Thanks.(thanks go out to J. Doe who helped me choose a subs. diode
yesterday)
Ed

 

[Dieter Wiedmann]

ed schrieb:

[Replacement for BD609/610]

http://www.bel-india.com/Website/StaticAsp/prod_semi1.htm

You may use TIP41/42B if load impedance is 8 ohms or more.


Regards,
Dieter

 

[ed]

[Replacement for BD609/610]

http://www.bel-india.com/Website/StaticAsp/prod_semi1.htm

You may use TIP41/42B if load impedance is 8 ohms or more.


Regards,
Dieter

Thanks!Thanks ,Dieter!
A small clarification please....TIP41 or TIP41B

And for those of Eliott products Transistors.....I intend to build 1
channel without the PCB(i will use a board and wires)...just for
experimentation(my first DIY project).....Hope u will respond.
Thanks again
ED

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

Hi,
Grateful if an expert can help-please bear with me... i have a few
questions.I am looking to substitute 2 Motorola output transistors in
an audio amp(25w)-BD 609,BD610(Plastic package). Found 2 subs from ST
Micro-BD 909, BD910. Went to my local shops-these are not available
and they are not sure if these are imported in the country( they will
check).Meantime ..... Can a kind person go to this site
http://www.bel-india.com/Website/StaticAsp/prod_semi1.htm
,download/see 2 pdf files(they r small-plastic and metal packages) and
see if any of those transistors in those 2 files are compatible,with
what little info is there in the spec sheet(i will take the risk even
if they maybe marginally compatible).Sorry, i don't have Motorola
Specs(i can't find the specs for the ST transistors-i had got them
from an UK site called anglia or something).
Also, any of those are compatible with these belowif i cant repair
my amp. i may build one from Elliott Sound
Products-http://sound.westhost.com/project03.htm#7dec)
Power - NPN - MJE3055, TIP3055 or 2N3055 (TO-3)
Power - PNP - MJE2955, TIP2955 or MJ2955 (TO-3)

I believe I mentioned this before, but here it is again. www.nteinc.com.

In addition to power transistors, they also have wirewound resistors.

The printed catalog shows NTE 331 and 332.

 

[Dieter Wiedmann]

A small clarification please....TIP41 or TIP41B
TIP41B/42B.


And for those of Eliott products Transistors.....I intend to build 1
channel without the PCB(i will use a board and wires)...just for
experimentation(my first DIY project).....Hope u will respond.

Ugly design and your vendor does not have fitting transistors.


Regards,
Dieter

 

[ed]

Thanks again Dieter.Shame there are no subs from bel website.Your
comment about the lousy design -is there a better one where u could
point me to?It should have few components(bec. i am not sure about
drilling holes with a 1mm HSS drill and will connect the components
with wires).
Ed

 

[ed]

Thanks watson.
Re wire wound resistor(near the power O/P transistors)- shop in
another city has them .one which is open is,i assume 4.7 Ohms(R47 10
is what i can see-it/they are discoloured).
Will it be ok if i put a 5 Ohm one or should i change all four with 5
Ohm ones?The shop might not have a 4.7 Ohm one.
Ed