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Need cross reference to RCA 70s transistor

M

Mike

Jan 1, 1970
0
I have a peavy amp Mark V series from the 70s, and
each channel has 4 output transistors in the TO-20, TO-03, or something like
that. Its not a TO-220 packedge,

its got the circle in the middle, and two leads comming out of the back, B
and E, and the case is C with 2 screw holes in it.

Well, I need a cross, its an RCA transistor, and it shorted. I cant find
that part number in MCM, or my datasheet site.

it says RCA, and under it says C8645, im guessing its 2SC8645? but nothing
comes up.

Above RCA, it has the serial, labled 67376-C

Any Ideas? I need 8, I might as well change all of them out preventing this
from happening in the near future. its very old amp, but it will blow the
roof off

one day, I turned it on, all the lights in the house dimmed, and blew the
fuse. again, and again.

And found 1 out of the 4 for B side shorted. I might as well change all 4,
and change the other 4 that are good just in case. you never know.

Anyway, I checked the rectifiers, and checked bias resistors, and other
resistors and so forth for aging, and drifting in value do to age, and found
none.

it just shorted between C and E, but I can get good readings from C to B,
and B to E, with about .465 for each, but .000 on C to E, indicates short, I
should have no reading here. or oL
 
B

Brian Aase

Jan 1, 1970
0
My guess is that it's a house-numbered RCA 1B05.
I would expect that you can get replacements from Peavey.
(They're probably shipping something like the MJ15024, but best
check with them to find out for sure.)

Brian Aase

Mike said:
I have a peavy amp Mark V series from the 70s, and
each channel has 4 output transistors in the TO-20, TO-03, or something like
that. Its not a TO-220 packedge,

its got the circle in the middle, and two leads comming out of the back, B
and E, and the case is C with 2 screw holes in it.

Well, I need a cross, its an RCA transistor, and it shorted. I cant find
that part number in MCM, or my datasheet site.

it says RCA, and under it says C8645, im guessing its 2SC8645? but nothing
comes up.

Above RCA, it has the serial, labled 67376-C

Any Ideas? I need 8, I might as well change all of them out preventing this
from happening in the near future. its very old amp, but it will blow the
roof off

one day, I turned it on, all the lights in the house dimmed, and blew the
fuse. again, and again.

And found 1 out of the 4 for B side shorted. I might as well change all 4,
and change the other 4 that are good just in case. you never know.

Anyway, I checked the rectifiers, and checked bias resistors, and other
resistors and so forth for aging, and drifting in value do to age, and found
none.

it just shorted between C and E, but I can get good readings from C to B,
and B to E, with about .465 for each, but .000 on C to E, indicates short, I
should have no reading here. or oL


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W

Watson A.Name - 'Watt Sun'

Jan 1, 1970
0
My guess is that it's a house-numbered RCA 1B05.
I would expect that you can get replacements from Peavey.
(They're probably shipping something like the MJ15024, but best
check with them to find out for sure.)

Brian Aase

He didn't say what supply voltage they had to handle, or whether or
not they were complementary PNP and NPN.

In the '70s RCA made some hefty power transistors such as the 40411
or 40636, both handle 90 or so volts. Both are NPN.

Also, thre is a chance that something is wrong with the drivers or
bias circuits. It's not common for the output transistors to blow out
by themselves. So double checm before you power up or you may end up
purchasing another set of transistors.


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G

Geir Klemetsen

Jan 1, 1970
0
By the way, is there any chances to find a list of properties from RCA's
transistors, Eg. Ube(max), Ic(max), .... etc ?
 
L

Lizard Blizzard

Jan 1, 1970
0
Geir said:
By the way, is there any chances to find a list of properties from RCA's
transistors, Eg. Ube(max), Ic(max), .... etc ?

In the '70s RCA published the RCA Transistor Manual, which is commonly
available from used bookstores. See www.abebooks.com or
www.everybookstore.com for used book prices.


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M

Mike

Jan 1, 1970
0
do they fail, after sitting in storage for a few years, and then finally
used and being drivin almost max??

cause, ive had quite a few fail that way, and this one did.
 
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