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 Post subject: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 4:30 pm 
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Location: Bear, Delaware 19701
Does anyone know a substitute for a GE P-63525 transistor?


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 5:20 pm 
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Location: 18424 PA
What is it out of?


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 5:23 pm 
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Joined: Jun Sat 27, 2015 11:38 pm
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Location: Bear, Delaware 19701
It is in the clock movement of a RCA RZD311Y transistor clock radio from the late 60's or early 70's.


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 7:26 pm 
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Are you sure of that part number? It doesn't come up on the NTE cross reference page; http://www.nteinc.com/index.php

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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 7:54 pm 
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Location: Mountains of Mourne. Ireland.
I've been through my GE semiconductor almanac for 1973 and your numbers are not listed, JEDEC or GE!

Have you pulled and tested the transistor?
Are any of the coils open-circuit?

Here is the schematic for the radio...
https://i.ebayimg.com/images/g/Yq4AAOSw ... -l1600.jpg
...save it to your computer.

Testing transistors using the diode function on a DMM.
viewtopic.php?p=2155038#p2155038
Image
Post some photos if you wish.
Posting photos to a forum thread...
The skinny: http://antiqueradios.com/forums/viewtop ... 0#p2717120

Greg.


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 7:59 pm 
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egg wrote:

Here is the schematic for the radio...
https://i.ebayimg.com/images/g/Yq4AAOSw ... -l1600.jpg

Yup, that looks more sensible; 2SA's for RF/IF, 2SB's for audio.

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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 8:04 pm 
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Location: Mountains of Mourne. Ireland.
It's in (on-board) the clock mechanism.

Example: Junghans.
https://blog.noq2.net/content/images/atomat-07.jpg
from→ https://blog.noq2.net/junghans-ato-mat-s-clock.html

Greg.


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 9:17 pm 
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Location: 18424 PA
If it's the same German mechanism, I'd say it's a TFK transistor, Telefunken. No schematic of that part ? Try a PNP then NPN regular switching transistor, for a few seconds. I'm gonna bet PNP germanium due to the others being the same.


Tomi • 2 years ago

I have a similar clock that would need a transistor model. please for help


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noq2 Mod Tomi • 2 years ago

Any more info on the movement (model number / type)?

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Tomi noq2 • 2 years ago

I have a mechanism Junghans ATO-Mat W726. From what I was able to determine it is a transistor AC125 germanium. How can you confirm this model? Is there any substitute in transistors available in the current market?
Thank you for your help

Attachment:
ATOschematic.gif
ATOschematic.gif [ 12.34 KiB | Viewed 2029 times ]


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 10:00 pm 
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Joined: Jun Sat 27, 2015 11:38 pm
Posts: 100
Location: Bear, Delaware 19701
The radio works fine. 1.5 volts is reaching the clock movement. I don't want to pull the transistor unless I have a replacement. The number I mentioned above is the only number I see and is very prominent. Gears are not jammed. I also could not find a cross reference anywhere. I will look closer tonight.


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Thu 18, 2019 10:06 pm 
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Joined: Sep Tue 15, 2015 1:16 am
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Location: 18424 PA
Not a clock repairman but don't you have to start some of these clocks by hand?


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Fri 19, 2019 6:54 pm 
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Joined: Jun Sat 27, 2015 11:38 pm
Posts: 100
Location: Bear, Delaware 19701
I took the part with the transistor out of the clock movement. The other side of the transistor is marked GE D35. Anybody know of a substitute for this? Clock is not a manual start.


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Sat 20, 2019 9:15 pm 
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Location: Palos Verdes, CA
The NTE website shows that a replacement for a D35 transistor is a NTE103A:

http://www.nteinc.com/search.php


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Sat 20, 2019 10:21 pm 
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Joined: Jun Sat 27, 2015 11:38 pm
Posts: 100
Location: Bear, Delaware 19701
Attachment:
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20190719_141011_resize_81.jpg [ 168.53 KiB | Viewed 1896 times ]
Here are some pictures.


Attachments:
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20190719_141212_resize_91.jpg [ 271.56 KiB | Viewed 1896 times ]
20190719_141102_resize_29.jpg
20190719_141102_resize_29.jpg [ 263.29 KiB | Viewed 1896 times ]
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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Sat 20, 2019 11:42 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 14352
Location: Mountains of Mourne. Ireland.
Have you tested the transistor to verify that it has failed?
Is there continuity in the coil/s?

While ceramic capacitors have a low failure rate, why not try replacing it!
.05Z is a .05μF (microfarad) ceramic disc capacitor, rated at 10V
Cap. Tolerance Z equals +100%-20%

For oddball components, I use one of these.
Image


"ten-dollar" component testers can be found on ebay.
https://www.ebay.com/sch/i.html?_from=R ... 6&_udhi=15
Image

Greg.
oh... testing transistors - was posted earlier... :)


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 Post subject: Re: GE P63525 transistor
PostPosted: Jul Sun 21, 2019 4:01 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 6586
Location: Indianapolis, IN
Hey Greg,

Talk about sneaky & deceptive sellers !!! I looked at almost all the U.S. sellers for the 2nd unit you posted and when you pressed selection, only "A1" choice was active and it was just the acrylic cover kit for the listed price even though pics and description for entire unit were initially shown !!! All listings same thing ! What a crock of crap !

John


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 Post subject: Re: GE P63525 transistor
PostPosted: Aug Sat 24, 2019 7:15 am 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 5941
Location: Norfolk, VA
A bit late, but found this tonight - a full explanation of the movement, as used by RCA:

http://www.americanradiohistory.com/hd2 ... e-0023.pdf

http://www.americanradiohistory.com/hd2 ... e-0076.pdf

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Brian
"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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