Component Identification

Connor's picture

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Joined: Jun 23, 2019

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Component Identification
June 23, 2019 - 5:30am

Hey there,

New to the forums, hoping I could get some help here.

I'm trying to identify these old components inside of a vintage organ.

https://imgur.com/a/uvzAPYj

I think the green ones are capacitors, right? What do the markings on them mean?

I know the orange ones are transistors but I don't know what the markings mean of them either.

I would really appreciate it if someone could let me know how to identify these vintage components.

Please let me know if you need any ofthere information or better quality pictures.

 

Thanks you,

 

Connor

Abhiemanyu Pandit's picture

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These are ceramic capacitors
June 24, 2019 - 1:44pm

The green ones are ceramic capacitors and 502K means that it is a 0.005 micro farad capacitors. 

Abhiemanyu Pandit's picture

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The transistors are pnp transistors
June 24, 2019 - 1:47pm

The 2SB5 is a PNP transistors made up of silicon with following features:

  • Maximum Collector-Base Voltage |Vcb|: 60 V
  • Maximum Collector-Emitter Voltage |Vce|: 60 V
  • Maximum Emitter-Base Voltage |Veb|: 5 V
  • Maximum Collector Current |Ic max|: 3 V
Bradyen's picture

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Mylar capacitor, wire wound resistor,
June 24, 2019 - 4:48pm

Hey it looks really vintage. as far as I could judge the green capacitor is a polyster capacitor (mylar) with a rating 0.005uF and high voltage. The resistors are wire wound 10k 

Looks like the circuit is used for some high voltage current sensing or voltage sensing application. Where did you get it form? 

I have no clue as to what the orange component is is. Based in no. of pin outs its most likely a transistor 

Connor's picture

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Thank you so much for the replies!
June 25, 2019 - 1:53am

Hey guys,

 

Thanks for getting back to me on this.

The circuit belongs to an old Rheem combo organ from the 60's.

It's one of 12 tone cards, the "G" one to be specific.

 

I should clarify I'm pretty much a novice with these things but I know enough to use a multimeter and solder and I'm anxious to keep learning.

 

I'm for sure replacing all the capacitors in the organ and from what I've seen the orange transistors should be replaced too, does anyone have any recommendations on what modern comments I should be replacing with?

 

Would it be worth replacing the resistors too?

 

Thanks so much,

 

Connor

Harry Chester's picture

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Joined: Oct 14, 2019

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Component replacement?
October 14, 2019 - 2:59pm

In the 60's their were some germanium transistors still existing in electronic organs, they usually look like a 5 mm LED but about 3 times longer and coated in black you could scrape the black of and use them as photocells, OC71 was the type, think their were aso some that had a metal case and used in early Japanese organs (Hammond Caddette) the only orange transistors I remember seeing were Hitachi and they where silicon NPN, I used  BC182L's to replace them, BC107's or BC109's also work and they have a metal case.

If the organ has been stored in a damp place for a long time the transistors could be a problem, resistor and capacitor problems are pretty rare in transistor circuits. If the resistors don't have a glossy coat they would be more susceptible to damp.

If you have a transistor tester available, some meters might have one built in. their shouldn't be any leakage in good silicon transistors but you get leakage in germanium transistors you need to have a few to test to find ones with the lowest leakage.

I'm assuming you have an oscilator circuit which will probably be one or two transistors and each divider circuit (Octave lower) is usually a pair of transistors, you should be able to put a meter on the collector and should have about half the supply voltage if the divider is working, and zero or supply voltage if not working.. It's easier if you have an Oscilloscope to check the circuits and that the oscillator is running, you can also check the voltages of a working generator boards to compare with the faulty one, same if you have access to a oscilloscope.

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Component replacement?
October 14, 2019 - 3:23pm

I've ony just looked at the Pictures and the orange transistors appear to be  Hitachi 2SC454 NPN Silicon, but what appears to be the oscillator transistor is a Geranium PNP transistor, which if not working will probably be a bit more difficult to find a replacement.  You can use one of a good board to test if necessary. just use minimum heat to remove or resolder

And I think the 10K resistors are ordinary carbon resistors, if you find a faulty one a normal 1/4 watt carbon resistor will do the job,  Brown, Black, Orange with maybe a silver or gold band for the tolerance, gold is 5%