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Jan Tue 05, 2: The only issue I saw when testing the board at work was that there was a 1 volt increase in datassheet voltage out of the second 2N stage right after the input stage when I used the 2NA transistor.

Page 3 of 3. Also if I still have some noise I will have to replace the 2N transistors in the solo and accomp mixing preamps and the complex voice preamp. This is a Conn model organ.

Looks like perhaps I could use a 2N Watch out for the fact that those have different pinouts! What I wonder is this.

2N2925 Datasheet, Equivalent, Cross Reference Search

Should be 2NA not 2NA The background noise is almost gone after replacing the 2N transistors on the reverb board. Books Support This Site: Transistor substitutes 2N sub found.

Made a mistake for the transistor number.

In most cases it didn’t seem to make a whole lot of difference. Makes it harder to find out why the 16′ bass isn’t working as I was hoping it was a bad transistor.


2N2925 Datasheet

PDF 2N data http: After a ,long while I decided to tackle the noise issue. So it looks like I may only need one transistor on the post amp board which is the 2N as the other datashete on that board form a turn on delay that mutes the audio while the rest of the organ comes up.

Previous topic Next topic. How much difference would that make if I just replaced all the 2N with the 2N? Jan Tue 05, 4: Transistor substitutes 2N sub found Dafasheet May Thu 26, 6: Still have a little noise that changes with the expression pedal setting which is after the post amp board so I will replace the three transistors on it for good measure.

2N (Micro Electronics) – PNP SILICON TRANSITOR

I’ll post the picture of the schematic in the main restoration topic viewtopic. Oddly enough it doesn’t seem to affect anything and honestly I think the reverb is better now, but that function is never used.

Transistor substitutes update Posted: I will need to do a test to see if the gain is unity or very close to unity as the reverb board sends the signal through one transistor and takes t he signal from the emitter and applies it to the emitter of the last transistor on the board to allow the clean signal to pass through.

Which section do you need to see? I used to work on organs quite a bit, years ago. I found a suitable sub for the 2N May Mon 09, 4: If I wanted to do away with the reverb board completely how could I derive the 28Vdc?


Dec Mon 31, 3: I can check it as the output of the reverb amp that drives the reverb tank has a measurement point where a DB reading is listed. Users browsing this forum: Baldwin liked to use those 2Ns, mostly “green” but occasionally “orange” as well.

Just looked and I can bypass the reverb board far as the audio signal is concerned. Mouser don’t know when they will get the MPS back in stock, but a NTE is a suitable sub and since this is just used to regulate the rod bias I feel comfortable in dataxheet that one.

Could the 1 volt increase just be what the normal signal level was when the organ was new?

2N NTE Equivalent NTE NPN high gain amplifi – Wholesale Electronics

Given these transistors just amplify the audio signal I am thinking any suitable sub will work ok. What brand of organ is this? Can you scan that section to share? It is the 2NA and I happened to find some in my stash. Anything related to the above.