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Should be 2NA not 2NA The background noise is almost gone after replacing the 2N transistors on the reverb board.

2N2925 Datasheet PDF

Users browsing this forum: The only issue I saw when testing the board at work was that there was a 1 volt increase in signal voltage out of the second 2N stage right after the input stage when I used the 2NA transistor.

Jan Tue 05, 4: Transistor substitutes 2N sub found Posted: 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.

What I wonder is this. It is the 2NA and I happened to find some in my stash.

In most cases it didn’t seem to make a whole lot of difference. Just looked and I can bypass the reverb board far as the audio signal is concerned.

This is a Conn model organ. May Thu 26, 2n22925 I’ll post the picture of the schematic in the main restoration topic viewtopic. PDF 2N data http: I used to work on organs quite a bit, years ago. I can check it as the output of the reverb amp that drives dahasheet reverb tank has a measurement point where a DB reading is listed.

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Can you scan that section to share? After a ,long while I decided to tackle the noise issue. I found a suitable sub for the 2N Previous topic Next topic. Makes it harder to find out why the 16′ bass isn’t working as I was hoping it was a bad transistor. Page 3 of 3.

Made a mistake for the transistor number. Watch out for the fact that those have different pinouts! Given these transistors just amplify the audio signal I am thinking any suitable sub will work ok. Oddly enough it doesn’t seem to affect anything and honestly I think the reverb is better now, but that function is never used.

Jan Tue 05, 2: Could the 1 volt increase just be what the normal signal level was when the organ was new? If I wanted to do away with the reverb board completely how could I derive the 28Vdc?

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Mouser don’t know when they will get the Xatasheet 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 using that one. 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. What brand of organ is this? 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 2n925 transistor on the board to allow the clean signal to pass through.


Transistor substitutes 2N sub found. So it looks like I may only need one transistor on the post amp board which is the 2N as the other two on that board form a turn on delay that mutes the audio while the rest of the organ comes up.

Books Support This Site: How much difference would that make if I just replaced all the 2N with the 2N? May Mon 09, 4: Transistor substitutes update Posted: Which section do you need to see? Looks like perhaps I could use a 2N Anything related to the above.

Dec Mon 31, 3: Baldwin liked to use those 2Ns, mostly “green” but occasionally “orange” as well.