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Watch out for the fact that those have different pinouts! Made a mistake for the transistor number. Jan Tue 05, 4: May Mon 09, 4: Can you scan that section to share?
This is a Conn model organ. Still have a little noise that changes with the dztasheet pedal setting which is after the post amp board so I will replace the three transistors on it for good measure. Previous topic Next topic.
Looks like perhaps I could use a 2N 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.
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. What I wonder is this.
Page 3 of 3. Transistor substitutes update Posted: Should be 2NA not 2NA The background noise is almost gone after replacing dwtasheet 2N transistors on the reverb board.
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. Could the 1 volt increase just be what the normal signal level was when the organ was new? After a ,long while I decided to tackle the noise issue.
Anything related to the above.
2N2925 Datasheet PDF
In most cases it didn’t seem to make a whole lot of difference. Transistor substitutes 2N sub found. Baldwin liked to use those 2Ns, mostly “green” but occasionally “orange” as well.
Dec Mon 31, 3: If I 2n29225 to do away with the reverb board completely how could I derive the 28Vdc? I found a suitable sub for the 2N How much difference would that make if I just replaced all the 2N with the 2N?
Jan Tue 05, 2: Mouser don’t know when they will get the MPS back in stock, datawheet a NTE is a suitable sub and since this is just used to regulate the rod bias I feel comfortable in using that one.
2N Datasheet PDF –
What brand of organ is this? Which section do you need to see? Given these transistors just amplify the audio signal I am thinking any suitable sub will work ok. Users browsing this forum: Just looked and I can bypass the reverb board far as the audio signal is concerned.
It is the 2NA and I happened to find some in my stash. May Thu 26, 6: Oddly enough it doesn’t seem to affect anything and honestly I think the reverb is better now, but that function is never used.
2N datasheet, Pinout ,application circuits Small Signal Transistors
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. I used to work on organs quite 2n295 bit, years ago. Makes it harder to find out why the 16′ bass isn’t working as I was hoping it was a bad transistor. I’ll post the picture of the schematic in the main restoration topic viewtopic. Books Support This Site: Transistor substitutes 2N sub found Posted: So it looks like I may only need one transistor on the vatasheet amp board which is n22925 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.
PDF 2N data http: