Done somewhat in haste so here's some more details:
1. AN Soro is indeed the Audio Note Soro amp
2. The picture shows the input board and the pot is there in the bottom right hand corner
3. The amp is not mine and I am diagnosing at distance for a friend. If I could see the amp I could work it out in seconds....
4. No pot is shown in any Audio note schematics
5. So I'm really looking for someone with Soro experience to be able to tell me
Thanks
1. AN Soro is indeed the Audio Note Soro amp
2. The picture shows the input board and the pot is there in the bottom right hand corner
3. The amp is not mine and I am diagnosing at distance for a friend. If I could see the amp I could work it out in seconds....
4. No pot is shown in any Audio note schematics
5. So I'm really looking for someone with Soro experience to be able to tell me
Thanks
Oddly enough, it doesn't appear on the other photos of the Soro or the Oto, which uses the same board.
http://audiofederation.com/wp-conte...591-audio-note-soro-phono-se-open-chassis.jpg
http://audiofederation.com/wp-conte...591-audio-note-soro-phono-se-open-chassis.jpg
Andits got to be placed somewhere
(I don't know, I would have to see how the pot is connected. I assume you have just the one pot on that board. Valve heater is common to both, so hum bucking was my best guess)
I don't see any hole on it to turn the pot.
Are the output tubes working in parallel ?
Done somewhat in haste so here's some more details:
1. AN Soro is indeed the Audio Note Soro amp
2. The picture shows the input board and the pot is there in the bottom right hand corner
3. The amp is not mine and I am diagnosing at distance for a friend. If I could see the amp I could work it out in seconds....
4. No pot is shown in any Audio note schematics
5. So I'm really looking for someone with Soro experience to be able to tell me
Thanks
Can the schematics be posted here?
Can the schematics be posted here?
I suspect that would be an infringement of copyright as it seems a fairly recent (current ?) production unit. If someone has a diagram then they should be able to describe what the pot does, or where about in the circuit it connects.
4. No pot is shown in any Audio note schematics
5. So I'm really looking for someone with Soro experience to be able to tell me
Thanks
possibly in series with the filament to lower the voltage a bit.
Regulated heater psu I'm afraid
If you look at the photo link of the Soro in post #8 you will find there is no pot on that board and that since the Oto uses the same input board, also with no pot, it may be special. Maybe if you can get your associate to take a decent photo of the board and the area of the pot you could get a decent answer. It could be a different revision than most and perhaps someone, even you, living in the UK, could just phone AN and ask.
All of the guesses in the world won't get you any closer to an answer.
All of the guesses in the world won't get you any closer to an answer.
If you look at the photo link of the Soro in post #8 you will find there is no pot on that board and that since the Oto uses the same input board, also with no pot, it may be special. Maybe if you can get your associate to take a decent photo of the board and the area of the pot you could get a decent answer. It could be a different revision than most and perhaps someone, even you, living in the UK, could just phone AN and ask.
All of the guesses in the world won't get you any closer to an answer.
It is of course obvious that there is no pot in the photo in Post 8-noone is questioning that. I also know that other Otos were built with the pot. Not surprisingly I did suggest the owner contact Audio Note who haven't replied either to e mail or phone calls.
As I clearly and politely stated in Post 4 I'm looking for someone with direct experience of the Oto or Soro with this set up who can tell us what its function is, not wild guesses. It's prudent to establish precise function before the not so experienced owner replaces it as it's causing intermittent noise.
We received a reply from Audio Note today. The pot was used for balancing the ht voltage between the channels on early OTOs (and probably Soros?). Later models just used the two 20k resistors shown on the schematics that are around as it was largely redundant.
So that explains exactly why when the pot gets noisy it manifests as an intermittent crackle on both channels
So that explains exactly why when the pot gets noisy it manifests as an intermittent crackle on both channels
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