Some extra info on the Sony tubes here ,
https://gearspace.com/board/high-end/1155565-sony-c800g-w-7543-non-sony-6au6-tube.html
https://gearspace.com/board/high-end/1155565-sony-c800g-w-7543-non-sony-6au6-tube.html
How many tubes did you try?
Are you using a Sony selected tube?
Are you using the same tube that Sony used?
You might need to try 10 or more non-selected tubes to find one that works with low noise.
If you are using real 6AU6s good luck finding one that works with low noise in the Sony 800 microphones.
Yes, I had found these before. It also became clear to me that the non G version has nothing to do with the C800g version in terms of circuitry. It is a completely different microphone!You can find all the documents about the C800 and its associated PSU in technical docs section Rock
I will send you pictures from the inside mic and psu as soon as possible!!You can find all the documents about the C800 and its associated PSU in technical docs section Rock .
Id very much like to see some pictures of the inside of the Sony mic if you can Ktziavos
The C800G is totally different. Again the non G version is a cathode follower with no gain.You might need to try a number of tubes and they should be the tube Sony used because of the way Sony runs the tube in the C800 and C800G circuit
A search of this forum should help.
FWIW when I built a C800G like circuit with the 6AU6 tube operating points I found I needed to find a low noise tube and use super caps in the heater supply. I did not have any luck with real 6AU6s even ones built by Mullard etc.
YesThe C800G is totally different. Again the non G version is a cathode follower with no gain.
Is the fierce selection really necessary?
Zener diodes above 6V can often be sources of noise. Three in series across the 6V supply should be quiet.hello there diy-ers!
Question! is there any possibility that the "ocean sound> is generated from the zener diodes D103 D104 D105? What do you think?
I am planning to change them real soon to see if anything changes!! Probably tomorrow. I will come back with the results!! Thanks TubetecI was reading up about supercaps like used in the Sony , seemed to suggest the usefull life of these components is only a few years .
So you mean it can happen? I have to check them too???Zener diodes above 6V can often be sources of noise. Three in series across the 6V supply should be quiet.
Hello Cappy, thanx for your answer. I've already checked the capsule with the capacitor replace trick and the noise is still there. I uploaded and two sound clips with and without the capsule.What Ruud said is your best/first thing to check. Look at the Manley Audio website. Eveanna Manley has a video describing exactly what you are saying. Look at Support>Tech Tips>do I have a bad capsule?
It's not, it is run by a woman. Though she has a reputation of being...nasty.Wow I did not know Manley was run by a girl ,
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