Hello everybody! I recently wondered how I could create an exact clone of a Sony microphone. Many people want a Sony, but the price... unfortunately, I do not have connections with people who have this original microphone, and that is why I am turning to you, dear forum users!
The first thing I encountered was the lack (at all) of a photo of the complete circuit in which I could identify the manufacturers of resistors and capacitors. Therefore, if any of you have such photos or can take a photo of the original circuit, I would be very grateful if you would share it with me.
Secondly, this is a transformer. The only useful information is the measurements made by Moby:
1) "Here we go. As I promised. The guy is actually 8.7:1 ratio.
Builded around the EI35 (or probably EI375, since it's made in USA) but that's almost the same size of the laminations.
It measures approx. 600H@ 50hz (primary side) what means high % nickel alloy. Primary DCR=320ohm, sec 29ohm
I hope this helps"
2) "One more detail. I was not able to measure the laminations thickness but it's between 0.1-0.15mm. one more reason not to substitute this transformer with Bv.08, Bv.11 and similar. Those are using 0.35mm thick laminations. It change the sonics. Again... Anything between 7:1-10:1 will do the job but it will not sound the same."
Also, JJ Audio seems to say that their transformer in Akita is exactly the same as in Sony (I don’t know how true this is, I want to know your opinion)
I also found in the original manuals that the transformer is wrapped around a large permolloy core, was made in the USA and has a ratio of 7:1
I would like to find a complete analog or order an exact copy of the output transformer from someone. But this requires more precise parameters.
I will be glad for any information on the Sony C800G transformer at the moment
Third. This is a vacuum tube. Everything is simple here, the original microphone contains a Soviet tube 6Ж4П
Fourth. Peltier element. Again, from the manuals I found out that the cooling element has a 30*30 mm Peltier element, and the only question is how to make it work so that condensation does not form when temperatures change
Fifth. Condenser capsule. There is a widespread belief that the Sony capsule is an exact copy of the K67. Perhaps this is so, I’m going to order several K67 capsules and adjust the frequency response and sound in direct comparison with Sony, but this is after building the circuit and searching for a transformer. If anyone has names of capsules that are as similar as possible to the Sony capsule, please share. Or maybe someone has the technology to improve the K67 to sound like a Sony...
In general, I will be extremely glad for any information. I studied the entire Internet in search of how to create a Sony C800G clone
The first thing I encountered was the lack (at all) of a photo of the complete circuit in which I could identify the manufacturers of resistors and capacitors. Therefore, if any of you have such photos or can take a photo of the original circuit, I would be very grateful if you would share it with me.
Secondly, this is a transformer. The only useful information is the measurements made by Moby:
1) "Here we go. As I promised. The guy is actually 8.7:1 ratio.
Builded around the EI35 (or probably EI375, since it's made in USA) but that's almost the same size of the laminations.
It measures approx. 600H@ 50hz (primary side) what means high % nickel alloy. Primary DCR=320ohm, sec 29ohm
I hope this helps"
2) "One more detail. I was not able to measure the laminations thickness but it's between 0.1-0.15mm. one more reason not to substitute this transformer with Bv.08, Bv.11 and similar. Those are using 0.35mm thick laminations. It change the sonics. Again... Anything between 7:1-10:1 will do the job but it will not sound the same."
Also, JJ Audio seems to say that their transformer in Akita is exactly the same as in Sony (I don’t know how true this is, I want to know your opinion)
I also found in the original manuals that the transformer is wrapped around a large permolloy core, was made in the USA and has a ratio of 7:1
I would like to find a complete analog or order an exact copy of the output transformer from someone. But this requires more precise parameters.
I will be glad for any information on the Sony C800G transformer at the moment
Third. This is a vacuum tube. Everything is simple here, the original microphone contains a Soviet tube 6Ж4П
Fourth. Peltier element. Again, from the manuals I found out that the cooling element has a 30*30 mm Peltier element, and the only question is how to make it work so that condensation does not form when temperatures change
Fifth. Condenser capsule. There is a widespread belief that the Sony capsule is an exact copy of the K67. Perhaps this is so, I’m going to order several K67 capsules and adjust the frequency response and sound in direct comparison with Sony, but this is after building the circuit and searching for a transformer. If anyone has names of capsules that are as similar as possible to the Sony capsule, please share. Or maybe someone has the technology to improve the K67 to sound like a Sony...
In general, I will be extremely glad for any information. I studied the entire Internet in search of how to create a Sony C800G clone