rafafredd
Well-known member
For reference, this is the original schem:
There´s a studio near my house that has 12 channels of Langevin 5116b moded mic preamps. The guy found all the amps in an old radio station, all burned, in the corner, and get it for free. Strangely all the output transformers were open winding. So, he had a tech to mod it to use with the outputs transformerless. So it worked great for those ten years, but now it starts to get noisy, and then he came to me and asked if I could do something for him about those preamps. I got three channels, the ones that were most noisy, and I had a look at the mods that this tech did for him. He substituted the output tube for a 12AU7 and is running the output stage single ended. He gets the signal from the lower plate and together he did a feedback directly to the input transformer primary :?: very strange mod, if you wanna know what I think. I really do not like the concept, but I must say that the studio these things came from did great recordings on the last 10 years with those moded Langevin preamps, and the studio owner insists on using JUST these tube preamps in the recording he does, despite he having other types of preamps, including Pultecs, Ampex, and UA. He likes tubes. So, t still sounds great, but I must admit I hate the concept of the mods, and I´m sure it will sund even better with the original circuit in place again.
So, I got one of the four channels racks, with three channels of tube pres in there and bring it home. I do like the recordings that was done with the moded pres as it stands, but I would really like to have those things wired back as originals. Here is a pic of the actual unit:
Here you can see two of the output transformers. I´m sending one for CJ (if he wants to rack it open... I really think it would be very interesting to see those western PP out trafos from the inside) and the other to Bran Sowter - I´ve wrote to him about it, and I´m waiting for hime to get back to me, but I think he might be interested in dissecting it and having a recreation of this one in his PRO VINTAGE section). Hopefully Brian will make a copy, of for those of us that are curious about what goes on inside it, hopefully CJ can do his magic with this one also.
Here is a pic of the dead ones:
And here you see the output trafos side by side with an UTC LS series. The Langevin trafos are really small as you can see:
As you see, it´s not a question thread, just kind of an anouncement, as I know other people were also interested in this one sometime ago. But feel free to add anything in here.
There´s a studio near my house that has 12 channels of Langevin 5116b moded mic preamps. The guy found all the amps in an old radio station, all burned, in the corner, and get it for free. Strangely all the output transformers were open winding. So, he had a tech to mod it to use with the outputs transformerless. So it worked great for those ten years, but now it starts to get noisy, and then he came to me and asked if I could do something for him about those preamps. I got three channels, the ones that were most noisy, and I had a look at the mods that this tech did for him. He substituted the output tube for a 12AU7 and is running the output stage single ended. He gets the signal from the lower plate and together he did a feedback directly to the input transformer primary :?: very strange mod, if you wanna know what I think. I really do not like the concept, but I must say that the studio these things came from did great recordings on the last 10 years with those moded Langevin preamps, and the studio owner insists on using JUST these tube preamps in the recording he does, despite he having other types of preamps, including Pultecs, Ampex, and UA. He likes tubes. So, t still sounds great, but I must admit I hate the concept of the mods, and I´m sure it will sund even better with the original circuit in place again.
So, I got one of the four channels racks, with three channels of tube pres in there and bring it home. I do like the recordings that was done with the moded pres as it stands, but I would really like to have those things wired back as originals. Here is a pic of the actual unit:
Here you can see two of the output transformers. I´m sending one for CJ (if he wants to rack it open... I really think it would be very interesting to see those western PP out trafos from the inside) and the other to Bran Sowter - I´ve wrote to him about it, and I´m waiting for hime to get back to me, but I think he might be interested in dissecting it and having a recreation of this one in his PRO VINTAGE section). Hopefully Brian will make a copy, of for those of us that are curious about what goes on inside it, hopefully CJ can do his magic with this one also.
Here is a pic of the dead ones:
And here you see the output trafos side by side with an UTC LS series. The Langevin trafos are really small as you can see:
As you see, it´s not a question thread, just kind of an anouncement, as I know other people were also interested in this one sometime ago. But feel free to add anything in here.