FINISHED: JKSN-U67

bockaudio said:

Nice that you didn't overdo the value of the output cap to get "more bass".
I've done a similar mod and got a PIO cap in there.

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3nity said:

I use ERO caps a lot, since theres a local store that carries most of the values.
However i never really came to a concusion that i love them or not.

Whats your opinion?
Nice build btw.

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OPR said:

Awesome build Jess!! 8) very impressive!!

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mickdundee63 said:

Hey Jess, I'm hoping you can confirm the following transformer wiring for me for the AMI BV12. I have the data sheet however there is an inconsistency (the data sheet lists one white and two grey wires whereas I have one grey and two whites). I would contact AMI however the very sad news from their organisation is that Oliver Archut has passed away so I'm not bothering them and using the information I already have.

For this reason I have set out the wiring according to the physical transformer below. i'm hoping yours was laid out exactly the same so you can confirm this is correct:


                (to C3) white ---[]---blue (join to green)
            (to c12) yellow---[]---red (to ground)
            (to R18)  grey---[]---white (to c13)
      (join to blue)  green---[]---orange (to C9)

                        both blacks to ground

Any help you are able to provide is most appreciated.

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JessJackson said:

mickdundee63 said:

Hey Jess, I'm hoping you can confirm the following transformer wiring for me for the AMI BV12. I have the data sheet however there is an inconsistency (the data sheet lists one white and two grey wires whereas I have one grey and two whites). I would contact AMI however the very sad news from their organisation is that Oliver Archut has passed away so I'm not bothering them and using the information I already have.

For this reason I have set out the wiring according to the physical transformer below. i'm hoping yours was laid out exactly the same so you can confirm this is correct:


                (to C3) white ---[]---blue (join to green)
            (to c12) yellow---[]---red (to ground)
            (to R18)  grey---[]---white (to c13)
      (join to blue)  green---[]---orange (to C9)

                        both blacks to ground

Any help you are able to provide is most appreciated.

Click to expand...

Yes I also have one grey and two whites.

Yours seems to be wrong. I wired mine up like this.. ( I took the yellow sticker off and therefore the wires are coming out of their original sides instead of double backing underneath the tape.

Top Bobbin

            Green (to yellow) ---[]--- Orange (to Coupling Cap output).
                                      ---[]--- Black (Ground)
        Grey (to C17 100pf) ---[]--- White (XLR 2)

Lower bobbin

              Yellow (to Green) ---[]--- Red (To Ground)
                                        ---[]--- Black (Ground)
                White (To R18) ---[]--- Blue (XLR 1)

My concern was if that grey to c17 and that white to r18 were reversed then the feedback wouldn't work and my mic sounds very toppy, granted i haven't really done much work with it. I should probably shoot some sweeping white noise into it in both configurations. To see which way would be correct.

Click to expand...

JessJackson said:

mickdundee63 said:

Hey Jess, I'm hoping you can confirm the following transformer wiring for me for the AMI BV12. I have the data sheet however there is an inconsistency (the data sheet lists one white and two grey wires whereas I have one grey and two whites). I would contact AMI however the very sad news from their organisation is that Oliver Archut has passed away so I'm not bothering them and using the information I already have.

For this reason I have set out the wiring according to the physical transformer below. i'm hoping yours was laid out exactly the same so you can confirm this is correct:


                (to C3) white ---[]---blue (join to green)
            (to c12) yellow---[]---red (to ground)
            (to R18)  grey---[]---white (to c13)
      (join to blue)  green---[]---orange (to C9)

                        both blacks to ground

Any help you are able to provide is most appreciated.

Click to expand...

Yes I also have one grey and two whites.

Yours seems to be wrong. I wired mine up like this.. ( I took the yellow sticker off and therefore the wires are coming out of their original sides instead of double backing underneath the tape.

Top Bobbin

            Green (to yellow) ---[]--- Orange (to Coupling Cap output).
                                      ---[]--- Black (Ground)
        Grey (to C17 100pf) ---[]--- White (XLR 2)

Lower bobbin

              Yellow (to Green) ---[]--- Red (To Ground)
                                        ---[]--- Black (Ground)
                White (To R18) ---[]--- Blue (XLR 1)

My concern was if that grey to c17 and that white to r18 were reversed then the feedback wouldn't work and my mic sounds very toppy, granted i haven't really done much work with it. I should probably shoot some sweeping white noise into it in both configurations. To see which way would be correct.

Click to expand...

mickdundee63 said:

JessJackson said:

mickdundee63 said:

Hey Jess, I'm hoping you can confirm the following transformer wiring for me for the AMI BV12. I have the data sheet however there is an inconsistency (the data sheet lists one white and two grey wires whereas I have one grey and two whites). I would contact AMI however the very sad news from their organisation is that Oliver Archut has passed away so I'm not bothering them and using the information I already have.

For this reason I have set out the wiring according to the physical transformer below. i'm hoping yours was laid out exactly the same so you can confirm this is correct:


                (to C3) white ---[]---blue (join to green)
            (to c12) yellow---[]---red (to ground)
            (to R18)  grey---[]---white (to c13)
      (join to blue)  green---[]---orange (to C9)

                        both blacks to ground

Any help you are able to provide is most appreciated.

Click to expand...

Yes I also have one grey and two whites.

Yours seems to be wrong. I wired mine up like this.. ( I took the yellow sticker off and therefore the wires are coming out of their original sides instead of double backing underneath the tape.

Top Bobbin

            Green (to yellow) ---[]--- Orange (to Coupling Cap output).
                                      ---[]--- Black (Ground)
        Grey (to C17 100pf) ---[]--- White (XLR 2)

Lower bobbin

              Yellow (to Green) ---[]--- Red (To Ground)
                                        ---[]--- Black (Ground)
                White (To R18) ---[]--- Blue (XLR 1)

My concern was if that grey to c17 and that white to r18 were reversed then the feedback wouldn't work and my mic sounds very toppy, granted i haven't really done much work with it. I should probably shoot some sweeping white noise into it in both configurations. To see which way would be correct.

Click to expand...

Oh OK I see. I understood there was a polarity error on the data sheet so I was treating the AMI yellow as if it had the polarity dot. Well if yours is working and sounding good I will follow suit and see how it goes. I have avoided trimming my wires after soldering to allow for easy adjustments.

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JessJackson said:

A few more images I took while I was building.

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mickdundee63 said:

I swapped the grey and whites around. The way you have it wired is correct to my mind. When I wired it the reverse way the sound was thin and weak. In the original configuration it was fuller and richer, it had more balls. I wouldn't say there was a big difference to the top end, more that there was just more fullness in the low mids and bass. I can't comment on the sound more fully as I have a cheap tube and a k47 type capsule for testing purposes. It already sounds expensive though, looking forward to getting an NOS telefunken and neumann capsule in there.

Your P2P build is next level! Will have a crack at that at some stage hopefully.

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JessJackson said:

mickdundee63 said:

I swapped the grey and whites around. The way you have it wired is correct to my mind. When I wired it the reverse way the sound was thin and weak. In the original configuration it was fuller and richer, it had more balls. I wouldn't say there was a big difference to the top end, more that there was just more fullness in the low mids and bass. I can't comment on the sound more fully as I have a cheap tube and a k47 type capsule for testing purposes. It already sounds expensive though, looking forward to getting an NOS telefunken and neumann capsule in there.

Your P2P build is next level! Will have a crack at that at some stage hopefully.

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Great to hear that Mick, I won't be changing mine, I got it right the first time. :-] I might have a spare k67 that Eric built I can throw over to you on the cheap.

Thanks for the compliments... Those images actually make the soldering look messy because they are so macro.

J

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mickdundee63 said:

Thanks for the kind offer but I have a Neumann kk87 head basket/capsule that I bought a while ago. I have it wired in now and the mic sounds wonderful. Class, character and definition. Easily the best mic I have owned. Will hopefully shoot out with an original U67  and a Wunder CM67 in the next week or two. Couldn't have done it without the help of GroupDIY including yourself. Great community.

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