Bv8,12,11 replica - Support Thread

[Recording Engineer]

There’s a feeler thread in Magnetics about Moby doing T14 transformers, but it’s tied with C12A transformers and that has seemed to delay it greatly. It seems enough people aren’t hip to C12As.

 

[Moby]

Looks Great Moby! You don't do t14 for a c12 do you?

Thanks. Yes, I'm working on that. I experiment with different alloys and heat treatments. It takes time. . Also, laminations and bobbins are non standard so it ask for a custom stamping and injection tools. But it will happen, no worries

 

[duantro]

There’s a feeler thread in Magnetics about Moby doing T14 transformers, but it’s tied with C12A transformers and that has seemed to delay it greatly. It seems enough people aren’t hip to C12As.

Thanks. I keep forgetting there’s a magnetic thread now.

 

[garp]

Hi Moby ! How much for a bv12 including shipping to france ?

 

[Purplenoise]

Hi Moby ! How much for a bv12 including shipping to france ?

Best to Email him, his email is under his profile

 

[Moby]

Best to Email him, his email is under his profile

Hey, thx. Yes, I reply by email, no worries

 

[hiegdk]

Hi! I just picked up a BV-08 from @Moby to use in @poctop 's D-47 build. Since the build guide photos for that project use a different type of transformer I was wondering if anyone had any advice for mounting and wiring the BV-08. Cheers!

 

[ElSmurf]

Hi! I just picked up a BV-08 from @Moby to use in @poctop 's D-47 build. Since the build guide photos for that project use a different type of transformer I was wondering if anyone had any advice for mounting and wiring the BV-08. Cheers!

Since the D-47 and the D-EF47 are built on the same PCB base, check out the build guide for the D-EF47

Not sure if the wiring will be the same but you should get some idea of how to mount it at least.

 

[hiegdk]

Since the D-47 and the D-EF47 are built on the same PCB base, check out the build guide for the D-EF47

Not sure if the wiring will be the same but you should get some idea of how to mount it at least.

Thanks! The main issue I'm seeing is that the transformer in that example seems to have 4 leads whereas the one I have has 8 leads.

 

[ElSmurf]

Thanks! The main issue I'm seeing is that the transformer in that example seems to have 4 leads whereas the one I have has 8 leads.

That is correct. You have to bridge the two windings as per the schematic provided by Moby. Check the pdf on his website.

 

[hiegdk]

That is correct. You have to bridge the two windings as per the schematic provided by Moby. Check the pdf on his website.

Ah, that makes sense. Thanks!

 

[hiegdk]

OK, now I'm a little confused about which of the mic PCBs to use. The transformer doesn't really fit physically in the PCB marked BV8. While it does look like it would fit in the one marked T47 it also looks like the laminations would short the pads on either side of the opening.

 

[Delta Sigma]

If it fits the T47 PCB, use it. As long as it still fits inside the body tube, you can use rubber or fibre washers to stand the transformer off from the PCB, so the pads aren't shorted.

 

[ElSmurf]

The D-EF47 has the same layout as the T47 PCB, so I'd suggest using that one and checking out the D-EF47 build thread for mounting options. IIRC, I went with fiber washer in mine, as @Delta Sigma suggested.

Might also be a good idea to go over the build thread to check for value options for some critical components.

 

[hiegdk]

Thanks! Good ideas.

 

[hiegdk]

OK, just want to do a dummy check. Based on my reading of the transformer doc my understanding is that I should be joining the two green wires (on the right) to each other and the blue and white wires (on the right) to each other. Then the 4 wires on the left (red, blue, black, and white) will be soldered to the board. Is that correct?

I'm also unclear as to which of the wires on the right go to which of the S+, S-, P+, P- pads on the board.

 

[OneRoomStudio]

Does anyone know the DCR and inductances of the windings in @Moby's Bv.12?

 

[Moby]

Here we go. Cheers!

 

[OneRoomStudio]

Thank you, @Moby!!

Are you able to measure the inductances too by any chance?

 

[Moby]

Sorry, I'm a bit busy right now. The upper photo I have prepared long time ago.