U87 low output

[Greenie]

I have a U87 build (vintagemicrophonepcbkit.com) that has a fairley low output compared to anothe build I have (Vamisound). Is there any part that contrubutes to lower output or is it just the way they are constructed?

 

[Khron]

Do they have identical capsules? Or can you swap capsules between them?

 

[OneRoomStudio]

What transformer did you use? Is it wired for 50ohm or 200ohm impedance? What capsule did you use? What values did you use for the C3 cap? Lots of variables here...

 

[pasarski]

What is Varmisound? Maybe it just has more output than U87?

 

[OneRoomStudio]

What is Varmisound? Maybe it just has more output than U87?

It's another U87 board set: https://vamisound.com/pcb/u87-style-pcb-s-se/

(Jan and Milan at Vamisound do good work)

 

[ElSmurf]

How did you bias the fets? Also, did you compare the schematics and component values?

IIRC the Vami 87 isn't a 100% recreation like the one from Dany.

 

[pasarski]

It's another U87 board set: https://vamisound.com/pcb/u87-style-pcb-s-se/

(Jan and Milan at Vamisound do good work)

I see. Don't know why I saw an "r" in the name. Should be about the same gain then.