Bhutchison
Member
- Joined
- Apr 18, 2016
- Messages
- 15
Hi all, I am trying to remove the LP filter from a V475-2A. I have read through many of the threads about V475 broadcast filter removal and have a question:
In the V475 Pimping thread Volker indicated that the correct procedure for 2 and 2A boards was to do the following:
- remove C8 and C9
- change C6 to 3n3
- next to C6 on the PCB there are two unused wholes / solderpads representing the a and b connections to the transformer in the schematic
(www.kubarth.com)
just do a solder bridge there
However, there are differences between the V475-2 and V475-2A schematics I have access to, particularly in this area. The V475 -2A schematic on kubarth.com shows a 3n3 capacitor between the MO-1A and MO-2A stages. The official Neumann V475-2 schematic shows no capacitor and it isn't clear to me how these stages couple together. Is there a missing C7 capacitor in this schem.?
Since there is no "filter board" like there is on the 2B, do the C6, C8 and C9 work like decoupling caps and filter high frequencies?
It would seam that the intent is to insert a solder bridge between "c" and "d" and "a" and "b" and have one 3n3 capacitor tied to ground here? Is that correct?
In the V475 Pimping thread Volker indicated that the correct procedure for 2 and 2A boards was to do the following:
- remove C8 and C9
- change C6 to 3n3
- next to C6 on the PCB there are two unused wholes / solderpads representing the a and b connections to the transformer in the schematic
(www.kubarth.com)
just do a solder bridge there
However, there are differences between the V475-2 and V475-2A schematics I have access to, particularly in this area. The V475 -2A schematic on kubarth.com shows a 3n3 capacitor between the MO-1A and MO-2A stages. The official Neumann V475-2 schematic shows no capacitor and it isn't clear to me how these stages couple together. Is there a missing C7 capacitor in this schem.?
Since there is no "filter board" like there is on the 2B, do the C6, C8 and C9 work like decoupling caps and filter high frequencies?
It would seam that the intent is to insert a solder bridge between "c" and "d" and "a" and "b" and have one 3n3 capacitor tied to ground here? Is that correct?
