D-EF47 Tribute To Oliver Archut U47 Build Thread.

Help Support GroupDIY:

Bonnie1

Well-known member
Joined
Jan 24, 2016
Messages
51
Since I'm using a 'stock' AMI power supply, I haven't messed with the heater voltage at all--I tried building my own power supply based on the schematic, but I was in over my head once I got to the wiring stage.

Interesting! Hadn't heard of anyone using a PF86 in this circuit. I wonder if it's worth trying in my mic, considering I don't have the capability to adjust the PSU.
Your PSU from AMI has 2x internal trimmers, Fil. 0-8vdc / B+ 116 - 120vdc
 

TLRT

Well-known member
Joined
Jan 9, 2014
Messages
325
Location
Hungary
Guys I'm still selling many Telefunken/Siemens EF800/EF802, you can find me in the Black market section
 

Purplenoise

Well-known member
Joined
Sep 18, 2019
Messages
231
Guys I'm still selling many Telefunken/Siemens EF800/EF802, you can find me in the Black market section
I’ve gotten a few ef800/802s from TLRT. Great prices and perfect condition. Like new and no noise or microphonics. Highly recommended
 

ElSmurf

Member
Joined
Dec 10, 2017
Messages
11
I have a question I can’t seem to find a clear answer to - does it matter if the laminations of the transformer connect to ground? I’m using Moby’s BV08 and it seems inevitable there will be a connection to ground, either through the mounting screws or the inside of the mic body.
 

Purplenoise

Well-known member
Joined
Sep 18, 2019
Messages
231
I have a question I can’t seem to find a clear answer to - does it matter if the laminations of the transformer connect to ground? I’m using Moby’s BV08 and it seems inevitable there will be a connection to ground, either through the mounting screws or the inside of the mic body.
Use plastic spacers before the nut
 

Bonnie1

Well-known member
Joined
Jan 24, 2016
Messages
51
I have a question I can’t seem to find a clear answer to - does it matter if the laminations of the transformer connect to ground? I’m using Moby’s BV08 and it seems inevitable there will be a connection to ground, either through the mounting screws or the inside of the mic body.
Transformer lam's should indeed connect to mic chassis.
 

Purplenoise

Well-known member
Joined
Sep 18, 2019
Messages
231
Transformer lam's should indeed connect to mic chassis.
Early 47s had a shield I believe connected to ground. The later versions I guess ground the lams by the mounting disk. There is no harm but is it necessary? I have made a d-ef47 and a point to point following original schematics and there are absolutely no issues ( that I know of :) with lams not touching the chassis.
 

innercityman

Well-known member
Joined
May 12, 2016
Messages
273
Location
France
I have a question I can’t seem to find a clear answer to - does it matter if the laminations of the transformer connect to ground? I’m using Moby’s BV08 and it seems inevitable there will be a connection to ground, either through the mounting screws or the inside of the mic body.

I was wondering the same, and I decided to use Colson strips instead of nuts and bolds. It's tight and solid enough to me so I'll let it like this.
 

Purplenoise

Well-known member
Joined
Sep 18, 2019
Messages
231
After finishing a ptp 47 clone my quest for a 47 is over. Now I am thinking of changing my D-EF47 towards something more modern…a modern 47. Thinking of using a toroidal output transformer, heiserman hk-47 and modern components for a cleaner sound.
Has anyone tried something like this? Impressions? Tips?
 
Top