Dusty Circuit
Well-known member
Hi there,
A friend called me about three years ago and wondered if I could have a look at his racked V776 that was misbehaving. I accepted and when I lifted the lid I was greeted with this:
Note: Gray is output from V776, Blue and yellow is input to V776.
Note: I added the brass spacers.
The company that had sold him the unit had apparently fastened the input and output transformer PCB's with cable binding posts...... The wiring was also pretty sketchy so I decided to redo everything and mount the transformers on a new PCB with proper fastening and a bit tidier cabling. I also noted that one of the transformers had cracks in several places and was probably going to need a replacement.
A short while after this I got sick and had to put my life on pause for a couple of years.
Now it is time to get going with this again but I am having some trouble figuring out what the company that racked the thing was thinking.
The unit uses four Haufe RK255 as input transformers and four Haufe RK173 for the output. I am guessing that the boards the transformers are mounted to are from another type of gear, hence the messy bodge job. The resistors are 10k and the cap is a 470µF and connected on the output transformer secondary. I have tried to find this configuration on the output side on other AEG/Telefunken gear but have not found anything yet. I am a bit mystified by this and hope that maybe one of you have an idea of how this works. I can trace out a schematic if that would help.
Datasheets for transformers and schematic below:
RK173
EDIT: Added some notes to picture
A friend called me about three years ago and wondered if I could have a look at his racked V776 that was misbehaving. I accepted and when I lifted the lid I was greeted with this:
Note: Gray is output from V776, Blue and yellow is input to V776.
Note: I added the brass spacers.
The company that had sold him the unit had apparently fastened the input and output transformer PCB's with cable binding posts...... The wiring was also pretty sketchy so I decided to redo everything and mount the transformers on a new PCB with proper fastening and a bit tidier cabling. I also noted that one of the transformers had cracks in several places and was probably going to need a replacement.
A short while after this I got sick and had to put my life on pause for a couple of years.
Now it is time to get going with this again but I am having some trouble figuring out what the company that racked the thing was thinking.
The unit uses four Haufe RK255 as input transformers and four Haufe RK173 for the output. I am guessing that the boards the transformers are mounted to are from another type of gear, hence the messy bodge job. The resistors are 10k and the cap is a 470µF and connected on the output transformer secondary. I have tried to find this configuration on the output side on other AEG/Telefunken gear but have not found anything yet. I am a bit mystified by this and hope that maybe one of you have an idea of how this works. I can trace out a schematic if that would help.
Datasheets for transformers and schematic below:
RK173
EDIT: Added some notes to picture
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