Marantz 2500 - Toroidal Transformer Replacement and Reassembly; Choosing Between Rewinding and New Transformer Construction; Installation of the New Toroid Transformer

Now that our toroid specifications are ready, we have two options: rewind the original transformer or have a new
one built. Both options have their advantages and disadvantages. Rewinding the old transformer requires a good
technician who knows toroidal transformers, and is careful and be patient enough to remove the existing resin
and reuse the same core and housing. The advantage is to keep the original look. The second option is simpler
because the current techniques for the construction of these transformers are widely known and depend only
upon finding a company to manufacture one. The disadvantage is in no longer having an original appearance. The
second option was the one chosen. Below is a photo of the new transformer already mounted:
Here are new photos indicating the voltages:
Now begins the final part of the process. The reassembly of the apparatus and measurements of voltages, both in
AC and in DC. Measurements should be taken at the points indicated below:
New transformer
8v – Panel lamps
6.3v – C.R.T. Filament
430v – Purple (replaced with
orange wire here)
C.T. – Yellow
160v – Blue and brown
30v – Gray and green (gray wire
replaced with green wire here)