Revox A722

[Phil Allison]

pf...@aol.com wrote:

The clear plastic wrap around the transformer is also mostly melted.

** So it is a toroidal type ???

Should be easy enough to get one made that is near identical.


..... Phil

 

[Bruce Esquibel]

pfjw@aol.com <pfjw@aol.com> wrote:

Correct - 53VAC - I linked the clear schematic, while still looking at the
blurry one.

Ok, if this is a "for yourself" repair, I'd do what someone else suggested
and use multiple transformers. At least one for the low current pair and
the oddball for the dual 53V side.

One suggestion, you can probably find dual 48V ones without too many
problems, those had to have been used by the telcos for charging their
batteries when everything was copper based.

I really think the 5V difference is going to make little change, probably
cut a couple watts off peak output but should be totally safe to use.

At least you can see if the rest of it still works and if it does, just
leave it like that while in search of something closer to the original one.

-bruce
bje@ripco.com

 

[pfjw@aol.com]

On Tuesday, December 20, 2016 at 7:04:33 PM UTC-5, Phil Allison wrote:

pf...@aol.com wrote:


The clear plastic wrap around the transformer is also mostly melted.




** So it is a toroidal type ???

Should be easy enough to get one made that is near identical.


.... Phil

Not a toroid. Remember, this is a Revox - never use one part when three-or-more will do better. There is a clear plastic clam shell over the windings but under the end bells. It is also a 'double C' core.

I am trying to avoid multiple transformers - the on/off switching scheme is complicated enough without introducing additional connections. But, if I must go that way eventually, I will.

Peter Wieck
Melrose Park, PA

 

[Phil Allison]

pf...@aol.com wrote:

** So it is a toroidal type ???

Should be easy enough to get one made that is near identical.



Not a toroid. Remember, this is a Revox - never use one part when
three-or-more will do better. There is a clear plastic clam shell over the windings but under the end bells. It is also a 'double C' core.

I am trying to avoid multiple transformers -

** Then using a custom toroidal is the obvious way to go.

Are the no winders set up in your part of the world?




..... Phil

 

[pfjw@aol.com]

Many. Getting prices.

Peter Wieck
Melrose Park PA