Audio transformer repair/rewinding?

[SaturationPt]

Who is recommended for repairing or rebuilding audio transformers (Hafler design in particular)?

 

[crispycircuit]

What is the exact transformer? To help better answer the question.....

 

[SaturationPt]

It is the LF transformer in an Acoustat MK-121-C Hafler Red Medallion. Interleaved windings, nomex, not sure if it can be repaired or needs rewinding.

 

[primosounds]

It is the LF transformer in an Acoustat MK-121-C Hafler Red Medallion. Interleaved windings, nomex, not sure if it can be repaired or needs rewinding.

Heyboer does some of that. For a complete job of removing the old wire and rewiring its about twice the cost of just buyiing a new one.

 

[SaturationPt]

There are no new ones AFAIK, unless David Hafler has one in his basement.

 

[cademan]

You can still buy new output transformers, just not specific to that amp unless Hafler does have one in his basement.

Hammond and Edcore are a couple places to get transformers but these are basically general replacements and kit & hobbyists transformers.

 

[Pio1980]

This looks like a very specific item for a specific application, not a catalog listing.

 

[SaturationPt]

It is designed and manufactured for this application, and just the -C Red Medallion version, not an off-the-shelf. This is why I'm looking just for a re-wind specialist.

Unless someone can get in touch with David for me, ... I'm looking for an audio transformer specialist please.

 

[Brice]

I am using TRS and Heyboer. Both are top notch rewinding company.
Gary at TRS just rewinds transformer, Heyboer does that and makes new one also.
I've been always satisfied by both.

 

[KentTeffeteller]

Heyboer is a reliable shop to get a rewind done. And he works on difficult audio transformers, and the rare and beloved.

 

[primosounds]

There are no new ones AFAIK, unless David Hafler has one in his basement.

I meant a new off the shelf similar type of output transformer from them.

 

[triode17]

It is designed and manufactured for this application, and just the -C Red Medallion version, not an off-the-shelf. This is why I'm looking just for a re-wind specialist.

Unless someone can get in touch with David for me, ... I'm looking for an audio transformer specialist please.

Hey fellas', David Hafler passed away a few years ago. Try Heyboer.

 

[Dave451]

Hey folks, how does one get in touch with Heyboer? Their website doesn't show any contact information, as I recall. I was investigating getting an OPT rewound for a Bell amp and tried email, but no one every got back in touch with me.
Thanks
Dave

 

[Brice]

It is there:
https://www.heyboertransformers.com/

 

[Dave451]

Thanks, Brice!

 

[brando1]

What is the exact transformer? To help better answer the question.....

I am looking for someone to repair my McIntosh mc2100 transformer, I have a hum on my right channel, outputs were blown and the moron put in a 25amp slow blow fuse...

 

[grindstone]

McIntosh - Service Network

Find authorized service centers for McIntosh products near you. Our team of expert technicians ensures quality repairs and maintenance.

www.mcintoshlabs.com

 

[brando1]

The green wires going to the rectifier, between the two wires I get .3ohms and from each wire to the chassis I get the same. Is that normal?

 

[nerdorama]

I looked at the schematic. It is a center tapped winding with the CT grounded which explains why you see low resistance to ground. You should download the schematic and get familiar.

 

[brando1]

The green wires going to the rectifier, between the two wires I get .3ohms and from each wire to the chassis I get the same. Is that normal

I am looking for someone to repair my McIntosh mc2100 transformer, I have a hum on my right channel, outputs were blown and the moron put in a 25amp slow blow fuse...

Well if I put it in mono the hum short is gone but goes into the right if in stereo. Just the switch? This thing is crazy.