Re-amping box 1k:1k transformer?

[newb]

im wanting to build a reamp. I only have a 1k to 1k transformer

can i use it?

[petemoore]

  What's a reamp ?

[bancika]

Taking output signal from one amp and amplify it with the other.
I'd say it's better with isolation transformer because you're safe from ground loops.

[Pushtone]

  What's a reamp ?

To me, Re-amping is when you pass a signal from from a recorder back into an amplifier and re-record the amp.
http://www.radialeng.com/di-xamp.htm

[Paul Marossy]

Your bigger problem will be finding an audio transformer that does better than 300Hz-3kHz. You could improve the frequency response some by using an opamp driver. There's some good info in this thread about audio transformers for use with guitars: http://www.diystompboxes.com/smfforum/index.php?topic=40603.20

Or you could look into using a Jensen transformer, but it's like $100. http://www.jensen-transformers.com/apps_sc.html

[brett]

Hi
I've never tried this, but in theory it could work.

The frequency range of audio transformers is limited at the bottom end due to a lack of inductance, and the roll-off is similar to most 1 pole filters (ie 6dB per octave).  You could use a graphic equaliser or a simple bass boost circuit to boost the bass by this amount.  At the top end, the losses are more complex, due to poor capacitive coupling and other stuff I don't really understand.  However, the same princliple applies.  A graphic equaliser could be used to compensate for the losses and achieve a more balanced sound.

Heck, I just had an idea - what if you put one of those transformers in the feedback loop of an op-amp.  Would that give gain that is the mirror-image of the transformer's response?  Or would the losses be too great at the amount of current operating in the feedback loop?

cheers

[soulsonic]

Edcor makes awesome quality small audio transformers for all kinds of applications like this and they can wind custom ones for a very reasonable price. I've used one of their 15K:15K ones to give an isolated out to an A/B box and the sound quality was superb!
And their prices are dirt cheap compared to Jensen and Lundahl!
Please check them out; I guarantee you will not be disappointed.
http://www.edcorusa.com/home.html

This is the one I used in my A/B box:  http://www.edcorusa.com/products/transformers/pc/pc15k-15k.html
Those specs are no joke!!!

Stop messing around with those garbage telephone transformers and start using the real thing.

[Paul Marossy]

A graphic equaliser could be used to compensate for the losses and achieve a more balanced sound.

I thought of that, too, but I have never personally tried it. It makes sense in theory, though.

Edcor makes awesome quality small audio transformers for all kinds of applications like this

RG had mentioned that before. I should pick one up to give it a try...

[PerroGrande]

+1 on checking out Edcor.  I just spent some time on their site this morning, and their stuff looks fantastic and very reasonably priced.

Can anyone say "economic stimulus"?  Sure... I knew you could...   

[soulsonic]

Here's a pic of the isolated A/B/Y I did:

That transformer is so beautiful!
And heavy too!

[Paul Marossy]

Looks like a quality transformer. 

[jmasciswannabe]

Check this out:

http://messageboard.tapeop.com/viewtopic.php?t=7319&postdays=0&postorder=asc&&start=15&sid=bf4800f923a16e0230fd720771bf5006

I know it doesn't use your transformer, but if you want to build a diy reamp, that seems like the inexpensive way to go. The transformers are a bit large though. Make sure you have a deep enough enclosure. I am planning on using a radio shack plastic enclosure that cost me $4 bucks. I am going to shield it if it hum.

Hopefully, there is no rule against plugging tape-op....fantastic magazine and forum! Cool mic and preamp mods!