Vintage Guitar and Bass forum

Les Paul Triumph impedance transformer

Jamie

Les Paul Triumph impedance transformer
« on: March 14, 2006, 09:13:21 PM »
Hello my fellow Les Paul Triumph bass lovers.I am looking to replace the internal transformer.Gibson doesn't carry them anymore.I belive the part # is 70985.The number on the transformer itself is 174AB22A,and is rated at 3.7 ohms.Does anybody have any leads on where I can replace it.I am lucky enough to own 2 of theses bass' I have a 71' and a 76' yes.in that creamy white color.Thanks so much.

Les Paul Triumph impedance transformer
« Reply #1 on: March 15, 2006, 05:24:45 PM »
I've never seen this part for sale anywhere, but I would suggest that you buy a Shure mic/line Z transformer (model = Shure A95U).  This unit is exactly the same (specs and appearance) as the external transformer used by the original LoZ Les Paul basses (Shure may very well have been the OEM for the Gibson AD-1 transformer).

You can either use this externally (like the AD-1) or cannibalise it for the transformer coil and implant it into your Triumph.

There are other manufacturers who make similar products as well - any of them should work.

Jamie

Les Paul Triumph impedance transformer
« Reply #2 on: March 15, 2006, 08:57:52 PM »
Thanks so much for your help. I have heard about using a microphne transformer,wasn't sure if it would work.When I get around to getting it I will make another post on it. Thanks again, Jamie

jules

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transformer
« Reply #3 on: March 16, 2006, 05:19:27 AM »
yeh, thats got to be one of the harder original parts to track down....

if you get it work by canibalising something else, please let us know...

jules

jules

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is this the part
« Reply #4 on: March 20, 2006, 06:06:24 AM »

Les Paul Triumph impedance transformer
« Reply #5 on: March 20, 2006, 05:53:44 PM »
I see the transformer in the auction pic - but it'd probably be cheaper to get it out of the Shure line transformer.

jules

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triumph innerds
« Reply #6 on: March 20, 2006, 10:52:43 PM »
which bit is it please?

Les Paul Triumph impedance transformer
« Reply #7 on: March 21, 2006, 04:26:39 PM »
It is the circled bit in the pic below (from the aforementioned control plate auction).  It is the yellow thing (usually covered in black electrical tape; see ther pics of my Triumph's guts below).  



The metal ring is a clamp that enables you to mount the transformer to the tone selector switch mounting screw (when I got mine it was just floating loose in the body cavity (see last pic) and I guessed where it was mounted (apparantly correctly, judging by the auction pic) by where the wires could reach. Interestingly enough, when I first purchased my Triumph the bridge gound was disconnected (and had 2 taped up 'extension' wires badly soldered to it). It wasn't treated very well, but has recovered nicely from the abuse.



[/img]

Jamie

Transformer
« Reply #8 on: March 24, 2006, 11:57:06 PM »
Thanks guys for the additional information.I found that I had a Hi/LO switchable microphone extender.It takes a xlr to a 1/4" jack with a switch to Hi to LO.I've taken it apart and the tranformer looks just like the one in the bass with 4 wires. I will try to install it this weekend..Jamie

 

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