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Author Topic: Parts for U47 FETi (broken input pad switch)  (Read 3183 times)

soapfoot

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Parts for U47 FETi (broken input pad switch)
« on: September 11, 2013, 03:56:17 PM »

One of our FET 47s has a -10dB pad switch where the plastic (acrylic?) part has crumbled and disintegrated.

Are these parts still available, does anyone know?

Thanks!

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klaus

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Re: Parts for U47 FETi (broken input pad switch)
« Reply #1 on: September 11, 2013, 05:12:04 PM »

Fet 47 switches (all three are the same) have not been available for decades.

Workaround: remove -6dB switch from bottom, for a permanent full-output setting (= transformer secondaries in series), then use that switch to replace the crumbling one, and copy its original wiring/hook up, to obtain -10dB function.
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Klaus Heyne
German Masterworks®
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soapfoot

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Re: Parts for U47 FETi (broken input pad switch)
« Reply #2 on: September 12, 2013, 08:16:25 AM »

Thanks.

All three switches in this one look like they've seen better days, but only one has completely disintegrated. Maybe the 6dB can be hard-wired as you suggest, and the other two can be reinforced/patched up with some cyanoacrylate. Not ideal, but it seems that options are limited.
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klaus

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Re: Parts for U47 FETi (broken input pad switch)
« Reply #3 on: September 12, 2013, 01:20:22 PM »

I recently bought in a "Home Depot"- type store in Germany a clear acrylic glue named "Bondic".
It instantly sets up rock-hard and clear with exposure to ultraviolet rays from an LED lamp, included in the package.

Sort of like the quick-setting adhesive dentists use. Something like this would be an ideal former/filler/adhesive for your dilapidated switches, and it's also instantly sandable:

http://www.youtube.com/watch?v=tZrtXn4-z0o
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

soapfoot

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Re: Parts for U47 FETi (broken input pad switch)
« Reply #4 on: September 12, 2013, 09:31:32 PM »

Thanks for that tip.
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