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Forum Can someone help identifying what this are? I reckon it is an old diod. Need something to replace it with

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Can someone help identifying what this are? I reckon it is an old diod. Need something to replace it with

kardan over 1 year ago

TUAC TD500-C1 mono amplifier

TUAC TD500-C1 amplifier board

The simple markings on photo does not have the Anode and Cathode marked.

Please reload the page as I have updated the last image.

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geralds over 1 year ago in reply to Ian-Scott +3

Hi Ian-Scott Just I've rotated it for some readers. Best Regards Gerald ---
Ian-Scott over 1 year ago +2
Ian-Scott over 1 year ago in reply to kardan +2 verified

The diodes you have marked as 1n4148 next to .1k 250 either side of the op amp I'm sure should be 15v zenners ?

0 kardan over 1 year ago in reply to Jan Cumps

These two were missing from the start, my first thought that it might be the same as the other one you marked, but the other one in middle i do not know.
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0 Jan Cumps over 1 year ago in reply to kardan

kardan said:
the other one in middle i do not know

If the two holes are connected to the opamp pos and neg supply, I expect it's for a decoupling capacitor
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0 Jan Cumps over 1 year ago in reply to kardan

looking at the photo of the solder side, looks like there wasn't ever something mounted there. The pads look unused.
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0 Ian-Scott over 1 year ago
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0 Ian-Scott over 1 year ago
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0 Jan Cumps over 1 year ago in reply to Ian-Scott

Great!
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0 Ian-Scott over 1 year ago in reply to Jan Cumps

One is TD300 the other TD500
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0 Ian-Scott over 1 year ago in reply to Jan Cumps

Not unusual on TUAC amp modules for resistors to be omitted or even cut off
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0 Ian-Scott over 1 year ago

I would check all the R33 wirewound resistors as the have tendancy to fail
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0 Jan Cumps over 1 year ago in reply to Ian-Scott

There is a name for that. It's "munching" (edit - Muntzing) or something. Named after a USA electronics company owner that would walk down the production line and randomly cut out components.

If the device still passed the QA, the component was removed from the BOM.
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