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Old 23rd April 2008, 11:50 AM   #1
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Unhappy Unidentified Op-amp???

Recently bought a second hand amp, The t.amp TA-2000. One channel isn't working. A visual inspection has revealed what I believe to be a popped op-amp. It is a 14 pin socket component and the only identification on it is HEFF1. I've described it as popped or blown because there is a approx. 5 mm disc shaped chunk missing from the middle of it. Searching the net with the HEFF1 refference has proved fruitless so I would appreciate any info as I would like to get the second channel up and running.

Bruce
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Old 24th April 2008, 05:00 PM   #2
KSTR is offline KSTR  Germany
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Hhm, "HEF" sounds more like 4000 CMOS series of logic gates.

You might check if the power is applied to the chip at pins 7&14 (then it's a logic IC) or pins 4&11, then it's a quad opamp.

Probably you will need to get/buy the service manual for the amp...

- Klaus
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