Quad Revision Discussion Forum > TLE2072 for Quad 44.

TLE2072 for Quad 44.

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24-Nov-2019 11:53 AM

hummph

hummph

Posts: 36

Hello,

I have just purchased a late model Quad 44 (345**) which is sounding great. Looking inside I noticed  a few changes on the tone board (M12784-2). Ic704 is a tle2072 and some of the signal path electrolytics have been replaced with links. The other ic's elsewhere are tl071's and tl072's.

Are the tle2072's an improvement or would opa2134's be a better choice?

Also is there a component layout drawing for the toneboard anywhere?

Many thanks

Ken
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25-Nov-2019 01:28 AM

EJP

EJP

Posts: 1690
THD&N performance of the TLE2072 seems pretty mediocre at 0.013%. An OPA2134 would be an order of magnitude better, and an LM4562 another order. I can't see the point of replacing only IC704. This may have been a repair, although op-amp failures are vanishingly rare. Contact me off-list for a layout photograph.

EJP

Dada Electronics Australia

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26-Nov-2019 09:41 AM

hummph

hummph

Posts: 36

Many thanks Esmond. I will contact you regarding the layout photo.

Regards

Ken
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