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TL072 vs. 4560?
TL072 vs. 4560?
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Old 13th July 2006, 09:29 AM   #1
kubeek is offline kubeek  Czech Republic
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Default TL072 vs. 4560?

I have a little problem in Fenderīs Bassman 400. There is everywhere used tl072 except one opamp, which is 4560. Unfortunately I am not able to find any 4560 where i live.
Is there any good reason why would one use 4560 instead of the rest of 072?
I know 072 is jfet and 4560 is bjt, but from the schematic it is not clear to me why the jfet is not used.

I suppose I can replace the 4560 with 4580, which should be even better, right?
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Old 13th July 2006, 10:07 AM   #2
Ryssen is online now Ryssen  Sweden
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They are both as bad.. They are both dual Icīs on the schema 4560
is not in the signalpath its only used as signal detection.I think.
I belive 4580 should work as well in that place.
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Old 13th July 2006, 09:31 PM   #3
kubeek is offline kubeek  Czech Republic
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i know itīs just signal detection, but why is there used another type of opamp? I donīt think any of the inputs gets too near to rail (I once heard jfet opamps donīt like it), so I just donīt know.
In fender bassman 200, the 4560 is used more, also in the signal path, even though the 200īs circuit is nearly the same as 400īs, except it has just one parametric eq.
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Old 13th July 2006, 09:47 PM   #4
Ryssen is online now Ryssen  Sweden
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Arenīt the 4560/80 cheaper and thatīs why they use them?
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Old 13th July 2006, 11:41 PM   #5
john curl is offline john curl  United States
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I doubt it. Warning!
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Old 13th July 2006, 11:49 PM   #6
anatech is offline anatech  Canada
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TL072 vs. 4560?
Hi kubeek,
Here is the datasheet for the NJM4560 . It's actually not bad if you consider the NJM4559 and NJM4558. The NJM4560 is a low noise, dual op amp. It slews around 4V / uS. Bipolar input as Ryssen noted. NJM4665 or NE5532AP should work well in that location.

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Old 14th July 2006, 11:50 AM   #7
AndrewT is offline AndrewT  Scotland
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Hi,
is the odd man only only monitoring a voltage and driving a LED indicator?

Why go for quality, speed, accuracy here?
Why change from 072 and add complications of inventory?

Why has the rest of the circuit got so many redundant half chips? or are they used in another channel?
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Old 14th July 2006, 12:20 PM   #8
anatech is offline anatech  Canada
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TL072 vs. 4560?
Hi Andrew,
It may have something to do with output current. 4558 might be fine there.

-Chris
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Old 14th July 2006, 07:42 PM   #9
kubeek is offline kubeek  Czech Republic
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Andrew, the other halves are used in the rest of the circuit, but I too donīt understand why potentialy noisy ("switching") rectifiers are on the same chip as the signal part.
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