Op-amp = Slop Amp?

Posted by 1973shovel (A) on June 29, 2007 at 18:12:53

UPS dropped off my Mouser order today, so I tore the top off the NHT MA-1 subwoofer amp. One of the things I'd ordered was a Texas Instruments TLE2072 op-amp to replace the TL072 the amp came with.

The TI site lists the 2072 as a direct replacement for the 072, and touts it as "the highest precision upgrade" over the TL072. For example, the TL072 has a typical slew rate of 13 V/us vs. 45 V/us for the TLE2072.

The op-amp is socketed, so replacement was simple. I listened to the stock amp for a few songs, shut it off, swapped op's, and listened again. Hmm. The bass wasn't as tight as before. More plodding.

To tell you the truth, I wasn't expecting to be able to hear much, if any difference. When Stereophile reviewed this amp in 1994, during the bench-testing phase they reported "amplifier's low-pass crossover functions, implemented using 4558 dual op-amp chips..", so I suspected THAT would be the op-amp to change for an audible improvement.

I upgraded the TL072CP to the TLE2072CP simply because it was easy, cheap ($2.25) and TI called the TLE2072CP "the highest precision upgrade" over the 072.

Could this simply be a burn-in issue with the new "improved" op-amp?

Thanks for any feedback!

This post is made possible by the generous support of people like you and our sponsors:

Topic - Op-amp = Slop Amp? - 1973shovel 18:12:53 06/29/07 (22)

Op-amp comparison - Blooze 23:41:54 07/06/07 (0)

Try different opamp types... - mpathus 00:19:04 06/30/07 (0)

RE: Op-amp = Slop Amp? - Bare 22:58:16 06/29/07 (5)

RE: Wally Jung be damned :-) - 1973shovel 09:57:41 06/30/07 (4)

RE: Wally Jung be damned :-) - nightdoggy 21:00:06 06/30/07 (3)

RE: I would not be able to sleep if I had one of those in the house - 1973shovel 06:45:20 07/01/07 (2)

Less Unimportant? - 1973shovel 08:50:12 07/01/07 (0)

RE: I would not be able to sleep if I had one of those in the house - nightdoggy 08:01:38 07/01/07 (0)

RE: Op-amp = Slop Amp? - djk 18:37:56 06/29/07 (13)

Hey djk? - 1973shovel 12:36:10 06/30/07 (2)

RE: Hey djk? - djk 19:18:03 06/30/07 (1)

RE: If you could get the schematic - 1973shovel 06:24:55 07/01/07 (0)

Quotes From The TI Site - 1973shovel 19:23:52 06/29/07 (9)

Could you explain why - clifff 13:15:57 07/01/07 (8)

RE: Could you explain why - 1973shovel 18:01:22 07/01/07 (7)

RE: Could you explain why - nightdoggy 07:56:02 07/02/07 (6)

get rid of that 4558 as fast as you can - 1973shovel 18:51:42 07/02/07 (5)

RE: get rid of that 4558 as fast as you can - nightdoggy 02:29:03 07/03/07 (4)

RE:I have Luxman tuners that use them to drive signal strength LEDs. - 1973shovel 03:11:51 07/03/07 (3)

Actually I ripped it out of both tuners! - nightdoggy 16:12:23 07/03/07 (2)

RE: my cat just ran by me with another mouse in her chops - 1973shovel 04:38:03 07/04/07 (1)

She left the last corpse on my bed! - nightdoggy 09:28:39 07/04/07 (0)

Op-amp = Slop Amp?

Post a Message!