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stahlhart
Platinum Member
1318 Posts |
 Posted - 01/25/2006 : 19:39:56
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Any general consensus on what the best replacement for a standard 8-pin 741 op-amp is, in terms of audio quality? TL082CP?
C.K.
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stahlhart
Platinum Member
1318 Posts |
Posted - 01/25/2006 : 19:43:15
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I meant TL081; sorry... single op-amp in an 8-pin DIP, pins out like a 741.
C.K.
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VH100R
Copper Member
Portugal
37 Posts |
Posted - 01/25/2006 : 20:10:49
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try to find which are the ones used by some moders out there like Keeley, Analog Man, Tone Jam and Monte Allums.
Monte Allums uses for the GE7 Sniper Mod the following IC's:
* RC4559P
* TL072CN
others that I know are:
* OPA134
* NE5532AP (or similar models)
they are all supposed to be very low noise opamps and are used in all kinds of mods to quiet the majority of pedals specially BOSS ones because the components used are so crappy as we all know. |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 01/25/2006 : 21:05:43
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I can't recall having seen any Boss circuits with 741 opamps so I have a feeling that the LM741 Stahlhart is replacing isn't in a Boss pedal.
I don't agree that the components Boss uses are crappy. I actually think they sound just fine. Residual noise levels are down to -90dbu for most new pedals and to me that's very silent. |
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VH100R
Copper Member
Portugal
37 Posts |
Posted - 01/25/2006 : 21:19:39
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newer pedals may be quieter but pedals like the ge7 are really noisy. even the behringer eq700 or the dano fish n chips are quieter than the boss. And that is because the noisy IC's boss uses. I recall on the original 81's ge7 schematic that there were there TL022... those are really not suited for audio aplications.
Most people with noisy pedals can simply change the opamps for high performance one's available today. |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 01/25/2006 : 23:21:52
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Yes, people has complained about the GE-7 and in particular the TL022 circuit so you have a point there.
I just wanted to point out that I don't think Boss uses crappy components in general. We probably wouldn't like them so much if they did  |
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stahlhart
Platinum Member
1318 Posts |
Posted - 01/26/2006 : 05:56:58
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quote:
Originally posted by bossarea
I can't recall having seen any Boss circuits with 741 opamps so I have a feeling that the LM741 Stahlhart is replacing isn't in a Boss pedal.
You are correct -- the pedal I'm working on is an old Deluxe Electric Mistress (Electro-Harmonix).
It has three buffers in the audio path; first one is a 741, and then the input and output of the analog delay circuit are covered by an 8-pin dual (LM1458, RC4558 et al).
I was just asking here in the hope that I'd run into someone who has done work on pedals from other companies also...
C.K.
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phostenix
Gold Member
USA
754 Posts |
Posted - 01/26/2006 : 07:04:00
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There's that Electric Mistress again! Stop torturing me, Ethel!  (Obscure Firesign Theater reference - most of you aren't old enough to remember them, I suppose...)
I've worked on lots of "other" brands, but no 741's yet. I've got a pile of 5532's from an old audio console, but I haven't done anything with them yet. Known for low noise and their ability to drive 600 ohm loads. Great if you've got a mixing console, not so important in pedals.
Sorry I can't be more help.
Grace and peace,
Steve
P.S. I love the PH-2! Have I mentioned that already?
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thedarxide
Bronze Member
81 Posts |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 01/26/2006 : 15:16:16
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| Oh, didn't know the NF-1 used one. That probably means the SG-1 uses one too as they're made of the same components. |
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thedarxide
Bronze Member
81 Posts |
Posted - 01/26/2006 : 15:32:39
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quote:
Originally posted by bossarea
Oh, didn't know the NF-1 used one. That probably means the SG-1 uses one too as they're made of the same components.
i only did cos i took mine apart the other day
The IC on my SG-1 schematic is unlabeled, but it could be. |
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phostenix
Gold Member
USA
754 Posts |
Posted - 01/26/2006 : 16:30:47
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Yep, both the NF-1 & the SG-1 show a uPC741C in the service manuals. We learned something today.  |
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thedarxide
Bronze Member
81 Posts |
Posted - 01/26/2006 : 16:50:19
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quote:
Originally posted by phostenix
Yep, both the NF-1 & the SG-1 show a uPC741C in the service manuals. We learned something today.
Can I have a gold star?  |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 01/26/2006 : 17:42:59
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How about a llama?  |
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thedarxide
Bronze Member
81 Posts |
Posted - 01/26/2006 : 17:58:01
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well, it's not nearly as good, but okay  |
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stahlhart
Platinum Member
1318 Posts |
Posted - 01/26/2006 : 19:24:41
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I wonder how well a TL070 would work... (?)
TI's data sheet refers to it as a lower noise alternative to the TL080.
Good to hear that that PH-2 found a good home.
C.K.
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Topic |
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741 Replacement?
