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larry greenwood
Copper Member
Malaysia
42 Posts |
 Posted - 03/28/2010 : 11:10:36
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hello
just bought the rat 2 yesterday
i tried it after when home
it sounds nice
i can't say it sounds superb because i haven't heard one of the vintage before so far
but the pedal seems to have OP07 in it
the seller said it was from somewhere in 90's production
made in usa and serial# RT-256841
i read on other post, some said that LM308 is better than any rat's chip
could anyone help me with the serial#
made in what year?and what is differences between LM308 and OP07?
any advices are welcomes
thank you
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Dirk_Hendrik
Copper Member
Netherlands
28 Posts |
Posted - 03/28/2010 : 17:51:22
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quote:
[i]
year?and what is differences between LM308 and OP07?
IMHO... te difference between a crappy Rat (op07) and a good Rat (LM308). |
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larry greenwood
Copper Member
Malaysia
42 Posts |
Posted - 03/28/2010 : 18:01:15
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don't get it
i read this somewhere
it says that the made in usa and under #300000 have LM308 chip
but mine has OP07
and if i bought the LM308 and replace it with OP07 will it sound great?
does anyone here has the schematic for RAT2 |
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larry greenwood
Copper Member
Malaysia
42 Posts |
Posted - 03/28/2010 : 18:07:17
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quote:
Originally posted by Dirk_Hendrik
quote:
[i]
year?and what is differences between LM308 and OP07?
IMHO... te difference between a crappy Rat (op07) and a good Rat (LM308).
and thanks dirk for your humble opinion
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bside2234
Copper Member
USA
15 Posts |
Posted - 03/28/2010 : 23:08:29
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| I have a few of the Rat2's. 2 have the 308 in them and I prefer the one without the 308. It sounds a lot fuller to me. I've also got a Vintage Rat with the 308 in it. I dislike this one the most. Very thin sounding. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 03/29/2010 : 08:30:42
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Hi larry greenwood
As tone is such a subjective issue.
may I suggest you fit a good quality IC socket to your RAT.
That way you'll be able to experiment with many different opamps.
Not just the LM308 & your current OP07.
And I belive Laurie has a couple of different,
or different era Rat's as well,
perhaps he can give you a few pointers.
Regards Dr. Bob |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 03/29/2010 : 15:34:49
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quote:
Originally posted by Dr. Bob
[And I belive Laurie has a couple of different,
or different era Rat's as well,
perhaps he can give you a few pointers.
I have two 1986 vintage rats and a recent "vintage reissue". They all have the LM308 chip... it sounds fine to my ear, but I've never heard a rat with another chip, so I havwe nothing to comare them to.
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bside2234
Copper Member
USA
15 Posts |
Posted - 03/29/2010 : 17:57:09
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I put my Vintage Rat with the 308 with my Rat2 yesterday just to give them another try side-by-side. If you set the knobs on the two in the same places they sound completely different. I set my Rat2 to how I like it and tried to set the Vintage Rat to sound the same. It gets really close but it is quite a bit thinner sounding. At least to me.
I agree with the Doc. Socket it and try different ones. |
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larry greenwood
Copper Member
Malaysia
42 Posts |
Posted - 03/29/2010 : 21:25:55
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quote:
Originally posted by bside2234
I agree with the Doc. Socket it and try different ones.
how can i do that
which ic should i use?
and should i replace any components other than the 308?
if replacing the chip only, will it heat the opamp? |
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larry greenwood
Copper Member
Malaysia
42 Posts |
Posted - 03/29/2010 : 21:44:45
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op-amp and ic socket, these two 'new words' are actually referring to each other, right?(please correct me if i'm wrong)
sorry not use with a new words
so like dr bob suggest
change the socket which mean change the op-amp itself with a good quality one can perhaps upgrade the tone
so any other idea?
which op amp should i use?
should i change the ic socket without changing any components? |
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nosi0
Gold Member
Netherlands
511 Posts |
Posted - 03/30/2010 : 00:13:45
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This is an IC socket:
You simply de-solder the old IC and solder in the IC socket. now you can push which ever IC you want into the IC socket. this means you don't have to solder every time you want to change the IC. |
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ranjam
Bronze Member
Canada
82 Posts |
Posted - 03/30/2010 : 02:02:20
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| I'm often wrong (just ask my wife), but the Rat and Rat 2 had different clippers, if I remember rightly. If you think you want a Rat with 1N4148's and you get LED's, well, it ain't gonna sound the same. Rather than swap chips, get a schematic, adjust the EQ first, and then try diodes if you still aren't happy. |
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larry greenwood
Copper Member
Malaysia
42 Posts |
Posted - 03/30/2010 : 06:26:55
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okay
now i have to find an ic socket, de-solder the OP07, solder an ic socket, clip the new ic
then adjust an EQ?
can anyone tell me how to adjust an EQ?
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ranjam
Bronze Member
Canada
82 Posts |
Posted - 03/30/2010 : 06:59:04
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| Oi vey! Maybe there aren't any good technicians in Malaysia, but geez, if you hafta ask, I'd leave it alone. Try the simple Ruetz Rat Mod, and see what you think. Google it, read it twice, have a nap, and then read it again. If you still want to do it, that's not too difficult to accomplish. After that, it really sounds like you'll wreck the board trying to figure out what else you think you want to do, and ruin a pedal. Notice I didn't say a perfectly good pedal. Try the Ruetz Mod first. |
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larry greenwood
Copper Member
Malaysia
42 Posts |
Posted - 03/30/2010 : 08:21:58
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thanks for the info
i think i'll do the ic socket first, see what happen
the Ruetz Mod seems like really easy to give a try
i read on this page http://www.diyguitaramp.com/rat.html
it talks about frequency and gain
hope someone here can tell me in simple way how did it affects the tone
in malaysa there is a place where pedal can be modified
but it's far from my place
plus i do have basic solder/desolder technique
just need a piece of help from experts in this forum
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ranjam
Bronze Member
Canada
82 Posts |
Posted - 03/31/2010 : 01:25:11
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Clip the resistor, and the ice-pick tone seems to go away. |
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Topic |
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need a help for my rat 2
