[sdiy] Arp 2600 replacement op amps

[James Patchell]

It depends on what the LM301 was used for...

If the LM301 is in a DC path (CV summers, etc.), I would leave it 
alone.  The DC performance of the LM301, while dated, was still pretty 
good.  You will have a hard time improving on that.

For audio paths... TL07x would be fine...

TO-5 to dip...yeah, there are converters out there...not cheap though.

My personal opinion...if there is no reason to change it...don't do it.

I would not consider, in general, a CA3140 as an improvement over an 
LM301... The main thing the CA3140 has going for it is the low bias current 
and speed...the LM301 has much better DC performance.  Using a CA3140 in a 
DC summer would degrade the instrument, rather than improve it.

At 01:07 PM 10/1/2006 +0100, James Dunn wrote:
>Hi all,
>
>I want to replace the 301 op amps in my 2600 with better ones - I've 
>looked through the synth-diy / analogue heaven archives as well as the 
>music machines website and they seem to recommend LF411 or similar FET op 
>amp. I am also aware that I would need to disconnect the frequency 
>compensation caps. as modern op amps have this internally.
>
>My question is: where can I get some op amps that would be suitable BUT in 
>a metal can? There are some metal can CA3140's on ebay, but they're not so 
>cheap, and I will need lots!
>Or, is there such a thing as DIL to TO-5 package socket converter?
>Or do I have to have to insert loads of stripboard and wire DIL op amps in?
>
>Any advice gratefully appreciated.
>
>James
>

         -Jim
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