Thanks for the recommendation, added to the list and will give it a whirl!Depending on what the NE5532 is doing in the circuit, the LM4562 is a drop in replacement and sounds cleaner and more dynamic to me.
Easy and cheap to try
Alan
Are there any in particular that stood out to you when you did tinker?It's traditional for the measurements-are-all brigade to insist that the 5532 and related chips are perfect and can't be improved on.
If this is true then I'm puzzled why so many manufacturers have designed better chips...
I've not juggled op-amps in years, but one thing I'm certain of is that almost anything sounds better - a DIP socket and pocketful of affordable chips should be instructive.
I'm looking around for film caps now as the Azur 340a already includes 2 caps to ground on the + and -, do you know of any specific brands/models I should look out for because at the moment I'm only seeing ones that'll be far too large to drop inLM4562 has a really-nasty susceptibility to incoming RF noise; depending on what use you are putting it to - it may not be what you are looking-for. I don't care for it myself.
With the NE5532/34 - the key to good performance was identified by Doug Self : it's to ensure there is 100nF of film cap as close as you can, across the +/_ supply pins ( i.e. across the supply rails, right at the opamp)
Which raises the wider pont: if you are playing with opamp swaps- you are playing with coupling/ bypass cap requirement strategies , as much as opamps. For best performance these things are not plug & play - esp if you are using sockets!
Are there any in particular that stood out to you when you did tinker?