Flanger repair - what should I be aiming for?

[DIY Bass]

I have repaired an Aria FL-10 Flanger.  It's an MN3207 based flanger.  I have never owned a flanger, , let alone an analog one, so just want to make sure the end result I have arrived at is correct.  It works.  There is clean guitar in the bypass, and lots of lovely flange when engaged.  The controls all do as advertised.  The little red light even lights up :-)  When I am running guitar --> flanger --> amp and the effect is engaged, and I am not playing, i can still hear a faint wooshing noise like I can still here some flanging. I am betting that a noise gate would kill it.  Is that standard or should I keep replacing bits to make it quieter (I didn't replace any electro caps for example, even though  the pedal is quite old because I didn't need to to get it working)?

[Mark Hammer]

The whooshing is common, and indeed, some commercial designs DO incorporate a noise gate to kill the delay signal when you stop playing.  Other noise-control strategies have included:
- more lowpass filtering on the BBD output (noting that some of the more highly prized flangers use less filtering so as to keep all the high end intact for when the unit sweeps up high)
- using treble pre-emphasis and de-emphasis (probably most common; the poorman's Dolby)
- using companding (mess common; the middle-class DBX)

However, some forms of noise control are sort of built into the normal use of the chip.  The two outputs - what I like to call "tick" and "tock" - need to be balanced in order to cancel out clock artifacts.  Some designs/makers simply use a pair of equal value resistors, while units that cost a little more will employ a trimmer on the output of the BBD to more optimally balance the two chip outputs, much like a humbucker pickup rejects audible hum by using two balanced opposite-phase versions of the same hum to cancel each other out.

[Dasher]

That sounds normal to me... but I guess it really depends on how loud the whooshing actually is. I own a Boss BF-2 that I can hear whooshing quietly when I'm not playing but it is MUCH quieter than the guitar signal would be.

[DIY Bass]

Thank you.  Sounds like what I have is pretty normal then.  I am not hearing clock noise, just a little bit of the wooshing sound, which is much quieter than the guitar signal - not really all that evident.  Sounds like I will leave it the way it is and make sure there is a noise gate handy.  Thanks all