Capacitor

I agree with Millercarbon! Good advice. 

@grannyring

Yes you did. Apologies my train of thought went a little haywire. 

I have in the past also found bypassing on a coupling cap position can have unexpected results, but it’s generally been a mixed bag.

I do like the sound of my pre, much much more now after the VCaps. But the fact that it has 4 caps per side in the signal path is concerning, so further optimizing these is something I believe is worthwhile considering.

Yes indeed. Agreed. The Cutf .01uf and Odam do make magic together in electronics such as your Pre. I use the combo all the time in Orchid dac upgrades.  

There are a bunch of very good caps ,I have over 20 years between electronics ,and Loudspeakers , I have  Vh Odams in a dac. And in a speaker ,very good capacitors . Millflex copper paper poly oil caps very respectable .
but, I find Jupiter copper foil caps outstanding in image depth tone and Bass not perfect but very good on top , the best bypass capacitors higher then 100 volts 
Are without question the VH audio CU -Copper Teflon caps which are VH Audio best capacitors .I mixed roughly 2+% ,to the Jupiter
copper foil coupling caps in the preamplifier ,A great combination now it is open airy and have excellent precision as well as very natural musicality .
personally I like better then  any capacitor out there including Duelund .
everyone has a opinion but unless you have tried this combination ,you are missing a special combination.

I’ve committed to ODAMs so Jupiters are not in my future, but @jasbirnandra may be interested as he said he is going Jupiter.

I’m now pondering sizing the bypass. I see suggestions of 0.01uF and also 1% to 2%, which would be 0.033uF to 0.068uF.

I’m a "go big or go home" person, so I’m considering trying a single pair of 0.068uFs. If the sound gets a little zippy, I’ll leave the 2nd pair of ODAMs un-bypassed.