TC Integrated Preamp Clone Noise/Feedback Problems

[rudeez]

Hi.

Just finished my veroboard clone of the famous TC Integrated Preamp.
Vero i used was this : http://www.aronnelson.com/gallery/main.php/v/slackers-stuff/tcpreboardfinal.jpg.html
The boost itself sounds great, but i have problems with wierd feedback, it's almost like a tremolo effect to it.
Listen to the soundclip below and you get what i mean:
http://dl.dropbox.com/u/2828668/tc-preamp-feedback-test.wma

I used 25K rev/anti-log pots instead of 22K ones since they were pretty hard to find.

What might be the issue here that makes this sorta tremoloeffect feedback?
Any ideas on how to cut that out as well as maybe make it a bit less noisy?

Also did another test with more playing:
http://dl.dropbox.com/u/2828668/tc-preamp-test-2-jet-king-big-bottom.wma

Happy christmas!

/Jimmie