Sunn Model T reissue squealing

[nsubulysses]

I tried and tried to locate the squeal and I could not.

Then I tried somthing like in this thread and put a 2000pF cap across R3 and it stoppped the squeal

http://music-electronics-forum.com/t38879/

[pdf64]

Pleased you've fixed it, but 2pF ? Really, that small?

[nsubulysses]

After I posted that I realized it was wrong and was hoping no one noticed so I could edit my post

2000pF

[GainFreak]

Does anyone know what type and/or brand are those brown coupling capacitors?