Hello,
I have used this compressor, which I like a lot : it's much more "punchy" and squashy than other guitar compressors that i have tried.
It's quite noisy, and it kills much of the bass, but it sounds good (definitively
not in the transparent way !).
It uses a metal can CA3080.
It seems it is the same as the VOX 1903 comp ?
I wish I could build one, and maybe tweak it a little bit so it would be more bass friendly and expectfully less noisy :)
Here are some informations i have gathered :
http://www.effectsdatabase.com/model/guyatone/box/ps103#pictureshttps://www.guitargear.net.au/discussion/index.php?topic=37058.0http://www.guitarraonline.com.ar/img/circuitos-efectos/vox_com.gifhttp://www.guitarraonline.com.ar/index.php?sec=507http://www.madbeanpedals.com/forum/index.php?topic=13833.0