Ruby Amp high pitched noise

[Octavian]

Hi All,

So I breadboarded the Ruby amp according to the spec on this page TWICE, once following the schematic at the top of the page, and one following the perfboard layout lower on the page. Both times I just get a horrible piercing tone from the speaker. The volume affects the volume of the horrible tone and the gain affects its pitch. I've tried a JRC386 and an LM386N-3, I've tried a 2N5457, a J201 and an MPF102. I tried getting rid of the entire gain section, nothing seems to work. Any ideas what could be causing this?

Help! TIA!

[tubegeek]

I had a similar problem that went away after I shielded the in and out wiring and swapped the J201 for another.

Not sure which did it - I think I did both at once.

[Octavian]

I figured it out... and feel a little dumb. My wife was talking about the DGS - Director of Graduate Studies - and I think that made me swap the Gate and Source on the transistor.... twice.

I will try some shielded wire on the in and out - might reduce the hum!