Finished Gibby GA77 scratch build

[Willabe]

As you're talking about low note distortion, and, at times mud,,,, I can't help but think about lowering the values of your cathode bypass caps...

I ordered a few small value bypass caps from Doug last night and their already on their way! Thanks Doug!


                  Brad   

[lego4040]

  That is a hell of a build there. You really put some thought into that amp and I'm glad its sounds as good as it looks. Who did your face plates? I'm gonna need some for my build. You dont see folks building Gibson amps much either

[Willabe]

Thanks.   

I drew them up on Sch. and sent them to a friend at church and he used a better graphics program to finalize the.

Then I sent the files to a local (trophy/badge/sign) engraver.


                  Brad      

[Willabe]

I got a few parts from Doug yesterday but the e-caps (an F&T cap can and an F&T axial) I got to try and see if they fit will not. I'll use them in something else.

My problem is I used all 450v radial E-caps. When the amp is loaded the B+ at OT CT falls to ~420vdc, but when in standby or with no tubes in the dang B+ rises to 480dcv.        

I didn't think it would rise that hi with a PT of only 150mA B+ wind. I should have figured it would rise higher than 450dcv with the B+ wind at 360-0-360 unloaded.

So I just ordered a few radial caps at 250dcv/82uF and will stack them for 500dcv/41uF. That will at least fix it for the standby mode.

I did leave the amp in standby for ~10 minutes by mistake and the Panasonic caps didn't blow up or get hot to the touch.

I think I'll try and rewire the TS today.


                    Brad