Re: Soldano X88R preamp

Posted by Ciaran Haslett on Mar 08, 2016; 6:52pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/Soldano-X88R-preamp-tp28669p28671.html

Hi Tim!

Great job! Based on values I assume you went with the High Gain Channel?  If so, there are a few problems (sorry)

1. Coming out of Q1...the 47n should go to a 220p not 220n (typo?)
2. The 220p on Q2 doesn't appear on the schematic
3. Coming out of Q2...the 22n should go to a 470K THEN to the Gate of Q3.  At the minute it goes to the Gate and the 470K is left in limbo. The 39K is on the Gate when it should be the source.  

If you move everything to the left you can shift the top leg of the 1M to the bottom of the 470K, cut between the 22n and Gate of Q3, and add a link from 1M/470K junction to gate.

4. Mid 3 labelled as 2.  No Bass Cap?.  Treble 2 should go through the 330K then to Master 3.  Also 330K shouldn't connect to Treble 3.

These are all pretty simple fixes and congrats for going after a preamp on your first attempt!!!  I struggled with a buffer on my first go!

Well done!