Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: eojcam on July 20, 2012, 01:13:17 am

Title: crate v 18 makes weird harmonics when 2 notes played
Post by: eojcam on July 20, 2012, 01:13:17 am

did this:


CRATE V-18 MODS:

1- Change R3 to 100K

2-Swap out R4 and R10 (R10 becomes 2.2Meg and R4 is 470K)

3- Change R5  to 2.2K

4-Add 250pf (Silver Mica) cap to gain pot

5-Change C10 to 47pf (Silver Mica)

6-Change C12 to 250pf (Silver Mica)

7- Change C14 to .1uf

8- Change C15 to .047uf

amp now produces ring-mod like sounds when bending to a unison or
playing 5th intervals.............thinking it might be i need to change the gain
resistor to a lower value.
any ideas appreciated.
thanks

Title: Re: crate v 18 makes weird harmonics when 2 notes played
Post by: Tyrannocaster on July 20, 2012, 07:31:35 am

http://www.el34world.com/Forum/index.php?topic=14119.0 (http://www.el34world.com/Forum/index.php?topic=14119.0)