Merlin High Gain Preamp + Firefly Output

Update 8/10/16: As the VVR was pretty pointless with this set-up I decided to remove the ability to control it with a pot. This freed up a hole on the front – I decided to put it use by altering the tone stack from a simple tilt to a Bone Ray with tilt and middle controls. I also put the 1st bright cap on a switch – makes things a little better at lower gains.

An updated schematic is here, with the original retained below. I’ve also added few extra pictures of the layout below in the gallery.

Updated Schematic


Updated Build Pics

I wasn’t happy with my FireFly so decided to implement Merlin’s High Gain preamp design coupled to the existing Firefly output stage.

I removed the Mid control from Merlin’s design (replacing it with a 820k/220k divider following his Medium Gain design) and kept with my tilt control instead of the Bandmaster stack (both due to space constraints). Made a couple of component changes here and there due to not having them to hand.

Also implemented a MV control before the power section.



Build Pics