In 1988 this amp was sent to Studio Electronics (Tim Casswell) An Extra gain stage and Additional Pre 2 (Push/Pull) was added that allows you to get More gain at a low volume, This amp is Hardwired to 16 ohms (Cab) It can be undone But it is soldered to 16 ohms, Additionally although an additional Gain stage was added, This amp can still run Stock,To engage the extra gain stage Simply pull out the pre 2 knob then set the amount of gain to taste.

The preamp tube Socket holder V2 is a little shaky due to the original rivets Coming loose, I took the tube protector off to show which socket it is. Its best to hold the base of the socket with one hand and take the tube out with the other hand.

The amp runs and sounds Great, Everything inside and on the amp is Original (Except for the Casswell mod)

Furthermore Tim Casswell wrote his name inside the amp on the Tag, I also have the usps shipping receipt that shows the amp was sent to Studio Electronics in 1988. 

*Tim Casswell is a Legend in the field, His work can be heard with artist like Slash, Lynch, Among many others back in the day, As well as his work with Soldano.

I will take the Output tubes off and wrap them for safety prior to shipping in a small box.

Any Questions/Pictures Email me.

Thanks,  Ross