Oscillator Devices Imp 2nd gen – MIDI Mod in the version Imp-SPST for upgrading effect devices with single non-latching SPST switches.
Further information at https://oscillatordevices.com/imp.
The Imp-SPST is available with a soldered-on socket (variant Socket assembly) or for use with a separate socket (variant No sockets).
For installation in a JHS Morning Glory v4 choose configuration “Morning Glory”. This includes all configurations and the BS170 like seen in this video.
IMPORTANT! Assembly aids, seperate sockets, etc. are not included in the scope of delivery and must be ordered separately.