BASS BOOSTER

Certainly an OEM by EHX, they made other units for Wexler under the Wabash name. It's a modified 1st generation EHX Bass Boost/Mole with 22 dB gain @ 30 Hz. The volume pot is at the input, not at the output like the later Moles. This unit has a CTS pot with a date code of 15th week of 1973. Q1 is marked FS36999 327, which according to Kit Rae's website on Big Muffs makes it a custom Fairchild 2N5133 301, and I estimate the Hfe ~220.