Wabash - Bass Booster (= EHX - Mole, OEM, old version)  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
Post Reply
User avatar
mauman
Resistor Ronker
Information
Posts: 419
Joined: 17 Jun 2017, 20:01
Location: Texas, US
Has thanked: 424 times
Been thanked: 183 times

Post by mauman »

I got one of these in for repair, and noticed it was an OEM for David Wexler & Co (Wabash brand) made by EHX, but different than schematics I've seen for the EHX Mole (which was itself a reworked LPB-1 I believe.) I finally found a similar 1st generation Mole schematic over on Fuzz Central, with the Volume pot at the input rather than the output, but even that one is a bit different, so I decided to post this here for general interest. The CTS pot has a date of 15th week 1973, so it was made some time after that, and the font matches the script on 2nd generation EHX Moles although blue instead of black. Q1 is the same tranny EHX used in Big Muffs of the '73-'74 era (according to Kit Rae's chronology.) The 3904 Q1 in the schematic was just for my simulations, which were quite close to the bench test results. Mike
Attachments
IMG_20200610_194347.jpg
IMG_20200611_103157.jpg
LTSpice Schematic Bass Booster.pdf
(104.05 KiB) Downloaded 253 times

Post Reply