The MP-1 has two channels labeled: Instrument & Mic. The 1st or Instrument channel has two inputs (high & low gain). A 12AX7 takes care of this channel's volume, bass and treble controls and 12AU7 is used to drive a reverb transformer and springs. This channel and the Mic channel are summed by a 12AX7. Half a 12AX7 is used for a cathode driven incandescent bulb, in the Tremelo's oscillator circuit, Do Not Contact the grid of this tube! If you do, I have some new bulbs. The 2nd or Mic channel has only volume and tone controls. The phase inverter uses a 12AU7 to drive two 7189A power tubes and the output transformer into a 12 in. 8ohm speaker. If you own one, Email and tell me more.

Approx. 27 Watts
Serial Number: Not available
Owner: FOR SALE contact: Taylors Music,
voice: 901-276-8900 Memphis, Tennessee.
Photo: ©1997 Zack. Used by permission.