Kalamazoo Amp Field Guide: Reverb 12

Technical Overview

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[ Technical Overview ] [ Schematic ] [ Photos ] [ Modifications ]

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For more information on the Kalamazoo line, see the Kalamazoo web pages at http://www.rru.com/~meo/Guitar/Amps/Kalamazoo/ .

NOTE: I only recently bought one of these; I've started working on it, but it still needs some work. This amp is extremely picky about power tubes to sound good. The tone circuit in mine is very annoying; one control acts almost like a volume control, and much of the knob range isn't very useful.

Vital Statistics

Model: Reverb 12
Year manufactured: circa 1966

Controls:
FRONT:

• Two inputs (one channel)
• Loudness (volume)
• Treble (with on/off switch)
• Bass
• Frequency (tremolo)
• Depth (tremolo)
• Reverb (depth)

Back:

• 300W AC receptacle (two prong)
• External speaker - 8 ohm (1/4" phone jack)
• Phono/tape input (mono, RCA phono jack)

Tubes:

• 12AX7/ECC83/7025 (dual triode) preamp stage 1 and tremolo oscillator
• 12AX7/ECC83/7025 (dual triode) preamp stage 2 and phase inverter
• 12AX7/ECC83/7025 (dual triode) reverb driver
• Two 6BQ5/EL84 output tubes (push-pull)
• solid state diodes for rectifier

Output Transformer:

• Unknown

Speaker:

• one CTS 10", 8 ohms with "extra heavy" 10 oz magnet

Physical detail:

• 1/2" plywood cabinet with metal corners, small rubber feet, standard vinyl handle, standard Kalamazoo tolex
• light gauge, one piece chassis with graphics silk screened on face
• point to point construction

Miscellaneous:

• schematic and tube layout chart pasted inside amp on lower back panel

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[ Technical Overview ] [ Schematic ] [ Photos ] [ Modifications ]

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Last updated: 14 September 2005

Copyright 2000 Miles O'Neal, Austin, TX. All rights reserved. Amp photo courtesy of Antonio Salvatore .

Miles O'Neal <roadkills.r.us@XYZZY.gmail.com> [remove the "XYZZY." to make things work!] c/o RNN / 1705 Oak Forest Dr / Round Rock, TX / 78681-1514