David Bogen - Model JOH-JOL - Pre-Amplifier - Original Service Manual - 1954

David Bogen - GO-50 - Amplifier - Original Service Manual -1947

David Bogen - Model jx30 - Amplifier - Original Service Manual - 1954

David Bogen - Model j50 - Amplifier - Original Service Manual - 1954

David Bogen - Model G-50 - Amplifier - Original Service Manual - 1947

David Bogen - Model GO-50 - Amplifier - Original Service Manual - 1947

Masco - Model TVB - Amplifier - Original Service Manual - 1954

Grommes - Model LJ-2 - Amplifier - Original Service Manual - 1954