NOTE: I do not currently own one of
these. These photos are courtesy of Kagang on eBay, fellow
Kalamazoo lover and friend Rob Murray, and
someone else on eBay whose name I have lost 8^(.
Click on any photo to see a larger, more detailed JPEG. |
Bass 30 and 50 |
Basic front shot. |
Closeup of nameplate badge. Bass 50 would be
the same, but say 50 instead of 30. |
Back with control panel flipped out. |
Closeup of standard Kalamazoo controls
(loudness, treble/on/off, bass).
Bass 50 would be the same, but say 50 instead of 30. |
Bass 50 chassis and panel, layout, iron, etc. Owner has already replaced the can caps. |
Bass 50 panel closeup. Standard Kalamazoo Bass flipout panel. |
Bass 50 chassis guts. Round, gray-green things in upper left are power supply diodes. Speaker jack is on the right. |
Bass 50 closeup of pot wiring inside panel. |
Bass |
Basic front shot. The only clue that this is the
later solid state model is the badge, which doesn't
even say "Bass". |
Closeup of standard Kalamazoo controls
(loudness, treble/on/off, bass).
Again, the only clue that this is the solid state model
is that no number appears after the "Bass". |
Last Hurrah Bass 30 |
When the Kalamazoo line was redesigned with the
woodgrain look, they redesigned the bass amps as well,
resulting in what looks like Baul Bunyan's Kalamazoo Model 2.
Farewell, flip top box! This tall sucker was manufactured
in 1970. Gibson also produced amps under its own name in this format, such as the Thor and at least
one of the Medallist designs. |
This was not a well ventilated amp, even with the back off the amp section. Note the cab is still
a sealed design. Gotta love that huge transformer! Rob
kept the cab to this one and installed new speakers,
but sold me the electronics. This must have been top heavy,
because the electronics were heavy!. |
Other than the power switch, the faceplate looks
amazingly like the Model 2. This isn't the original switch knob;
the original should match the other knobs. Note that the company
headquarters is now listed on the faceplates as Lincolnwood. |
Here's the back of the control panel. The two bundles of wires go to
Molex connectors that connect to the main chassis. The ceramic cap is the infamous Death Cap.
Everything is original except the caps and the fuse holder and its red wire. |
Detail shot to show construction. The Loudness and Bass pots both have terminal strips
soldered onto their backs. This may or may not have contributed to the Loudness pot breaking
from its mounting threads.) The power switch has a regular pot switch (SPST for on/off) on
the back of some sort of ceramic wafer switch that handles the polarity switching. I have
no idea where the cut blue wire went. |
Here's the main chassis from the top. Big iron! Six of the nine pins in this Molex connector
carry signal to and from the front panel. The preamp/PI socket is at the bottom; the post-PI driver
tube sockert goes in the middle, and the octal sockets are for the power tubes. Power comes out
the right end of the chassis; the power connections to the front panel come out the side that is
at the top of this photo, via red, black and white wires just visible at the upper right (via a
three pin Molex connector). The original speaker socket is a two pin Bakelite[tm] connector on
the left end of the amp; I added the phone plug you see above the output transformer to handle
standard speaker connections. |
Here are both chassis together to get an idea of the relative sizes. |
The usual Kalamazoo Snake Pit[tm]. It's fine for the low gain and volume of playing
bass or clean guitar, but driven hard with a pedal, there are some nasty parasitic oscillations. |
The amplifier guts. The two prong socket on the left is the original speaker jack. (The
orange and white wire between the speaker jacks is from the heaters of a Kalamazoo Reverb 12. 8^)
The trim pot at the lower left is a hum balance pot for the power tube cathodes. The three dark wires
at the "top" side of the Molex connector are grounds; the cable that plugs in uses three shielded
wires. |
The original PS caps were also 450WVDC, which is at the edge; the plate voltages are just
over 450VDC. The green box in the middle is a full wave rectifier. I have no idea why they
didn't just use two diodes. |