Hamilton-Kolby PRO-15 Amplifier

The Hamilton-Kolby Pro-15 Amplifier is a premium quality, hand-made combo amplifier built in the 50's tweed tradition. Powered by a pair of 6L6GC/5881 beam power tubes, this combo amp delivers a solid low-end, exhibiting the rich tonal qualities of which only a pine-enclosed 15" AlNiCo loudspeaker and vacuum tube circuit are capable. Real chassis-mounted steel pots, SwitchcraftTM jacks, eyelet-board construction, and hand-soldered connections make this a rugged, reliable, and road-ready device. An optional reverb module provides classic "cathedral" ambience.

Hamilton-Kolby PRO-15R Amplifier

H-K VTR1 Reverb Module
with 17" spring reverb (medium or long delay)
Customer specified amp covering extra.
Customer specified loudspeaker extra.
Customer specified NOS or boutique tubes extra.
'59 Bassman phase-inverter circuit

Made in U.S.A.
Specifications subject to change without notice.


Power Output: 25 RMS Watts into 8 ohms
Circuit: "5E5A" Class AB push-pull output
Speaker: 15" Jensen P15N AlNiCo

Construction: Plated steel chassis; Hand-wired, vulcanized fiber circuit board with brass eyelets. Pine finger-jointed cabinet; lacquered Tweed Covering.

Inputs: 2 Normal; 2 Bright, 1/4" jacks
Outputs: 8 ohm speaker, internal and external, 1/4" jacks
Controls: Volume Normal, Volume Bright, Treble, Bass, Presence, Power On/Off, Standby On/Off, 3A "Slo-Blo" Fuse. Reverb option has reverb level control accessible at rear of amplifier cabinet.

Height: 21-1/4 " (22-1/4" to top of handle)
Width: 22-1/2"
Depth: 10-1/2 " at base; 9-1/2 " at top
Weight: 45 lbs.
Power Consumption: 120VAC, 200W

Tube Complement - Amplifier Section:
3 12AX7 Low-Noise Dual Triode
2 6L6GC/5881 Beam Power Tetrode
1 5U4G Rectifier

Tube Complement - Optional Reverb Module:
1 12AX7 Low-Noise Dual Triode
1 12AT7 Medium MU Dual Triode


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Hamilton-Kolby Custom Electronics
Acton, Massachusetts, USA


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