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TubeHead Owner's Manual

Keith Harris
Updated

Tube Headphone Amp

6K4 Tubes / 16-300 Ohms / 180mW

 

Includes

  • 1 x headphone amp
  • 1 x 12V 1A US power supply
  • Manual and warranty card

 

Functions

  1. Power Indicator LED
  2. Power Switch
  3. ¼˝ Headphone Out
  4. Volume Knob
  5. RCA Line In
  6. Selector Switch: Line 1 / Line 2 
  7. 3.5mm Line Input
  8. DC 12V Power Input
A technical line drawing showing the front and rear control panels of the Rockville Tube Head vacuum tube headphone amplifier with numbered callouts 1 through 8: Front Panel (Top View): Two vacuum tubes extend upward from the top of the chassis. 1: Power Indicator Light: Small LED indicator located under the power switch. 2: Power Toggle Switch: Vertical toggle switch labeled "POWER". 3: Headphone Output Jack: 1/4-inch (6.35 mm) headphone jack marked with a headphone icon. 4: Volume Control Knob: Large rotary dial labeled "VOLUME" with negative (-) and positive (+) indicators. Rockville Logo & Branding: Labeled "ROCKVILLE | Tube Head" in the top center. Rear Panel (Bottom View): 5: LINE 1 RCA Inputs: Dual RCA input jacks for Right (R) and Left (L) channels. 6: Input Selector Switch: Sliding toggle switch to select between "LINE 1" and "LINE 2". 7: LINE 2 Input Jack: 3.5 mm auxiliary input port. 8: Power Input Port: DC 12V barrel jack power connector with polarity diagram.

 

Operation

A technical wiring diagram illustrating audio signal routing and peripheral connections for the Rockville Tube Head amplifier: Audio Output Connection (Top Right): A 1/4-inch headphone plug connects directly into the front panel headphone jack. The cable routes to a square callout box containing a headphone icon, indicating output to headphones. Audio Input Options (Middle & Bottom): The rear panel accepts audio input via two alternative setup paths connected by an "OR" selector bubble: Line 1 Connection: Red and white L/R RCA cables plug into the rear RCA input jacks. Line 2 Connection: A 3.5 mm auxiliary cable plugs into the rear 3.5 mm Line 2 jack. Supported Source Devices: Both input options lead down to a rounded enclosure containing icon representations for four compatible audio source devices: Computer (Desktop monitor) Laptop MP3 Player Smart Phone

 

Replacement Tubes

This tube amp uses 6K4 tubes. 

If you are unable to aquire 6K4 tubes, you can use any of the following models:

CV2521, CV2522, CV4011, CV848, CV850, EF93, EF94, EF95, 403A/B, 5654, 5749, 6136, 6AC7, 6AG5, 6AH6, 6AK5, 6AN5, 6AS6, 6AU6, 6BA6, 6BC5, 6BC6, 6BX6, 6DA6, 6F36, 6J1, 6J2, 6J3, 6J4, 6J5, 6K4, 6K5

 

Features

  • Tube: 6K4

  • RCA line input

  • 3.5mm audio input

  • ¼" headphone output

  • Perfect for 16 ohm to 600 ohm headphones

  • Power Output: 100mW@16Ω, 180mW@32Ω, 112mW@64Ω, 64mW@120Ω, 27mW@300Ω (@0.03% THD)

  • S/N Ratio: 106dB

  • Volume control

  • On/Off Toggle Switch

  • Line 1/Line 2 input selector switch

  • Gain: 1.89dB with 0.775Vrms input @ 32ohm impedance

  • Crosstalk: 70dB

  • DC Power Supply: 12V 1A

  • 110/220 switchable for worldwide use

  • Unit Weight: 1.02lbs

  • Unit Size: 3.94 x 3.74 x 0.9 inch (L x W x H)

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