Available in 6, 8, 10, 18, 25, 30 and 40 watts, these amps are not to be confused with generic tweed circuitry. The Harptone Series incorporates features that virtually eliminate feedback and allow the punch that you need to cut through the mix. The circuit runs a unique phase inverter which includes an adjustable feedback control. That coupled with low preamp / high power tube plate voltages, very specific power stage filtering and special coupling capacitor values is what makes these amps work extremely well for Harp.
Controls: Volume, Volume, Tone
Power Output: 6, 8, 10, 18, 25, 30 and 40 watts
Output Tubes: 2 or 4 JJ-6V6, or 2 JJ-6L6
Preamp Tubes: 1, 2 or 3 12AX7 / NOS JAN 5751
Rectifier: 5Y3, 5V4, 5R4,5U4, or 5AR4/GZ34
Transformers: Custom crafted in the USA
Bias: Cathod or Fixed/Adjustable with external adjustment and test points
Configurations: Head, 1x10, 1x12, 2x10, 3x10, 2x12, 4x10, 1x15 Combo
Head: 21" W, 10" H, 9" D; Weight: 24 lbs
1-12 combo: 21" W, 21" H, 10" D; Weight 32 lbs.
2-12 combo: 23.5" W, 22.5" H, 10.5" D; Weight 36 lbs.
Speakers: Usually ships with Weber 10/12/15A125-O with "H" dustcap.
Inside the HT18112 and HT30212
Chassis: Chrome plated and silkscreened CRS
Circuit Board - Handwired G10 epoxy resin board, tinned brass eyelets, mounted on aluminum standoffs.
Wire: 18 & 20ga solid cloth covered vintage style
Capacitors: Sprague atom electrolytics; Sprague 715 OD, STK and CDE silver Mica coupling and tone caps. Paper and oil throughout optional
Resistors: Carbon Comp, Metal Film and Oxide throughout
Sockets: Ceramic chassis mount
Potentiometers: Alpha high friction
Switches: Carling
Jacks: Switchcraft
Channels: two channels, bright and normal, no switching
Mike Smith with his Harptone 30CB212
Configuration: Any speaker combination is available with any amp(TT-6115 Etc.)
Speakers: Ships with Weber "H" Dustcap 10A100/125, 12A100/125, 15A100/125 Only
Paper in Oil coupling and tone capacitors
Carbon Composition resistors
Channel Tie Switch - Internally jumpers Normal and Bright channels making them both active at the same time
Low Gain Preamp Switch - Emulates the gain of a 12AY7 tube in V1 position, amp ships with a 12AX7 in that position
Half Power Switch - Available on any four output tube design
Cathode Bias Resistor Selector Switch - Available only on Cathode Biased designs. Allows two or three different
cathode resistor/bias selections for the output stage resulting in different output wattages
Negative Feedback Loop Control /Switch - Available on any design that normally has a negative feedback loop, and a NFB
loop can be added to designs that do not originally have one. Available in potentiometer or selector switch
PAB - Pre Amp Boost switch, Bypasses the tone stack for a large gain boost, available in potentiometer or fixed boost selector switch
Balanced Line Out - Available in XLR jack with volume and tone controls
Line out - Available in 1/4 mono jack
Multiple Impedance Output Transformer - Available on any design and comes with a selector switch. 2/4/8 or 4/8/16 ohms available
Logo: Brushed gold, silver, black - Cabinet mount traditional style or grill cloth mounted oval and rectangle
Handles: Vintage style Brown or Black leather strap with chrome mounts or modern style with dog bone mounts
Feet: Original chrome glides or 1" Rubber
Speaker Wire: Actual Vintage(not vintage style)cloth covered 16Ga or BlueWave Audio oxygen free 16Ga
Cabinet Coverings: All available Tweed and Tolex options are listed here
Grill Cloth: All available Grill Cloth options are listed here
Chickenhead Knob Color: All available knob colors are listed here
Tweed tint options are as follows:
HT18112 in level 2 tint
The following are examples of popular configurations, if you need a quote on a specific configuration please ask.
Legend: CB - Cathode Biased FB - Fixed / Adjustable Biased FC - Feedback Control V - Volume(2 = Normal and Bright channel) B - Bass M - Middle T - Treble P - Presence + - Adds a Middle control where the original only had Bass / Treble, or B,M,T P where original only had a single Tone control