Pierson Amplifiers - Tweed and Custom Guitar Amps

Tweed Bassman Detailed Description




  • Model #: 5F6-A
  • 45 Watts
  • Class AB
  • Fixed Biased

Hand Wiring

  • Each amp is hand wired on vulcanized fiber tag board insuring durability
  • solid cloth covered wire like the original (as opposed to stranded plastic coated wire) -- a must for a vintage, sweet tone
  • Outstanding wiring techniques for a neat and clean look, less hum and less noise
  • Circuit: 5F6-A


Bassman 4x10 Combo (5F6-A1)

Dimensions: 23 1/2 " (H) x 22 5/8" (W) x 10 1/2" (D))

  • Finger jointed solid pine
  • Strong, durable
  • Great natural resonance
  • Hand Varnished Airplane luggage stripped Linen ( the exact material used for the original tweeds) for a natural vintage looking and feel, durable, washable


  • High grade Stainless Steel screws
  • High grade Stainless Steel aircraft locking nuts for less vibration
  • Industrial quality glass filled tube sockets, no rattling noise like NOS style counterparts. Tubes can be inserted and removed thousand of times
  • All grounds are done with 18 gauge stranded wire, translating in LESS HUM, LESS NOISE


  • High quality Carbon composition, important ones are usually NOS Allen Bradley or Riken Ohm (Made in Japan) high precision, gold plated copper leads.
  • Each resistor individually measured before wiring to insure exacting tolerances
  • Low noise
  • High temperature tolerance
  • Extreme reliability
  • Warm sound -- unlike metal or carbon film resistors


  • High quality Jensen Copper Foil (Made in Denmark) or Solen Fast (made in France) coupling & decoupling caps
  • Sprague Electrolytic Sprague or  CDE (made in USA) for filtering caps
  • highest quality and durability
  • High quality caps are a key ingredient to the vintage tone
  • All caps are formed slowly with a variac for stability and less noise

Power Transformers (by Mercury Magnetics in California)

  • Highest quality transformers made by Mercury Magnetics
  • Hand wound, paper interleaved
  • Period correct voltages -- no cold, harsh, high plate voltages
  • Center tapped filament -- no heater hum
  • Available in 220V / 240 V / 100 V

Output Transformers (by Mercury Magnetics in California)

  • Highest quality transformers made by Mercury Magnetics
  • Manufactured using the actual Triad engineering data
  • Hand wound, paper interleaved on paper bobbins
  • High efficiency
  • Rich harmonics - astounding tone
  • Built to last forever
  • Tremendous bottom end, shimmering highs, a lot of headroom


  • Every component (resistor, capacitor, pots, etc.) is tested before installation
  • Every soldered connection is tested
  • Voltage checkpoints are verified throughout the circuit
  • I test every amplifier for a substantial amount of time (sometimes it's hard to stop playing ...) and listen for potential rattling, vibrations sweeping frequencies with an audio signal generator


  • Jensen reissue P10R AlNiCo is standard
  • Celestion, Eminence, Weber and other speakers are available upon request.


Output: (2) 5881 (6L6GC)

Preamp: (1) 12AY7 + (2) 12AX7 

Rectifier: (1) GZ34 (5AR4)    

Tubes are fully tested and selected according to the player's style (blues, rock, country etc.)

If you have any questions, do not hesitate to contact me at


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