Pierson Amplifiers - Tweed and Custom Guitar Amps

Craftsmanship and Quality

Quality is my number one goal. My amps are made to be reliable on the road and in the studio. Here's a list of important quality factors in order to make high quality vacuum tube guitar amplifiers:

  Tweed Family  
     

 

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

Cabinet

  • 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

Chassis

  • High Grade Stainless steel, less magnetic interferences (LESS HUM, LESS NOISE) and rust proof
  • 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

Resistors  

  • 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

Capacitors  

  • High quality Copper Foil or Solen Fast (made in France) coupling & decoupling caps
  • Sprague Electrolytic Sprague or  CDE (made in USA) for filtering caps
  • highest quality and durability
  • Key ingredient to the vintage tone - modern polypropylene film caps sound too bright
  • 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

Testing 

  • 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.


Speakers  

  • Jensen Speaker come standard with every Pierson Amplifier
  • Celestion, Eminence, Weber, JBL and other speakers are available upon request.

Tubes

    Vintage tubes, NOS tubes fully tested and selected according to the player's style (blues, rock, country etc.), most are USA made (RCA, GE, Tung-Sol, Sylvania) apart from Mullard ( UK) and Telefunken ( Germany)

 

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

info@pierson-amps.com

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