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304tl Amplifier

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the 304tl amplifier shown on this site is optimized for use with 8 to 16 ohm high-efficiency speakers and has the following features.

  • a classic audio channel, in which half of a 6sn7gt dual triode drives a 304tl through an interstage transformer designed specifically for the 6sn7. with the 6sn7's 7,700 ohms plate resistance, the unloaded output of this interstage transformer is typically flat ±1/2 db from 20 to 90,000 hz. The amplifier uses no feedback.
  • all transformers are manufactured to the highest standards of quality, using typical military-standard procedures. Visible transformers are styled with end-bells and have similar appearance to the stancor, triad, thordarson or utc units of the past. However, the output and the plate transformer end-bells are potted. (detailed photo of an unpainted output transformer. ) transformers and inductors mounted below chassis use heavy machined aluminum frames and specially designed heavy-duty terminal strips.
  • direct current 10 v @ 26 a filament supply with choke-input filter (photograph).
  • 1,000 vdc @ 300 ma high voltage power supply with:
    • 866a mercury vapor rectifiers.
    • choke-input filter, three lc sections, and oil-filled capacitors.
    • 125 uf capacitor in third section. this capacitor stores 62. 5 joules.
      (photo of the high voltage choke assembly with magnetic shield removed. )
  • autotransformer control of both filament and plate voltage. This allows the user to warm the filaments slowly and to operate the amplifier at reduced plate voltage and dissipation if desired. a mechanical interlock between the autotransformers allows the knobs to be rotated only in the correct sequence. operation is fail-safe in the event of a power interruption.
  • front-mounted bias controls and plate current meters. this, together with control over the plate voltage, allows the operator to choose the quiescent operating point of the 304tls.
  • 12 gauge steel chassis, with extensive use of machined aluminum plates and mountings.
  • 3/8 inch thick borosilicate (pyrex) glass cover.
  • gain control and three inputs via pairs of xlr connectors, wired for unbalanced input in the ampex tradition.
  • convection cooling and quiet operation, with attention paid to audible hum which can be mechanically generated by power components.
  • frequency response ±1/2 db from 21 to 20,000 hz. (graph)
  • output and damping capabilities:
    • 50 vpp maximum.
    • 3 ohms effective source impedance.
    • 30 w/channel at 500 hz and 10 w/channel at 20 hz into 8 ohms at the 5% total harmonic distortion level.
  • voltage gain (no load) 10.
  • hum and noice less than 2 mvrms.
  • heat dissipation approximately 300 w plus 304tl plate dissipation, which is determined by the quiescent operation point chosen and is 300 w maximum.


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