Foxtrot 9 Audio'Trick-Shot'usedFoxtrot 9 Audio 'Trick-Shot' Custom WE437 / 6S45P-E Single Ended Stereo AmplifierThe Trick-Shot 6S45P-E / WE 437A Amplifier is ready for a permanent home. This has been a fun project for me, and exceeded all expectations for performance. The design and build process is pretty...999.00

Foxtrot 9 Audio 'Trick-Shot' Custom WE437 / 6S45P-E Single Ended Stereo Amplifier

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Condition
9/10
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Ships fromCentennial, CO, 80122
Ships toUnited States
Package dimensions19.0" × 19.0" × 12.0" (26.0 lbs.)
Shipping carrierUSPS
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The Trick-Shot 6S45P-E / WE 437A Amplifier is ready for a permanent home.  This has been a fun project for me, and exceeded all expectations for performance.  The design and build process is pretty well documented on my wordpress site here:


      http://foxtrot9audio.wordpress.com/trick-shot-we437-6s45p-e-amplifier/   

   
The Slicksheet Details are as follows:

  • 1 watt per channel Single Ended 6S45P-E or 6S15P Triode Stereo Amplifier.  WE437A supported via adapter.
  • 60Kohm input impedance
  • UTC Grid Chokes
  • LED bias
  • Tamradio (Tamura) Output Transformers.
  • 4/8/16+ ohm speaker compatibility.
  • THD (1KHz @ 1 Watt RMS) = 0.715%
  • Frequency Response (@ 1 Watt RMS): 20Hz to 20Khz +0.0/-1.0dB
  • Western Electric Cloth Wrapped Wiring.
  • CLCRC Power supply filtration.
  • High Frequency mitigation in both signal chain and power supply.
  • AC heater filaments
  • No measurable or audible power supply hum.
  • 120 or 220 V line input
  • Fused primaries
  • Separate Chassis and signal grounds w/ ground lift switch
  • Stainless Steel Fastening Hardware
  • Heavy gage Aluminum Chassis
  • Heat Cured Epoxy paint
  • Clean point to point wiring
  • Padouk Face panel.
  • Common cathode bias meter.
On the subjective side, I find that the amp will easily drive to room filling sound with 90dB+ efficient speakers.  Sound is the epitome of good single ended triode mojo.  Soundstage and imaging are excellent, without smear.  The sound floor is invisible – silent passages just roll off into inky darkness.  The sound is engineered into the design – just the right amount of even order harmonics and mitigation of odd orders.  Octave separation between the second and third harmonic is steeper on this amp than on anything else that I have built to date, and you can hear it in the results.  Plenty of warmth, but with clarity, not the soupy sweetness that comes from overdoing a good thing.  Perfect balance between accuracy and art.  I can without shame admit that this is the most glorious 1 watt of triode output that I have been able to create in my 10+ years of building amplifiers.  The extra work that went into signal integrity and noise reduction paid off in spades – the noise floor is sonically non-existent, and interference and hum have been banished as well.  For details, I implemented separate isolated grounds – a ‘clean’ common power and signal ground, isolated from the ‘dirty’ chassis ground that also services the signal shields.  Given that everyone has different setups and preferences, I have also added a switch that can be used to tie both grounds together, as well as a ground lug (chassis dirty) for you to use if using isolated input grounds on your preamp or phono stage.
Tube cathodes have a ferrite block, and each of the pair of grid pins has a separate grid stopper resistor.  Wiring is clean and logically routed to avoid noise and hum pickup and interaction.  Heaters are AC, with a 100 ohm reference back to the ‘clean’ ground.
I also credit a good portion of the sonic mojo to the grid chokes used in place of grid leak resistors – compared to other iterations of this circuit that I have built that did not implement grid chokes, this one just has a bit more air and soundstage.

The esthetics of the system came out pleasing to the eye as well.  I wasn’t sure about the red Padouk faceplate contrasting with the darker chassis tones, but once it was mounted with the current meter installed, I knew it was going to work.  I like minimally processed wood finishes that build character with time. This one came straight off the planer and was treated to a single light application of IPA followed by a stretched application of flat tung oil.  This ensures it will continue to patina as it ages, taking on a darker and richer hue.

This has been my main reference amp since summer, but with the weather driving me back indoors for the winter, it is coming time to say goodbye to this faithful friend to fund the next project.

The amp ships as new in plug and play condition. Includes 1 pair of generic Soviet era 6S45P-E triodes and a new IEC power cord.  Buyer is responsible for actual postage and insurance.  I will cover new and substantial packaging supplies.

I accept just about any rational form of payment, including Paypal. Since I don't have the trust level with  Paypal (or Audiogon, for that matter) to give them unfettered access to my bank account, I cannot offer Paypal integrated within this listing, and will have to invoice you for Paypal and credit cards separately.  

I am always happy to correspond and answer questions via email @:
[email protected]         mailto:[email protected]
http://foxtrot9audio.wordpress.com/

Thanks for looking!





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