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Dynakit / Dynaco ST-35 Tube Amplifier "Special Order"

Dynakit / Dynaco ST-35 Tube Amplifier "Special Order"

Regular price $1,300.00
Regular price Sale price $1,300.00
Sale Sold out
Shipping calculated at checkout.

Our "special order" units are available for (pre-paid) purchase but require a 3-4 week waiting period. This gives us time to order the parts and options you've selected then assemble and test the unit. There are component varieties, combinations and brands we have found to be top performers so you "pick and choose" from these and we build you a great sounding amp around them.

The photos shown are of previous units to provide visual examples. Generally speaking, most units look very similar when completed but your specific unit will have all the special features you have chosen.


You are not required to purchase the tubes from us, but we'd appreciate it. Your amplifier will still be fully tested, but it will ship without tubes, unless you purchase the tubes from us.

The ST-35 uses the tubes listed below.

  • (4) EL84 / 6BQ5 Power Tubes
  • (2) 7247 / 12DW7 Driver Tubes

Standard Features Include:

  • Original Non-adjustable bias
  • Metal Film Resistors
  • Screw Terminal Outputs
  • Cornell Dubilier 940 Series Capacitors
  • Polished stainless steel chassis / cover included
  • (Optional Nickel plated steel chassis available)
  • PA-774 power and Z-565 output transformers
  • Dynakit circuit boards with Belton tube sockets
  • Cornell Dubilier (CDE) 940 Series Capacitors
  • Upgraded chassis feet included
  • All models include the C-354 choke
  • All models include an inrush current limiter
  • All models include a 6A power switch

Options and Upgrades for the ST-35

Bias Control for ST-35

 click here ➡

Resistor Upgrades for ST-35

click here ➡

Capacitor Upgrades for ST-35

click here ➡

Chassis Options

click here ➡

Binding Post Speaker Terminals

click here ➡

Tubes for the ST-35

click here ➡

Often considered the best sounding of all Dynaco amplifiers. Despite endless and elaborate descriptions you hear about tube audio, there is no real way to convey the actual sound and experience in words. To me, tubes sound natural and more realistic. The presentation is vibrant, alive and soothing, extended periods of listening are a pleasant experience. Nothing in the recording is left out, and nothing is added. The magic is that you hear it all without any harshness.

⭐ watch a video review on one of our ST-35 builds

Utilizing solid state rectification, independent circuit boards for each channel, EL84 output tubes and a dual triode driver stage, the ST-35 is nothing short of amazing. The holographic detail, warmth and sparkle of the ST-35 makes for an unforgettable "tube audio experience".

Includes the Dynakit C-354 choke which drops the noise floor substantially.

The standard build uses one Illinois Capacitor (.22uF@630V) radial leaded Metallized Polypropylene Film capacitor and a pair of axial lead CDE 940C (.1uF@600V) Metallized Polypropylene Film capacitors. See the upgrade options if you prefer something different.

The circuit boards include upgraded Belton tube sockets.

The four section filter capacitor is hand polished for improved appearance.

The current production transformers are made for modern day voltages, you do not need a voltage reducer like you would with a vintage amplifier.

The stock build ST-35 utilizes cathode follower bias so there's no checking, setting and adjusting needed. The Bias Balance Control can be installed on your Dynakit / Dynaco ST-35 special order build. If you want to be in control of the bias and have individual tube biasing.

A 6 amp toggle switch is included, located on the back. The ST-35 never had a power switch, the amp was designed to plug into the switched accessory outlet on your preamp. If you want to control this amp like that, just leave the power switch in the on position and plug the amp into an adequately rated switched outlet on your preamplifier. The amp will come on and shut off with the preamp.

There is a thermistor / inrush current limiter (CL-90) installed to provide a more gradual, transformer/tube friendly power up.

The amp is fully wired with 600 volt rated stranded wire and soldered with Kester eutectic 67/37 eutectic solder.

Includes original style screw terminals for the speaker connections for both 4 and 8 ohm capability. You can upgrade to binding posts which allow use of banana plugs or bare wire if you choose but you will only have either 4 or 8 ohm output capability with binding posts due to space restriction of the chassis openings. 
  • Includes Upgraded "Gold" RCA inputs.
  • Includes Upgraded "oversized" rubber feet for a great looking and solid stance.
  • Includes the cover in Brown or Black, your choice.
The Dynaco ST-35 Tube Amplifier provides the ultimate in audiophile quality and sonic satisfaction. It is simply one of the best tube amplifiers available. This timeless classic is crafted with modern components and old world engineering.  The two technologies converge to produce an exquisite soundscape. This amplifier offers an unparalleled musical experience that will elevate any audio setup.

Manuals, biasing instructions and initial set up printouts / diagrams all included. Email and phone support provided if needed.

  • ST-35 Dimensions:
  • 13" Wide X 5.5" Deep X 4" Tall
  • Height may be slightly higher (+1/2") with larger feet installed
  • Weight about 16 lbs. (unboxed)

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Your system can only be as good as its "weakest link". Quality components (preamp, amp, tubes, speakers, cables, etc.) are the only way to ensure top notch sound and performance from your stereo system.


All products ship FedEx Ground unless other arrangements are made. All shipments are insured for their actual value. All shipments will require a signature at time of delivery. Ready to Ship orders go out in 3-5 business days. Special Order units ship in 30 days or less. Please see our shipping policy for more information.