Ormagoden

Ormagöden is a custom-engineered, flagship 220-Watt cathode-biased tube monster bass amplifier head in the Thermionic Studios fleet. It is built explicitly for absolute volume worship. It will be available for rental for rehearsal, recording, and performance, within the Southern California area.

Technical Specifications & Architecture

Parameter	Specification	Engineering Notes
Topology	Quad Class AB Cathode-Biased Beam Power Tetrode	Optimized for dynamic, touch-sensitive sag, musical even-order harmonics, and a dense mid-range bloom.
Power Output	220 Watts RMS Clean / 240+ Watts Saturated Peak	Continuous clean floor up to 1% THD; pushes past into a soft, square-wave power tube distortion.
Power Tubes	4x Tung-Sol KT-120 Reissue	Massive 60-Watt plate dissipation rating per bottle, engineered to withstand continuous stage punishment.
Phase Inverter	1x Vintage 12BH7 Double Triode	Estate-sale vintage television vertical deflection tube running a Long-Tailed Pair layout. Low internal resistance ($ pprox$ 5,500 $\Omega$).
Driver Stage	2x 12AT7 Dual Triodes (Dedicated Quad-Triode Driver Deck)	Post-Phase Inverter Differential Gain Block. Each of the four triodes is independently dedicated to driving its own KT-120 grid, establishing an un-loaded 24:1 impedance leverage ratio.
Rectification	Solid-State Silicon Diode Bridge (4x 1N5408 / UF5408)	3-Amp / 1000V high-current gates providing zero rectifier sag. Keeps the B+ rail completely rigid to balance out the compression of the cathode furnace.
Cathode Bias Network	150 $\Omega$ Shared / 200W Top-Deck Gold Aluminum Array	Four 50-Watt gold-jacketed chassis-mount power resistors wired in parallel on the top exterior deck of the chassis plate.
Bypass Capacitance	470µF / 100V Electrolytic + MLCC Array	Massive low-frequency reservoir running parallel to the gold resistors to preserve deep, un-attenuated sub-bass transients.
Grid Leak Constraints	240,000 $\Omega$ Maximum Per Tube ($R_{g1}$)	Cathode-bias architecture safely expands the fixed-bias 51k$\Omega$ limit, preventing thermal runaway or grid-loading signal collapse.
Coupling Capacitors	Sprague 715P/716P Orange Drops (600V Polypropylene)	0.1µF off the 12BH7 phase inverter; 0.22µF off the 12AT7 driver plates to maximize low-frequency fundamental transmission.

Mechanical & Industrial Design

The physical build of Ormagöden completely rejects traditional, lightweight consumer amplifier enclosures, utilizing an industrial, heavy-duty structural layout that scales its total weight to an estimated 60 to 70 pounds:

• The 304 Stainless Steel Battleship Chassis: A thick 12-gauge or 10-gauge structural 304 Austenitic Stainless Steel deck pan built to support colossal transformer weight without any physical deflection, twisting, or mechanical warping.
• Top-Side Exposed Exoskeleton Bracing: Structural stainless steel angle reinforcing trusses are TIG-welded directly onto the outside top deck of the chassis sheet. The welding process leaves a raw, exposed, multi-colored titanium-like chromatic oxide "rainbow" patina (heat tinting) along the structural weld beads as an intentional aesthetic flex.
• The Quad-Tube Thermal Furnace Layout: Four KT-120 envelopes radiating up to 482°F (250°C) each are positioned adjacent to top-deck chassis ventilation slots to initiate a natural convective draft, pulling cool air through the bottom deck and dumping infrared energy straight out of the box.
• The Dual-Engine Iron Core Platform:
  • The Plate Engine: Standalone, high-current Ampeg SVT-class replacement power transformer delivering a continuous 1.0 Amp (1000mA) DC current rail.
  • The Filament Furnace: Dedicated 6.3V AC / 10-Amp auxiliary heater transformer oriented at an exact 90-degree perpendicular phase offset relative to the plate iron core laminations to cross-cancel electromagnetic stray fields and eliminate 60Hz inductive hum.
• The Enclosure Vault: A solid Baltic birch plywood floor and side-panel base fully upholstered in menacing, deeply embossed Red Croc Faux Leather. The front, back, and roof are wrapped in an unbroken, heavy-duty black steel expanded metal cage grate.
• Ergonomic Road Armor: Dual Reliable Hardware RH-6630 16-gauge Recessed Edge Handles are mechanically anchored across the top corner seams using structural steel backing washers and pop rivets, allowing a transport dolly or road crew to lift the monolith securely.

Internal Circuitry & Grounding Discipline

Because 304 stainless steel carries a significantly higher internal electrical resistance than standard aluminum, traditional chassis-grounding points are strictly forbidden to eliminate ground loops:

• Isolated Single-Point Star Ground Bus: A heavy-gauge, continuous piece of bare copper wire runs entirely across the tube sockets to act as an isolated ground rail. Every single preamp, driver, filter, and cathode ground links directly to this copper bus.
• The Chassis Ground Anchor: The solid copper grounding rail connects to the stainless steel chassis frame at exactly one single, dedicated brass bolt right next to the main AC power entry.
• High-Voltage Lead Dress: High-temperature, heavy-gauge Teflon-insulated hookup wires pass through rubber wiring grommets bored via cobalt/carbide tools to prevent the sharp edges of the stainless steel from chafing insulation.
• Post-Phase Inverter Master Volume (PPIMV):** Dual-ganged 100k$\Omega$ or 250k$\Omega$ audio-taper potentiometers are positioned between the 12BH7 phase inverter and the 12AT7 driver grids, allowing full preamp saturation while managing live stage monitoring limits.

Platform & Marketplace Integration

• Live Performance Edge: Pure silicon rectification combined with the un-sagging 1A plate engine ensures that when real-world venue voltage grids sag during live sets, the B+ rail stays rigid. The amplifier preserves a razor-sharp transient note attack while pushing dense, squared even-order musical harmonics straight through the room.