Grunow 1191 Vintage Tube Amplifier | Push-Pull Hi-Fi Audio - Free Shipping

Grunow 1191 Vintage Tube Amplifier with 12" Speaker

🎶 Vintage Power Meets Audiophile Soul

Grunow 1191 High-Fidelity Push-Pull Tube Amplifier with Turntable Integration

🌀 Classic High-Fidelity Design with Rich Tube Warmth

Rediscover the golden era of sound with the Grunow 1191 vintage audio amplifier—a stunning example of 1930s audio engineering. Featuring a push-pull 6F6 tube configuration, this amplifier delivers rich, full-bodied audio that defined the early high-fidelity movement. Designed with Class AB amplification, it ensures crisp clarity at every volume level, whether you're spinning soft jazz or powerful orchestral arrangements.

With 11 tubes, a full superhetrodyne tuner, and an electrodynamic 12" speaker, this unit was—and still is—a powerhouse. Enjoy broadcast and shortwave reception in exceptional clarity, brought to life with glowing vacuum tubes and a deep bass response modern equipment rarely replicates.

📻 Expert Craftsmanship with Authentic Components

Built for performance and elegance, the Grunow 1191 features a super-chassis design housed in a beautifully preserved cabinet. At its core, the amp uses vintage-correct components including:

• 6F6 output tubes in push-pull, providing 10–14 watts of smooth RMS power

• A likely cathodyne phase inverter and 6C5 driver stage to ensure signal integrity

• Integrated tone control circuitry—Grunow’s early take on custom EQ shaping

• A powerful 12-inch field coil speaker delivering full-range sound across ~80 Hz to 8 kHz

Whether you're an audio historian, collector, or someone restoring a listening room to period perfection, this set captures the essence of early high-performance audio design.

📦 Rare Collector’s Piece with Local Pickup Convenience

This unit is a functional conversation starter, perfect for showrooms, vintage listening rooms, or as the centerpiece of a historical media setup. The full-face bandspread dial, beacon-eye tuning, and clock-style interface bring visual authenticity to match the sonic warmth.

• Measures: 41" H x 28" W x 14" D

• Weight: 55 lbs

• Secure hold available after payment while shipping is arranged

🎚️ Grunow 1191 – Audio Amplifier Overview

Configuration

• Push-Pull Output Stage – This design uses two output tubes working in opposite phases to reduce distortion and increase power.

• Class AB Amplification – Most likely employed for better efficiency and cleaner audio at both low and high volumes.

• High-Fidelity Emphasis – Marketed for its “high fidelity” audio reproduction, which was a premium feature in 1936–37.

📻 Technical Components

Output Tubes

• Two 6F6 tubes in a push-pull configuration.

  • These pentode tubes were standard for quality audio output during the mid-1930s.

  • Push-pull helps cancel even-order harmonic distortion and provides higher output power (around 10–14 watts).

Phase Inverter

• Likely used a cathodyne (split-load) or transformer phase inverter to feed the push-pull stage.

Driver Stage

• Typically a single triode, possibly a 6C5, used to amplify and drive the phase inverter.

Preamp and Tone Control

• Preamp tube (likely 6C5 or 6J5) handled the initial audio signal amplification from the detector.

• Grunow included “fidelity control”, which suggests variable tone shaping circuitry, possibly with treble cut or bass boost.

Speaker

• 12-inch electrodynamic speaker with field coil.

  • Electrodynamic speakers used a powered electromagnet instead of a permanent magnet.

  • Provided strong bass response and improved clarity compared to smaller speakers.

🔊 Performance Highlights

• Power Output: ~10–14 watts RMS – very respectable for 1936–37.

• Frequency Range: Wide for its era (~80 Hz to 8 kHz or more), contributing to the “high-fidelity” marketing.

• Tone Control: Likely rotary or switch-based tone shaping for different listening preferences.

🔧 Summary

The Grunow 1191’s audio amplifier was a well-designed, push-pull tube setup that delivered powerful and relatively distortion-free sound

• 3.5 mm input jack  - For Electric guitar, Bluetooth Input
• Blue tooth enabled device included
• Eleven Tube
• Three Band
• Superhetrodyne Receiver
• Full face band spread dial
• Beacon Eye Tuning Indicator
• 9 AM circuit(s)
• Broadcast plus 2 Short Wave bands.
• Clock-type dial
• 12-inch dynamic speake
• push-pull high fidelity audio system
• Super-chassis design

Measures: 41"h x 28"w x 14''d

Weight: 55 pounds

PLEASE NOTE: This set is located in Sugar Grove, Illinois and can be picked up there.
Payment must be received BEFORE pickup or delivery is scheduled.


Pick-up only on this radio. I can, however, hold it for you while you obtain shipping via either a courier, antique movers, or UShip, which seems to be the lowest cost.