Dynaco - Quadaptor , Graphic Equaliser & Preamplifier Rare Items Audio component - Multiple models

Classic Dynaco HiFi Trio — Vintage, Versatile & Ready to Shine

Elevate your listening experience with a rare, all-Dynaco signal chain: the PAT-5 Bi-FET preamp, SE-10 graphic equalizer, and Quadaptor matrix unit. This matched set delivers dynamic performance, tonal control, and immersive spatial capability—capturing the spirit of 1970s design with robust functionality that still holds up today.

Dynaco PAT-5 Bi-FET Preamplifier

Era / Age: Introduced in the mid-1970s as an improved successor to the PAT-5, the Bi-FET version adopted FET input stages (notably the LF357 op amp) for lower noise and improved dynamic behavior.

Highlights:
 • Full-feature preamp with support for two phono inputs, multiple high-level sources, tape monitoring loops, and a speaker‐selector (for A/B) built in.
 • Always-on internal circuits (the front power switch controls convenience outlets only) to avoid turn-on transients.

Key Specifications (Bi-FET version)
 • Frequency response (high-level inputs): ±1 dB from 10 Hz to 50 kHz
 • Distortion (2 V → 10 kΩ + 1 000 pF): ≤ 0.007 % (20 Hz–20 kHz)
 • Phono gain (MM low): 57 dB; (MM high): 63 dB
 • High-level gain: 20 dB (line-in to audio-out)
 • Hum & noise: ~70 dB down for phono, ~90 dB down for line inputs
 • Output: ≥ 7 V into 10 kΩ; 4.5 V into 1 kΩ
 • Input impedances: Phono 47 kΩ ∥ 220 pF; Line 50 kΩ
 • Output impedance (audio out): < 600 Ω
 • Channel separation: ≥ 70 dB (20 Hz, 2 kHz)
 • Power consumption: ~12 W (AC mains), supporting 120 V or 240 V operation
 • Physical size: ~13.5 × 14.25 × 11.75 in (≈ 34.3 × 36.2 × 29.8 cm)


This unit is a rare example of Dynaco’s ultimate solid-state preamp, combining vintage character with serious technical pedigree.


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Dynaco SE-10 10-Band Graphic Equalizer

Era / Age: Released in 1976 under design by Wade Burns, the SE-10 was Dynaco’s flagship equalizer.

Design Highlights:
 • Uses a hybrid approach: L–C resonators for the higher bands and gyrator circuits (via op-amps) for the lowest four frequencies (30, 60, 120, 240 Hz) to avoid bulky inductors.

Specifications
 • Frequency bands: 30, 60, 120, 240, 480, 960, 1.9 k, 3.8 k, 7.7 k, 15 k Hz
 • Boost/cut range: ±12 dB
 • Output level: 2 V nominal (up to 8 V max)
 • Frequency response: 10 Hz to 35 kHz
 • Signal-to-noise ratio: 85 dB
 • Total harmonic distortion: 0.04 %
 • Input impedance: ~50 kΩ
 • Output impedance: ~600 Ω
 • Dimensions: ~343 × 108 × 267 mm; weight ~4.3 kg


With the SE-10 in your signal path, you can tailor tonal balance, flatten room response, or restore lost texture in older recordings—all with vintage analog charm.


Dynaco Quadaptor (QD-1)

Era / Age: Likely from around 1970, contemporaneous with Dynaco’s Dynaquad system era.

Function: A passive (no-power) matrix adaptor that converts a 2-channel stereo signal into 4 channels (“4-dimensional” or "quadraphonic") per the Dynaquad encoding principles.

Details / Features:
 • No external power required
 • Rear level/gain control and balance check switch for fine adjusting the rear channels balance relative to the front ones
 • Uses screw-terminal connections for ease of wiring


The Quadaptor is a vintage gem for anyone wanting immersive spatial effects with vintage systems or recreating authentic 1970s quadraphonic sound.


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Combined Appeal & Use Case

This trio forms a complete, high-flexibility front-end:

1. PAT-5 Bi-FET handles source switching, phono, tone bypassing, volume control, and high-fidelity buffering.


2. SE-10 allows detailed tonal shaping (±12 dB per band) for acoustic correction or creative equalization.


3. Quadaptor opens the door to quadraphonic reproduction—enriching stereo with ambient rear signals.



Whether your goal is vintage stereo refinement or a retro quad experience, this set offers mature, tasteful analog signal control. The components complement one another beautifully both in circuit and aesthetic style, offering not only sonic utility but also collectible value for the vintage audio enthusiast.

Please see detailed photographs for the items physical condition as they form part of the description part of the sale.
All units are sold as working please understand that vintage electronic items are not guaranteed.

Please note that we will pack them with our custom double box and bubble wrap system and we pack for the safety of the items not for economy.