Accuphase T-11 (1990)

FM stereo tuner with quartz synthesizer tuning and balanced outputs, released in April 1990.

Overview

The Accuphase T-11 is a synthesizer FM stereo tuner made by Accuphase and released in April 1990. It has quartz synthesizer tuning and a pulse tuning manual tuner with a rotary knob. It also holds 16 stations in memory. The design matches the P-11 power amplifier, the C-11 preamp and the DP-11 CD player, so the four make a matched set. The remote commander (RC-5) uses an infrared pulse system. The tuner runs on AC100V/117V/220V/240V and draws 15W.

Specifications

Receiving frequency	76.1 MHz to 89.9 MHz
Tuning system	Quartz synthesizer method
Output impedance	Balanced (XLR): 200 Ω; Unbalanced fixed: 200 Ω; Controlled variable: 1.25 kΩ max
Power consumption	15W
External dimensions	Width 445 × Height 95 (incl. legs) × Depth 325 mm
Weight	9.3 kg
Original price	¥120,000
Current market price	€600

Design

The T-11 tunes with a crystal oscillator. Both the input and amplifier stages are double-tuned. The mixer is a balloon FET balanced modulator with a differential-transformer, and a PIN diode attenuator sits in front. The detector pairs an original DGL detector with a group-delay flat IF filter. It uses nineteen high-speed logic ICs in series, giving a 114-degree phase delay. Two IF filters, Normal and Narrow, are provided. Stereo demodulation uses a PLL circuit locked to the pilot signal, stabilized by a ceramic resonator and voltage-controlled variable reactance. This is the first balanced output circuit in an Accuphase tuner. The front panel adds a signal level and multipath meter, noise filter, muting switch, mono switch and output level control.

Context

The T-11 belongs to the same design family as the P-11, C-11 and DP-11. It is listed as a related product to the T-101. Earlier reference tuners from Accuphase include the T-100 and T-101 from the 1970s and the T-106 from the 1980s.