- Country
- Great Britain (UK)
- Manufacturer / Brand
- Pye Ltd., Radio Works; Cambridge
- Year
- 1954
- Category
- Audio Amplifier or -mixer
- Radiomuseum.org ID
- 145723
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 5
- Main principle
- Audio-Amplification
- Wave bands
- - without
- Power type and voltage
- Alternating Current supply (AC) / 100-150 / 200-250 Volt
- Loudspeaker
- - This model requires external speaker(s).
- Power out
- 12 W (unknown quality)
- from Radiomuseum.org
- Model: PF91 - Pye Ltd., Radio Works;
- Notes
-
Matching pre-amp is PF91A.
Designed for high-quality reproduction from gramophone records and radio. It incorporates 4 alternative equalizer circuits, to compensate for most recording and pickup characteristics in addition to continuously variable bass and treble tone controls and a steep-cut filter for 4, 7 and 12 kHz.
Power output for less than 0.1% distortion at 1 kHz is stated to be 12 W, and hum and noise level -90 dB relative to 15 W.
An interesting design feature is the provision of adjustable positive feedback (in addition to the main negative feedback) in order that the effective output impedance may be reduced to zero to improve loudspeaker damping.
- Price in first year of sale
- 29.40 GBP
- Source of data
- -- Schematic
- Circuit diagram reference
- Radio and TV Servicing books (R&TVS) book
- Mentioned in
- Wireless World (The), London (WW, 79) (Vol. 60, July 1954, p. 353.)
- Author
- Model page created by Keith Staines. See "Data change" for further contributors.
- Other Models
-
Here you find 620 models, 476 with images and 342 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Pye Ltd., Radio Works; Cambridge
Collections
The model is part of the collections of the following members.