Ravensbrook Stereo Amplifier
Rogers, Catford (see also Rogers Birmingham)
- Country
- Great Britain (UK)
- Manufacturer / Brand
- Rogers, Catford (see also Rogers Birmingham)
- Year
- 1969
- Category
- Audio Amplifier or -mixer
- Radiomuseum.org ID
- 287316
- Number of Transistors
- 19
- Semiconductors
- BC253 BC171 BC171 BC171 BC171 BC171 unknown_tr_PNP SDT9201 SDT9201 unknown_tr_PNP
- Main principle
- Audio-Amplification
- Wave bands
- - without
- Power type and voltage
- Alternating Current supply (AC) / 110; 125; 220; 240 Volt
- Loudspeaker
- - This model requires external speaker(s).
- Power out
- 30 W (undistorted)
- Material
- Wooden case
- from Radiomuseum.org
- Model: Ravensbrook Stereo Amplifier - Rogers, Catford see also
- Shape
- Tablemodel, low profile (big size).
- Dimensions (WHD)
- 365 x 127 x 250 mm / 14.4 x 5 x 9.8 inch
- Notes
-
Following the success of the Ravensbourne stereo amplifier, the manufacturers now announce a new model, called the Ravensbrook, with a more modest output of a nominal 10 watts per channel. It is claimed that a number of original ideas have been developed to improve performance and reduce cost at the same time. The single printed circuit board is made of fibreglass, and this method is thought to be exclusive to Roger’s amplifiers.
The four-way push-button Input selector provides for selection of Disc, Tuner, and Tape Inputs; the fourth button gives Mono/ Stereo operation. When reproducing Mono the left-hand input channel is connected to both speakers and the output from a compatible stereo pickup is connected in parallel for playing mono records. The provision of a Tape panel socket (duplicated at the rear) to the DIN Record/Playback standard together with full monitoring via a three-head machine make this model particularly interesting to recording enthusiasts. On the disc side a dual sensitivity switch for virtually all high-quality pick-ups, from ceramic to the new very low output magnetic types.
Power output is quoted as 10 watts RMS into 15 ohms (15 watts RMS into 8 ohms) and total harmonic distortion as less than 0.1% 1kHz at 10 watts into 15 ohms and less than 0.25% at 10 watts into 15 ohms over the range 100 Hz to 10 kHz.
Output impedance matching is 8 to 16 ohms.Special features of the circuitry include a low-noise pick-up input stage using a special low-noise PNP transistor in conjunction with a high-output second stage to achieve a wide dynamic range and avoid distortion on peak recorded passages. Quadrifilar transformers are used to drive two pairs of high current gain transformers giving very low distortion. All four windings on the transformers are wound simultaneously, a technique which is said to result in maximum coupling and perfectly balanced windings.
Dimensions arc 14⅛ x 9 ⅞ x 5 inches including knobs and feet, and prices are £42 10s. for the chassis model, £47 10s. for the cased model, and the teak case alone if required £5 plus 10s. 1d. purchase tax.
Sockets :
- Disc Input 3 pin DIN
- Tuner Input 3 pin DIN
- Tape (on back) 5 pin DIN
- Tape (on front) 5 pin DIN
- Speaker outputs 2 pin DIN x2
This amplifier was superseded by the Ravensbrook Series 2 model with a headphone socket.
The transistors listed are one channel only plus the voltage regulator (2N3611).
- Net weight (2.2 lb = 1 kg)
- 11.75 lb (11 lb 12 oz) / 5.335 kg
- Mentioned in
- -- Original prospect or advert (Tape Recording UK, Mar 1969, Page 100.)
- Literature/Schematics (1)
- - - Manufacturers Literature
- Author
- Model page created by Howard Craven. See "Data change" for further contributors.
- Other Models
-
Here you find 39 models, 39 with images and 6 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Rogers, Catford (see also Rogers Birmingham)
Collections
The model Ravensbrook Stereo Amplifier is part of the collections of the following members.