50 Watt Amplifier
Vortexion Ltd.; Wimbledon
- Country
- Great Britain (UK)
- Manufacturer / Brand
- Vortexion Ltd.; Wimbledon
- Year
- 1939
- Category
- Audio Amplifier or -mixer
- Radiomuseum.org ID
- 340161
- Number of Tubes
- 7
- Valves / Tubes
- 6F5 6F6 6N7 6L6 6L6 unknown_regulator unknown_regulator
- Main principle
- Audio-Amplification
- Wave bands
- - without
- Power type and voltage
- Alternating Current supply (AC)
- Loudspeaker
- - This model requires external speaker(s).
- Material
- Metal case
- from Radiomuseum.org
- Model: 50 Watt Amplifier - Vortexion Ltd.; Wimbledon
- Shape
- Miscellaneous shapes - described under notes.
- Notes
-
Vortexion 50 Watt Amplifier
The company was under the direction of the UK government during WW2 to produce amplifiers for Air Raid Precaution and the company claimed many hundreds of this 50W amplifier chassis were in use.
A pair of matched 6L6s with 10% negative feedback is fitted in the output stage, and the separate HT supplies to the anode and screen have better than 4% regulation, while a separate regulator provides bias.
The 6L6s are driven by a 6F6 triode connected through a driver transformer incorporating feedback. This is preceded by a 6N7, electronic mixing for pick-up and microphone.
The additional 6F5 operating as the first stage on microphone only is suitable for any microphone.
Tone control is fitted, and the large eight-section output transformer is available in three types;- 2, 8, 15 & 30 Ω
- 4, 15, 30 & 60 Ω
- 15, 60, 125 & 250 Ω
These output lines can be matched using all sections of windings and will deliver the full response (40-18,000 c/s) to the loudspeakers with extremely low overall harmonic distortion.
Chassis with valves and plugs £17/10/-
Or complete in black leatherette cabinet with Collaro turntable, Piezo P.U. and shielded Mike transformer for £22/10/-.
Wireless World Jan 1941 Page 27Ed: I think the 6F6(Pentode) & 6N7(Duo Triode) are swapped in the description in the above text.
- Price in first year of sale
- 22.50 GB £
- Mentioned in
- Wireless World (The), London (WW, 79) (Jan 1941 Page 27)
- Author
- Model page created by Gary Cowans. See "Data change" for further contributors.
- Other Models
-
Here you find 22 models, 18 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Vortexion Ltd.; Wimbledon