| Nordmende 582 | |||||||||
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Less is more? Look at this: One tube for both channels and enough for a full power amp. As the similar 4-675 this amp uses just one ELL80. This way input sensitivity is not too high, but the amp will work with most preamps. No input tubes means: NO COUPLING CAP! The output power is 1 watt (undistorted) into 4 or 8 Ohms. The maximum output is 2 watts, but with noticeable distortion. The sound? Niiiiiiiiiiiiiiice. Really. Better than any Telefunken S80/81/82. Less is more. Yes. At least sometimes...
What you should do for HiFi use: 1. Remove the capacitor from the plates to B+ (see picture) for correct high frequency response. 2. Add speaker connectors to the output taps of the output transformer (black-yellow and black-red) 3. If you need more bass add a 10uF from the feedback cable (blue) to ground. |
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Original radio console |
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original frequency response |
frequency response whithout cap | ||||||||
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Original radio console (back) |
Original radio console (inside) | ||||||||
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| Modified amp with 6SL7 and EZ80 | |||||||||
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additional driver and rectifier tube |
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| frequency response of modified amp | |||||||||
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