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Fully tested and Cleaned
DescriptionThe Mark IV Amplifier uses a circuit arrangement based on that of the Dynakits Mark II and Mark III which have become world famous for superior quality while essentially simple and trouble free.
The new 7199 tube is used as a pentode high gain voltage amplifier directly coupled to a cathodyne phase inverter. All parameters are adjusted for minimum distortion.
This type of phase inverter has the unique advantage that its operation is independent of tube ageing so that no adjustments are required in maintaining optimum performance.
An internal capacitive feedback loop balances the phase inverter at the highest frequencies, and the arrangement provides accurately balanced driving signals to the output tubes, which are EL-34's operated well below their maximum ratings.
The output tubes use a fixed bias arrangement which is set through use of Dyna Biaset (patent pending) which provides optimum linearity of the tubes and minimizes the effects of unbalanced components.
The connection of the output tubes includes a small percentage of screen loading which improves the regulation of the output stage and makes it comparatively uncritical of load impedance.
SpecificationsPower output: 40 watts into 8Ω (mono)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 1%
Damping factor: 15
Input sensitivity: 1.3V
Signal to noise ratio: 90dB
Speaker load impedance: 4Ω to 16Ω
Valve complement: 2 x EL-34, 1 x 7199, 1 x GZ-34, 1 x selenium rectifier
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| Listed | 2 years ago |
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