DYNACO Mark-VI

Commentary

This is a bulb-type monaural power amplifier that employs a basic and superior circuit that has been simplified as much as possible.

The Mark-VI has been released as a finished product and a kit.

The circuit employs a parallel push-pull circuit using highly reliable tube 8417 with uniform characteristics.
The signal amplified in the pentode section of the composite vacuum tube 7199 is directly connected to the triode section and inverted in phase to provide an accurately balanced drive voltage to the output tube 8417.

The output transformer employs a multi-layer balanced divided sandwich winding in a super-large core, resulting in an output transformer with high balance, small distribution capacity between windings, and excellent characteristics.
The transformer and tube are connected by an ultra-linear connection. An intermediate tap is provided in the primary winding of the transformer and the screen grid of the tube is connected to the tap. The transformer achieves both the output of a pentode and the low distortion characteristics of a triode.

Equipped with a power meter that can monitor power and bias values.
The sensitivity can be changed to 0, - 6, -6dB and -12dB.

In addition to two sets of flat and low-cut (70 Hz, -6dB/oct) input terminals, it is also compatible with a canon plug.

The buyer received an owner plate with his name engraved on it.

Model Rating

Type	Tube type monaural power amplifier
Effective power	120W
Harmonic distortion factor	1% or less (at 120W output)
Cross modulation distortion factor	1% or less (at 120W output)
Output bandwidth	20 Hz ~ 15 kHz -1dB at 120W output
Frequency characteristic	10 Hz ~ 40 kHz + 0 -1dB at 1W Output
Input sensitivity	1.6 V (at 120W output)
Input impedance	50k Ω
Signal-to-noise ratio	95 dB or more
Damping factor	14(1kHz)
Attachment mechanism	Output meter (3-step sensitivity switching) Input level control Bias adjustment
External dimensions	Width 483x Height 222x Depth 267 mm
Weight	25kg