All valve distortion?

Haze 40watt and 15 watt

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HAZE MHZ 15 HEAD- 15W, guitar head-unit, five-tube chassis, preamp: 3 X ECC83, power: 2 X 6V6, solid-state rectifier, two channels, reverb, echo, vibe, chorus, front gold control panel, single input, nine knobs (effects adjust, effects depth, r, b, m, t, OD v, OD g, Clean v), power switch, effects switch, channel switch, bright switch, rear panel: emulated line out, two speaker jacks (16 ohm, 8 ohm), effects loop with on/off switch, footswitch jack, two-button footswitch included, black covering, gray grille with white piping and white script Marshall logo, 20.5 lbs., mfg. 2009-2012.

HAZE MHZ 40C COMBO - 40W, 1-12 in. Celestion G12T-66 speaker, guitar combo, five-tube chassis, preamp: 3 X ECC83, power: 2 X EL34, solid-state rectifier, two channels, reverb, echo, vibe, chorus, front gold control panel, single input, 10 knobs (Normal Ch. v, OD Ch. v, OD Ch. g, t, m, b, p, r, effect depth, effects adjust), bright switch, boost switch (Normal Ch.), channel switch, boost switch (OD Ch.), effects switch, standby switch, power switch, rear panel: emulated line out, two speaker jacks (16 ohm, 8 ohm), effects loop with on/off switch, footswitch jack, two-button footswitch included, black covering, gray grille with white piping and white script Marshall logo, 44.7 lbs., mfg. 2009-2012.

HAZE MHZ112 SPEAKER CABINET - 1-12 in. Celestion G12-66 Marquee speaker, closed back, straight or angled front, designed for use with the Haze MHZ 15 Head, black covering, dark gray grille cloth with white piping and white script Marshall logo, mfg. 2009-2012.

Mats A
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All valve distortion?

Postby Mats A » 19 Jun 2011, 02:23

Wonder since the Haze amps only has three preamp valves is it only valve distortion or is it some little diode lurking around there? Is the master pre or post phase inverter valve?

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Re: All valve distortion?

Postby MKB » 21 Jun 2011, 12:37

There are no diodes in the signal path. The master volume is pre phase inverter. Actually the circuit topology of its preamp is somewhat similar to a JCM800 Master Volume amp. The Haze gets its gain through changing the cathode resistor on V2A and adding a bypass cap; the stock 2204 type V2A resistor (10K) actually cuts a lot of gain from the circuit. On a 2204, lower that resistor to around 1.5k and place a bypass cap on it, and you'd be surprised at the amount of gain boost you would get.

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