Biasing Haze 15

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.

shaun
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Biasing Haze 15

Postby shaun » 09 Aug 2014, 04:42

The haze 15 runs a pair of 6V6 power amp valves.
I checked the voltage at 385 V, and the bias read approx. 28-29 per valve (at 70% approx).
I used a multimeter to check the voltage off pin 3, and an octal bias plug into a multimeter, to check the bias reading.

My question is, it appears to have 2 bias pots, so can a miss matched set of 6V6 valves go in, and each valve baised individually, or does it still need a matched pair of replacement valves?

:boobs
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Re: Biasing Haze 15

Postby shaun » 09 Aug 2014, 17:30

I did a bit of searching, and to answer my own question, yes the power amp valves can be mismatched and biased individually.

To Steve D for that info.
"Anyway, I see this forum isn't too happening, but hopefully I'll get some responses." Sully

"I find the above statement offensive. Funny, but offensive. No offense intended by my comments." Shaun

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