royal guard

Hi everyone
I got a problem with my Haze 40. The clean sound on normal channel became distorted even on the minimum level. Moreover, on the zero level of sound it is not muted, but gives a distorted sound as well. We do not have official service centers in my country, that's the reason why I'm looking for the electric scheme and asking your advice where I can find the scheme, and who knows about such problem?
thanks!

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MKB

The schematic is available in the second post of the linked thread below, you may have to register to get access to it.

Marshall MHZ40C Haze 40 Schematic Anyone?

You should also be able to contact Marshall directly and they should send it to you.

service@marshallamps.com

Concerning your problem, I haven't heard about such an issue, and nothing comes immediately to mind that could be the problem. I'd probably check the control potentiometers and confirm they are undamaged and are soldered properly to the PCB.

indeedido

I had the Haze 15 stack for a few days before I returned it. The overdrive channel leaked into the clean. Turn the gain down on the overdrive channel and see if that cleans it up. I bet you a dollar it does.

FMTDee

I returned a Haze 40 (ebayer sold me a floor demo as new) recently, and it had multiple issues, including the one described above. It only seemed to happen when the gain was all the way up or near all the way, but it didn't happen when the gain pot was below 3 o'clock. Even when the volume for the Normal channel was turned all the way down, you could hear distorted guitar, quietly. For me, this poses a bit of a problem; yes, I get that you clean up the normal channel by backing off your guitar volume... Still, with not a lot of headroom, I don't want unwanted gain bleeding through. And I might WANT high-gain on the OD channel. (I might not, but I might. I don't want design/component issues interfering with my options.)

Wednesday, I will be receiving what I understand to be a BRAND NEW, relatively fresh off the line Haze 40 from Sweetwater, who assured me that their stock is newly-produced. I will find out once and for all of all these wrinkles have been ironed out. Are the schematics at the link MKB provided for the original, the modified stock, or the new-issues?

indeedido

I'll be curious to hear how your new one sounds. Issues aside they have a nice tone. I agree too you shouldn't have to compromise a channel because of a design flaw.

royal guard

Thanks a lot for the info, got the scheme!

In my case distorted sound on the Normal channel existed even if overdrive channel gain and volume knobs turned down. I checked the color cables in the amp, and had to reconnect one of them (white). It seems it helped to solve the problem, let see for how long.
Thanks everybody!

royal guard

Checked it once more, you're right - overdrive channel leaks into the clean.
Anybody knows if it is possible to repair it without sending to Marshall or dealer?

MKB

This schematic is the original without the channel popping fix. You can make sure yours has the channel popping modification if it has the following values:

R90: 1M

R100: 220K

R101: 1M

FWIW, mine has never had any leakage between channels at any gain level. In fact, from a brief look at the schematic, it's difficult to see how the problem can be leakage between the channels, because there are not separate gain stages in the amp for each channel. This amp uses the same tube sections in each channel, and changes the gain of each stage to change the overall gain level. You normally get leakage when there are two separate channels in the preamp, and the distorting channel is not fully muted when the clean channel is activated.

It might be that some of the preamp tubes are microphonic, this can sound like distortion in some cases.

royal guard

Is there any probabilty that changing all ECC83s will help with the leakage?

Thanks

FMTDee

Well, got the new Haze 40 in today, brand new from Sweetwater, supposedly newly-issued stock. I did NOT notice any channel-switching issues, so that apparently got fixed, nor did I notice any significant buzzing with bass or volume like before, although I am hearing a bit of a chimey sound with certain notes, like before--perhaps a microphonic preamp tube? It's not NEARLY as pronounced as on the ones I returned, and from what I've been reading here it's a minor fix.

I did also notice gain bleeding into the normal channel as before, although once again it's not quite so pronounced as on the other units I had. While I probably won't be using the OD channel all that much (and I REALLY doubt I'll need gain cranked up high enough for it to affect anything), still, I don't like it. It's a flaw.

The biggest problem I had was while playing the normal channel, after playing on it for awhile, it began to get static and cut out. When it cut out, you could only hear whatever gain was bleeding through, and static. It came FedEx, and the box was banged up a bit, so I pulled the back off and made sure the tubes were seated. The metal sleeve over V1 wasn't completely secured, and V3 was a little wobbly. Once I powered back up, I had the problem for a split second and it hasn't come back since, so I'm hoping I fixed the cause of the problem. I only had a few hours to play on it today, some more time on it will help me root out any more problems it has, if any.

I really love this amp. The cleans are better than I ever expected. But I will say that I think the Normal channel cranked sounds way better than the gain on the OD channel. Marshall could've left off the effects and made it a single-channel amp and I still would've bought it. (Not a fan of the digital effects....)

I will probably post these "results" on a few other threads that cover the Haze, so pardon the duplication!

Jonno

hey guys ,
i like this amp and its tones it give for the style that i play, but not the problems that come with it.

this is a copy of my letter that i have sent to Marshall, about my Marshall haze 40w combo amp.


My first question is. was my Marshall haze 40w made on Monday or on a Friday or ( just a lemon ) .

I have got a my Marshall haze 40w a week ago ( from this date 14 Aug 2010 ). and I have smelt something funny coming from the amp
( plastic like smell ). ( I asked dad what the smell might be coming from and in his words ' the transformer or the valves/ tubes are working in, nothing to worry about ' ).

on the second day of having the amp, ive played it for about 10 min because i wanted to try out the (2-way) foot-switch that came with the amp and what a suprise it didn't work .

on the third day i worked the amp for about 45 min and the smell got worse ( not even an open window in my room could help ).

to see where the smell came from i shone my torch into the top vent of the amp, and i could make out that something was hanging on the valves/ tubes.when i had taken a closer look at the problem it was the rubber like vibration strip ( were the chassis of the amp and the top of the wooden box meat ).

in my attempt to save the amp ( valves/ tubes / the 2 el34's ) i have removed most of the rubber like vibration strip from the valves/ tubes , but one of the valves/ tubes still has that stuff on it , and im afraid that the life of my valves/ tubes has been shortened by this problem.

i have heard that Marshall has/is making a fix kit to fix most of the problems with the Marshall haze 40w amp, and i wanted to know how to get one in case i face more problems ( God forbid leaking capacitor ).

overall i love this amp with tones that come from it.

with the help from Marshall I'd like to rectified all of my problems with this amp.


IMG_0475.jpg

IMG_0477.jpg

Wildriff

I have the HAZE 40 and it has worked perfect for the 5 weeks I've had it and I play the hell out of it everyday including rehearsals at full band volume. Not one issue so far. Knock on wood. I love this amp.

Wildriff

Wow Now this is what I call service. Hats off to Marshall and Peter at Ericson Canada.
I had my first issue with the Haze yesterday. I turned it on and the effects didn't work. I shut it down restarted and same thing. Anyways I had to do some stuff and when I came back I turned it on and everything was fine. I figured I better get it checked so I sent an email to Marshall first off asking if their was an issue I should know of. Within hours I had a reply from Peter at Ericson Canada who is the distributor saying Marshall had forwarded the message to him and to take it to the local repair shop and have it checked out. He also told me if there was any issue whatsoever that could not be handled asap to message him back and he would take care of me pronto. Turned out it was something loose from shipping and not a big deal. My point is I owned a Soldano Avenger for a while and at the time thought it would be cool to have the matching cab. I went to the Soldano site and they had no cab and speaker options on the site at all. I emailed Soldano 3 times and no reply at all. The 4th email was to tell them to f-off.
I am very pleased with not only the speed in which Marshall got on this minor problem but also with the way in which Peter took the time to make sure I was a satisfied customer. So hats off to Marshall and Ericson if your ever my way the beers on me.

As a side note the shop gave me a Mesa f-50 to use while they checked out the Haze as I had rehearsal last night. For the life of me I don't know what anyone sees in that amp. What a toneless piece of junk. All top end Buzzsaw on the drive channel and flat lifeless on the clean. How it got rated a 5 star is beyond me.

Micky

Nice!

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Wildriff

I sent Ericson a message seeing as they are so quick to respond and asked them about adding an extension speaker cab. to the Haze40. As is show in the amp specs the Haze40 is an either or as far as speaker connections go. So I asked them what was need to add an input into the chain to allow for an extension cab being used at the same time as the internal speaker. I have a 1 x 12 extension cab that I want to run with the Haze so it was important to me to see if there was a way around this issue. The following was their reply ( and again I might add reply time was less then 3 hours ).

Reply Start:
The haze has already 2 output speaker jacks
The only way would be to use the 8 ohms socket, plug in this socket the internal 16 ohms speaker and a 16 ohms cab.
A tech will be able to do this.

Reply end:

This to me contradicts the specs but makes sense at the same time. Why would I need a tech to change were the internal speaker is plugged in if this is the case. I'm going to investigate this a little further and will post the results for the Haze40 users on the forum.

Moose Lewis

What load is your speaker cab? I may be showing my ignorance here... but wouldn't a Y-adapter used in one of the jacks work?

I've had a new one for 6 weeks now. I run it for at least 5 hours daily (if anything is going to go, I want it to happen now - not later). So far (knock wood), I've not experienced any issues - just joy.

I only run one speaker cab at a time... and have not had the stock speaker hooked up since I tested it at my local music store. I'm using a 1-12 Egnater cab for recording and a 1960a (on loan, actually - need to buy one) for jamz. I traveled for many years playing small to concert size venues using a Vox Buckingham 2-12 tilt-back cab (with a 50w Marshall head) and never needed more (except for show)... so I figure a 4-12 will be all I'll need. The sound is different between the two (obviously); but with a little tweaking I seem to get what I want both ways. The stock speaker in the Haze seems a bit muddy on the bottom end compared to the other two cabs ('chunk')... but I'm not a fan of having a speaker pounding in the same box with an amp anyway.

I want to expand on this thought - but I think I may need to start a new thread to get some feedback and info on where I wish to go with this.
Cheers

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Wildriff

The H&H speaker I have is 16 ohms. I tried them both plugged in just to see what they sounded like together and the combination of the on board Marquis and the H&H sounded fantastic. The cab I have is home made out of 7ply birch. Built like a tank and that old H&H in it sounds great. They really seem to compliment one another.

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Guitars
1959 Les Paul Special
1975 Fender Strat Black
1992 Fender Strat White
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1977 Fender Twin Reverb
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FreakyPain

Here is my experience and letter to Marshall let's see how fast they are with this one. I love Marshall by the way and still do, but I mean the letter say sit all:

I recently purchased a Marshall Haze 15 Head unit from a local Music Store (New). I have always loved the sound of a Marshall tube amp and was not disappointed with the Haze 15....for about an hour and something fritzed and the OD channell stopped working. I took the head back to the store the next day and decided to go with the Haze 40 watt Combo. Again not disappointed the tones from this unit were phenominal......for about three minutes....fresh out of the box and the exact same problem as the Haze 15. OD Channel cooked in 3 minutes everything on the amp at 0 except the volumes both at 2. When I looked at the Marshall forums to see what the issue is I found I'm not the first to have this problem in fact it seems prevolent in this amp. I bought this amp today August 30/2011 and find that the amp I got is actually a 2009 manufacture based on the serial number. It may be new in the sense of not being played but its still a 3 year old amp. And as it turns out is the version of the amp that has all these issues. I know Marshall is a phenominal product but I feel like a jilted lover. For me this was a huge purchase and I saved specifically to buy this very amp, my first tube and it had to be a Marshall. I've loved Marshall all my life, but I don't know if I can trust you!!!! Help