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Unread 07-25-2011, 10:13 PM   #1 (permalink)
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Haze 40 tube upgrade

For those who have replaced the stock tubes in the haze 40, which had a greater impact the preamp or the power tubes? I find the stock tubes to be muffled at higher volumes, especially the gain channel. Which tubes do you prefer an why?

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Unread 07-26-2011, 06:28 AM   #2 (permalink)
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Re: Haze 40 tube upgrade

Both. The stock tubes in my Haze were awful! High gain Shuguang tubes in all 3 preamp slots and then some unbiasable Svetlana EL34's that'd randomly red plate. I replaced them with new production tubes, it's just a Haze, it can wait on vintage glass. I used:

V1 & V3: Tung-Sol 12AX7
V2: JJ Long Plate 12AX7
Power: Groove-Tube EL34-M's (make sure it's the -M's if you go that route, the other EL34's GT sells don't sound so good)

I think the whole she-bang cost me like $60-$70. Here's a clip in the gain channel, boost on, gain on 8, volume on 6. It's recorded with my cellphone, so pardon the quality a little, but it's certainly not muffled at high volume:

http://www.cowboymafia.net/frankie/haze40.mp3

Also, the Haze is notorious for having a little muff/woof in the boost channel. As soon as I can get this order in with mouser I'm going to mod mine to get rid of that. I'll report back here on the forum with my results.
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Unread 07-26-2011, 06:32 AM   #3 (permalink)
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Re: Haze 40 tube upgrade

Oh yeah, sounds like you're already on the way since you're asking questions about high volume, but break in that Marquee speaker. Mine didn't sound so hot when I first got it, but now that I've played a bunch of gigs with the Haze, that speaker is nice and settled in. IMO the internal speaker sounds even better than sticking it on a 4x12 now.
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Unread 07-26-2011, 11:34 AM   #4 (permalink)
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Re: Haze 40 tube upgrade

They must have changed it up at some point. The pre's in my 2010 Haze 40 were JJ's... I forget what the power tubes were (tossed 'em). On a recommendation, I put JJ EL34L's in and the amp was sweet afterwards... the bottom was tighter too.

I know I'm gonna regret having traded it in my quest for an amp in a head box.
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Unread 07-26-2011, 03:52 PM   #5 (permalink)
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Re: Haze 40 tube upgrade

Quote:
Originally Posted by Frankie View Post
Also, the Haze is notorious for having a little muff/woof in the boost channel. As soon as I can get this order in with mouser I'm going to mod mine to get rid of that. I'll report back here on the forum with my results.
Frankie, what mods are you doing? I'm about to take another stab at modding mine, am wanting even more highs than the C72/C73 mods will give. It sounds just about right with the boost off, but with boost on it's not quite bright enough (i.e. treble harmonics in the overdrive). I'm thinking of a mod that will even this out. Am looking to get into 2204 bright territory.

If I get the time this week I'll try to drop the new mods in and will report here if anyone is interested.
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Unread 07-27-2011, 10:33 AM   #6 (permalink)
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Re: Haze 40 tube upgrade

Those are the mods that I was gonna do. Lemme know if you find something better!
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Unread 07-31-2011, 07:25 PM   #7 (permalink)
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Re: Haze 40 tube upgrade

Quote:
Originally Posted by Frankie View Post
Both. The stock tubes in my Haze were awful! High gain Shuguang tubes in all 3 preamp slots and then some unbiasable Svetlana EL34's that'd randomly red plate. I replaced them with new production tubes, it's just a Haze, it can wait on vintage glass. I used:

V1 & V3: Tung-Sol 12AX7
V2: JJ Long Plate 12AX7
Power: Groove-Tube EL34-M's (make sure it's the -M's if you go that route, the other EL34's GT sells don't sound so good)

I think the whole she-bang cost me like $60-$70. Here's a clip in the gain channel, boost on, gain on 8, volume on 6. It's recorded with my cellphone, so pardon the quality a little, but it's certainly not muffled at high volume:

http://www.cowboymafia.net/frankie/haze40.mp3

Also, the Haze is notorious for having a little muff/woof in the boost channel. As soon as I can get this order in with mouser I'm going to mod mine to get rid of that. I'll report back here on the forum with my results.
Hey Frankie,

I just picked up a Haze 40. I played one and it sold itself. I also need a small combo to take around with some balls. You say your Haze came with EL34's? Mine has the 6V6's in the power tube section. Did you get an earlier model? I am just starting to really get into the amp.
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Amps & Cabs
1984 JCM 800 2204
modified with extra valve stage and channel switching. Effects loop added.
foot switch jack added
1989 JCM 800 2204 modified with effects loop
1960A 4X12
1960B 4X12
Haze 40 Combo

Guitars
2010 Les Paul Traditional Pro Gold Top
1987 Ibanez JEM 777 DY
1981 Ibanez Destroyer
Mid 1970's Vantage
1997 Taylor 410 acoustic
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Unread 07-31-2011, 09:02 PM   #8 (permalink)
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Re: Haze 40 tube upgrade

6V6's? That's not right, only the Haze 15 should come with those. Someone might've put them in there to quiet it up. That amp is supposed to be 2xEL34.
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Unread 07-31-2011, 09:35 PM   #9 (permalink)
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Re: Haze 40 tube upgrade

Thanks for the replies. Is there a video anywhere showing how to bias the haze? My deluxe reverb is a piece of cake to bias--just turn a screw without having to take anything out. What about the haze?

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Unread 07-31-2011, 10:30 PM   #10 (permalink)
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Re: Haze 40 tube upgrade

The Haze has test points in the back if you take the baffle off. It's similar to the DSL, center is ground, then your positive test points are on either side. I think the manual says 39mA (so 39mv on your meter) per tube. If you're biasing 6V6's that'll be a different number.
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Unread 08-01-2011, 01:16 PM   #11 (permalink)
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Re: Haze 40 tube upgrade

Quote:
Originally Posted by Frankie View Post
6V6's? That's not right, only the Haze 15 should come with those. Someone might've put them in there to quiet it up. That amp is supposed to be 2xEL34.
Hey man,

You are correct. I was looking at the spec page for the Haze 15. The Haze 40 spec page lists EL34's
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Amps & Cabs
1984 JCM 800 2204
modified with extra valve stage and channel switching. Effects loop added.
foot switch jack added
1989 JCM 800 2204 modified with effects loop
1960A 4X12
1960B 4X12
Haze 40 Combo

Guitars
2010 Les Paul Traditional Pro Gold Top
1987 Ibanez JEM 777 DY
1981 Ibanez Destroyer
Mid 1970's Vantage
1997 Taylor 410 acoustic
Early 70's Sanchez Brazilian classical guitar
Ibanez Soundgear Bass guitar
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