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Post by (8^D) on Jul 8, 2008 20:28:24 GMT -7
Did a retube/rebias on the 6545 today.
Yummy tone!
Put in the GT SAG MHG kit (Special Applications Group 'Marshall High Gain). Included a new set of GT EL34LS #5 biased at 36mA and a Mazda EF86. The EL34LS is a 30 watt tube - this amp is ridiculously loud!!
Awesome!!
The KT side is amazing w/the higher bias and the change to the Mazda EF. Has a nice sizzle to it and just a killer crunch with the volume anywhere over 1:00.
The SRZ side - sounds like a cross between a Plexi and a Hot-rod JCM800. Killer!!
Still too darn loud, but it sounds awesome!! ;D
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Post by drew on Jul 11, 2008 8:52:24 GMT -7
Did a retube/rebias on the 6545 today. Yummy tone! Put in the GT SAG MHG kit ( Special Applications Group ' Marshall High Gain). Included a new set of GT EL34LS #5 biased at 36mA and a Mazda EF86. The EL34LS is a 30 watt tube - this amp is ridiculously loud!! Awesome!! The KT side is amazing w/the higher bias and the change to the Mazda EF. Has a nice sizzle to it and just a killer crunch with the volume anywhere over 1:00. The SRZ side - sounds like a cross between a Plexi and a Hot-rod JCM800. Killer!! Still too darn loud, but it sounds awesome!! ;D Nice Dan. I've not heard of the mazda ef86, are they current production or NOS? I'm liking all this 6545 activity. If you get a chance to post any clips that would be sweet. I've recently started playing with a band that's loud, at least by my last few years standards so I broke out the 6545. The KT45 side rules when cranked. I'm thinking that a less powerful rectifier and the SAG kit would be nice for my quieter situations. Even though I'm playing louder than I've played in years the 6545 is still one loud mofo!
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Post by (8^D) on Jul 11, 2008 13:02:09 GMT -7
Did a retube/rebias on the 6545 today. Yummy tone! Put in the GT SAG MHG kit ( Special Applications Group ' Marshall High Gain). Included a new set of GT EL34LS #5 biased at 36mA and a Mazda EF86. The EL34LS is a 30 watt tube - this amp is ridiculously loud!! Awesome!! The KT side is amazing w/the higher bias and the change to the Mazda EF. Has a nice sizzle to it and just a killer crunch with the volume anywhere over 1:00. The SRZ side - sounds like a cross between a Plexi and a Hot-rod JCM800. Killer!! Still too darn loud, but it sounds awesome!! ;D Nice Dan. I've not heard of the mazda ef86, are they current production or NOS? I'm liking all this 6545 activity. If you get a chance to post any clips that would be sweet. I've recently started playing with a band that's loud, at least by my last few years standards so I broke out the 6545. The KT45 side rules when cranked. I'm thinking that a less powerful rectifier and the SAG kit would be nice for my quieter situations. Even though I'm playing louder than I've played in years the 6545 is still one loud mofo! I'm not sure about the Mazda...it arrived with some amps either in one or as an accompanying tube. The change in the power tube bias made more of an impact though. Changed the EF after the fact to one that fit the new setup a bit better. I bought the 6545 for touring - planned to make it my main amp but it's just SOOoo loud. Once you find the sweet spot, you (and the amp) aren't nearly as happy with settings anywhere else. I actually much prefer the 45 side to the 65. Original plan was 45 clean, 65 crunch. But, now it's 45 rhythm crunch and 65 side lead gain. ;D 2 dirt channels - but the 45 will clean up with a quick roll of the guitar volume knob. It just has such a GREAT sizzle tone - feel, character, tone. Of course, it's LOUD!! too. Earlier this year I bought a Splawn EL34 based head for rock tones because, surprise surprise, it was MUCH quieter in the sweet spot. Has a Triode/Pentode 1/2 power switch to go from 50 to 25 watts. Perfect for gigging. There are 3 things I don't like about the 6545. 1. Too loud. I have attenuators. I'll use the occassionally - but this would be an all-the-time situation with this amp 2. No effects loop. With the volume and gain levels, delays are useless before this amp - almost a 1 to 1 presence in the mix (repeat note at the lowest possible setting is almost the same level as the initial note...and that's consistent with every delay I've tried). It REALLY needs an effects loop for any time-based effects to set in the mix. 3. Bass gets really farty/woofy really fast. Needs a cap value change - through different tubes, different biasing, different guitars, different cabs, it's always 0-90 between 7-8:30 with the additional 10% coming before 2:00. But, I keep it here because, in spite of the above, it's just a KILLER sounding amp! ;D I use inefficient speakers and point the cabs backwards, add delay via front-of-house, and keep the bass control between 8-8:30.
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Post by Paul (TRANE) on Jul 16, 2008 10:49:41 GMT -7
Has to be the loudest amp I have ever used. Love the tone though. Got Brimars in the 12AX7 slots and a GEC EF86. Truly a killer sounding amp....jsut too loud for a lot of rooms.
Paul G.
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Post by myles on Jul 16, 2008 16:34:05 GMT -7
Mr. Mom ...
I use the SAG MHG kits in Carl Verheyen's SRZ-65s.
Just a question if you still have the boxes from V1 and V2 ... what numbers were on the boxes?
Once I leave GT in mid August it will be interesting to see what GT does about the MGH kits as I am the guy that makes up every one of them.
There are a number of parameters that go into their selection ... transconductance, DC plate current, plate resistance and true gain. I used to make these kits for my GAB clients long before I came to GT in May of 2002 and GT turned the MHG kit into a product. But ... once I am gone I do not know how they are going to continue to do these as I am the one that came up with the formula and procedure pre-GT ... and I really am not going to tell anybody else how to do this unless I am compensated in some way as it was my deal long before GT. There also needs to be a relationship between the V1 and V2 tubes or else one negates the benefit of the other like two speakers out of phase in the same cabinet.
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Post by drew on Jul 24, 2008 9:42:41 GMT -7
Hey Dan, You're probably already tried this but diming all of the 65 side tone controls has this interactive thing happening that seems to tame the huge bass response you'd mentioned. I do roll the treble back just a bit when diming all of the tone controls. I'm not one to dime tone controls but read a post by the doc a while back about maz controls. I thought it would be too much but that's how I ran my Maz Sr all the time. YMMV. I agree with you about the 45 side, that's great tone and so tweakable.
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