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Post by foxx on Jun 11, 2006 13:41:10 GMT -7
Hey Myles on the Mazerati, which el84's are pairs? Outsides, left set and right set? I might get another matched quads at a rating of 4-5 and mix and match with the 7's I have now. Thanks
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Post by billyguitar on Jun 11, 2006 13:50:39 GMT -7
If you do the tube pull thing I believe you should go to the next higher impedance tap. Myles will know for sure.
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Post by foxx on Jun 11, 2006 14:17:22 GMT -7
Billy, we might be talking about two different things. I meant I would swap 2 el84's @rating of 7 for a set rated at 4-5. I guess I mean the GT rating.
It seems that you are refering to just removing 2 el84's. If so, what does that do?
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Post by billyguitar on Jun 11, 2006 14:34:22 GMT -7
You're right! My itty bitty brain was thinking about something else. I was thinking Myles said it was okay to pull two output tubes for lower volume but DON'T DO IT. I've read you're not supposed to do that on Zs. My bad! Please disregard my previous post. I'd delete it but then your post would look odd. Don't pull any tubes!
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Post by foxx on Jun 11, 2006 15:24:06 GMT -7
I just pulled the tubes and the house is now on fire, OMG!!!!!!!!!!!
Just kidding.
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Post by myles on Jun 12, 2006 8:55:06 GMT -7
Hey Myles on the Mazerati, which el84's are pairs? Outsides, left set and right set? I might get another matched quads at a rating of 4-5 and mix and match with the 7's I have now. Thanks The pairs are the two left as one pair and the two right as a pair rather than the more common class A/B inner tubes as a pair and the outer tubes being the second pair. |
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Post by myles on Jun 12, 2006 8:56:56 GMT -7
If you do the tube pull thing I believe you should go to the next higher impedance tap. Myles will know for sure. DO NOT pull tubes on cathode biased amps. On grid biased amps, if you pull a pair then you go DOWN not up. Example .... all normal with a ohm cab .... speaker in 8 ohm tap. Pull a duet of a quad and set to the 4 ohm tap. I do not like doing this on any amp as a side note. |
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Post by foxx on Jun 12, 2006 9:52:51 GMT -7
Thanks Myles. +1
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Post by propellr on Jun 12, 2006 12:11:54 GMT -7
Myles, I experienced a problem with my wife's new bass rig today. Here's a short description of the rig: Jazz Bass-->Strobostomp-->A.R.T. Tube M.P.-->Phil Jones Bass Six Pack Amplifier. The J-Bass is a 2003 model, the Strobostomp is brand new, the Tube M.P. I bought 2 years ago and never used until the other night, the Amp is brand new, and so are the cables (2 12' Monster Bass cables and 1 3' Monster ProLink cable) OK, here's what happened: The sound cut out altogether while I was playing. The lights on the amp were still on, and the yellow and red leds were coming on fine as I continued to play. The fan was still working on the amp, the green led on the Tube M.P. was also still on. I turned all the volumes down (bass, M.P., amp), unplugged everything, plugged the bass straight into the amp, and turned it back on. Volumes up, and everything fine. Turned off again, replugged everything in again, also everything fine, then cut out again, same song, second verse. This happened a third time. Each time, I waited several seconds after I turned off everything, before I turned on again. Also, there was a "click" when the sound cut out each time. I had the pickups fully on, the send and receive on the Tube M. P. set at about 10:00 each (with the 25 dbl. gain boost selected and the phase reverse also selected). The amp's preamp was fully on and the output was less than 1/2 way up. Both the parametric and graphic EQs were on, and the compresser was fully engaged. The Tube M.P. was left plugged in all night after a jam late last night. I also noticed last night (after first hooking up this brand new rig 2 nights ago) that something is up with the input jack on the Strobostomp-- either there is a short in the jack itself or the cable is bad (when I jiggled it, it would go to less than 1/2 volume and I heard static coming through the amp (the static I heard with hands off of the tuner input jack, not while fiddling with it.) Did the tube overheat in the Tube M.P and shut itself off? Did the amp overheat and shut down the speakers? Do I have a bad outlet where I plugged in the Tube M.P.? What is your opinion and what should I do? Try running direct without the ART .... we can try to narrow things down a bit. I was talking to a salesman at the GC in town and he said a bass player friend had a high end bass rig that had an auto shutoff if it were overdriven. Maybe this is what's happening, here. I haven't had time to check it out since last you posted, but plan to some time this week. |
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Post by RC on Jun 13, 2006 11:55:26 GMT -7
Myles,
I just got a message that my new Maz 18 NR head is shipping to me this week and I'd like to order in some really good tubes to have on hand to experiment with. Could you make some suggestions on ones you think I should try.
I asked you about tubes for my Ghia a few months ago and your suggestions were perfect. The GT EL84S in a 5 you matched for me really brought the Ghia alive. If these are a good match for the Maz can they be ordered in a matched quad set and split between two amps.
I play an LP and mostly Blues and Rock.
Thanks again,
Russ
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Post by myles on Jun 14, 2006 12:12:42 GMT -7
Myles, I just got a message that my new Maz 18 NR head is shipping to me this week and I'd like to order in some really good tubes to have on hand to experiment with. Could you make some suggestions on ones you think I should try. I asked you about tubes for my Ghia a few months ago and your suggestions were perfect. The GT EL84S in a 5 you matched for me really brought the Ghia alive. If these are a good match for the Maz can they be ordered in a matched quad set and split between two amps. I play an LP and mostly Blues and Rock. Thanks again, Russ Russ, The amps as shipped are pretty great stock. I would play it for a while and then give me a call and we can talk options such as 5751's in V1 or the phase inverter. The Doc has been shipping some amps with Svetlana 12AX7's and the tests I have been doing on these new Svets have shown them to be pretty darn impressive tubes. They are different than the ECC83S that used to be stock so let me know which tube ships in the amp. |
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Post by RC on Jun 14, 2006 13:29:36 GMT -7
Myles, I just got a message that my new Maz 18 NR head is shipping to me this week and I'd like to order in some really good tubes to have on hand to experiment with. Could you make some suggestions on ones you think I should try. I asked you about tubes for my Ghia a few months ago and your suggestions were perfect. The GT EL84S in a 5 you matched for me really brought the Ghia alive. If these are a good match for the Maz can they be ordered in a matched quad set and split between two amps. I play an LP and mostly Blues and Rock. Thanks again, Russ Russ, The amps as shipped are pretty great stock. I would play it for a while and then give me a call and we can talk options such as 5751's in V1 or the phase inverter. The Doc has been shipping some amps with Svetlana 12AX7's and the tests I have been doing on these new Svets have shown them to be pretty darn impressive tubes. They are different than the ECC83S that used to be stock so let me know which tube ships in the amp. Thanks Myles, I'll wait until I get some time in on it before I do anything. I guess I shouldn't be surprised to here the Doc sends his amps out with really good tubes in them. He's just different than all the other amp manufactures I've dealt with in a very good way. |
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Post by douge on Jun 16, 2006 18:40:58 GMT -7
Myles,
I have a Dr. Z KT-45 Amp and want to hook two 8-ohm speaker cabinets to it. It only has a 4,8,16 ohm jack. One cabinet has parallel jacks on it. Is this the better way or would a Heavy Duty Y-Cord be the better way to hook it up and still have good sound from both cabinets??
Thanks,
Douge
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Post by billyguitar on Jun 17, 2006 0:37:05 GMT -7
Forgive me Myles for jumping in here but Douge may be anxious to try out his rocking machine soon and you may be unable to respond, for reasons beyond your control, as quickly as he'd like.
Run a cord out of the 4 ohm tap and into cab A. Using the parallel jack from cab A run a cord to cab B. The amp will see 4 ohms. There would be no benefit to using a Y cord that I've ever heard of.
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Post by douge on Jun 17, 2006 4:37:11 GMT -7
Forgive me Myles for jumping in here but Douge may be anxious to try out his rocking machine soon and you may be unable to respond, for reasons beyond your control, as quickly as he'd like. Run a cord out of the 4 ohm tap and into cab A. Using the parallel jack from cab A run a cord to cab B. The amp will see 4 ohms. There would be no benefit to using a Y cord that I've ever heard of. Thanks billyguitar. I appreciate your reply! |
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Post by mike33 on Jun 18, 2006 6:30:41 GMT -7
Myles,
I have a Dr. Z MAZ18 head amp with Reverb. The Reverb I use once in a blue moon.
Now I will have to re-tube the amp due to 1 1/2 year of playing the MAZ a lot.
My question is, have the tubes which are used for the Reverb (I believe V3 and V4) some impact on the sound even if I have the Reverb on 0?
By the way I thought I will re-tube the MAZ 18 with the following tubes:
V1: EI ECC83
V2: EI ECC83
V3: Leaving the original one (Sovtek 7025 / 12 AX7WB)
V4: Leaving the original one (12 AT China)
V5: SAG-AX7-MPI (already ordered over GT homepage)
V6 and V7: GT EL84S (#6)
V8: GT-5AR4/ GZ34 (already ordered over GT homepage)
Any suggestions or comments to this setup are welcome!
Last thing.
Somewhere in this forum I saw that people using "balanced" tubes for the V1! Is this useful and bring some advantages?
Thanks,
Michael
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Post by myles on Jun 19, 2006 12:21:54 GMT -7
Myles, I have a Dr. Z KT-45 Amp and want to hook two 8-ohm speaker cabinets to it. It only has a 4,8,16 ohm jack. One cabinet has parallel jacks on it. Is this the better way or would a Heavy Duty Y-Cord be the better way to hook it up and still have good sound from both cabinets?? Thanks, Douge Doug, I find a good Y adaptor in the 4 ohm jack is the easy killer solution. |
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Post by myles on Jun 19, 2006 12:24:21 GMT -7
Forgive me Myles for jumping in here but Douge may be anxious to try out his rocking machine soon and you may be unable to respond, for reasons beyond your control, as quickly as he'd like. Run a cord out of the 4 ohm tap and into cab A. Using the parallel jack from cab A run a cord to cab B. The amp will see 4 ohms. There would be no benefit to using a Y cord that I've ever heard of. Billy .... generally a cool idea but some cabs are wired sort of strange and documented in an unclear manner. If the fellow wants to use your method I would wire things up your way and then meter the 1/4" jack end that goes into the amp and look to make sure it is about 3.7-4.2 ohms or so. Then things are truly in parallel. |
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Post by myles on Jun 19, 2006 12:28:13 GMT -7
Myles, I have a Dr. Z MAZ18 head amp with Reverb. The Reverb I use once in a blue moon. Now I will have to re-tube the amp due to 1 1/2 year of playing the MAZ a lot. My question is, have the tubes which are used for the Reverb (I believe V3 and V4) some impact on the sound even if I have the Reverb on 0? By the way I thought I will re-tube the MAZ 18 with the following tubes: V1: EI ECC83 V2: EI ECC83 V3: Leaving the original one (Sovtek 7025 / 12 AX7WB) V4: Leaving the original one (12 AT China) V5: SAG-AX7-MPI (already ordered over GT homepage) V6 and V7: GT EL84S (#6) V8: GT-5AR4/ GZ34 (already ordered over GT homepage) Any suggestions or comments to this setup are welcome! Last thing. Somewhere in this forum I saw that people using "balanced" tubes for the V1! Is this useful and bring some advantages? Thanks, Michael Michael, V3 should be the 12AT7 not V4. V3 is the reverb driver. Using a balanced or matched tube in V1 or V2 has no benefit other than making your wallet a bit lighter. The two sides of the triodes in V1 and V2 are used for different functions. If you said anything on your order with my name on it in the comment section then they will route the order to me and I will hand pick the stuff for the order. The front office guys know to do this for Z forum folks and some of my GAB clients. |
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Post by billyguitar on Jun 19, 2006 12:44:09 GMT -7
Sorry Myles. I was just operating from my probably limited experience and shouldn't have. All I've ever seen is simple wiring in cabs but I have no doubt you're right. I won't butt in again.
I also didn't consider the possibility that the speaker cabs could end up out of phase.
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Post by jwr on Jun 19, 2006 19:04:15 GMT -7
Myles, do you have any suggestions for 6V6's in a Z-28? Mine are starting to give me a harsh and unpleasant kind of distortion, even at very low settings(all knobs set around 8 o'clock) and I've replaced all tubes other than the output section. I like the tone of the stock amp and may just get another set of 6V6R's. Is there anything else out there that you'd recommend? NOS? JJ? Thanks for your help
Jason
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Post by myles on Jun 20, 2006 12:16:23 GMT -7
Sorry Myles. I was just operating from my probably limited experience and shouldn't have. All I've ever seen is simple wiring in cabs but I have no doubt you're right. I won't butt in again. I also didn't consider the possibility that the speaker cabs could end up out of phase. Billy .... if the cabs were out of phase there would be issues with my method or your method. Your method could be a lot easier as it it would take is another speaker cable. So ... in the future, please feel free to "butt in" as much as you'd like to. There is more than one way to skin a cat as they say and I learn a lot in this forum from folks in here like you too! |
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Post by myles on Jun 20, 2006 12:17:56 GMT -7
Myles, do you have any suggestions for 6V6's in a Z-28? Mine are starting to give me a harsh and unpleasant kind of distortion, even at very low settings(all knobs set around 8 o'clock) and I've replaced all tubes other than the output section. I like the tone of the stock amp and may just get another set of 6V6R's. Is there anything else out there that you'd recommend? NOS? JJ? Thanks for your help Jason If I am going to gig with the amp or have it on the road at all I go with either the JJ 6V6 or the 6V6R (EH) as they are available on the road easily and sound pretty darn nice. I prefer a 6-7 rating personally in either of these tubes in the Z-28. |
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Post by billyguitar on Jun 20, 2006 12:56:50 GMT -7
Thanks Myles!
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Post by jwr on Jun 20, 2006 17:57:39 GMT -7
Thanks Myles!
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Post by rcrecelius on Jun 22, 2006 8:39:14 GMT -7
Myles,
Is it necessary/recommended to re-bias your power tubes(6v6 in this case. Z28) as they get older?
In my Z28, I started with a 12AT7 PI which cleaned it up a little but as time went on, I lost some sustain/gain and stuck a 5751 in there, which brought it back to life for a couple months.
Now, Im facing the lost sustain/gain problem again. I do have a bias tool ordered so hopefully I will get to set the bias before this weekend...I also have some TungSols ordered.
I run this amp pretty hard...controls all above 12 with a considerable boost in front at least 3 nights a week...how long should I expect a set of 6v6's to last under those circumstances?
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Post by myles on Jun 22, 2006 8:56:31 GMT -7
Myles, Is it necessary/recommended to re-bias your power tubes(6v6 in this case. Z28) as they get older? In my Z28, I started with a 12AT7 PI which cleaned it up a little but as time went on, I lost some sustain/gain and stuck a 5751 in there, which brought it back to life for a couple months. Now, Im facing the lost sustain/gain problem again. I do have a bias tool ordered so hopefully I will get to set the bias before this weekend...I also have some TungSols ordered. I run this amp pretty hard...controls all above 12 with a considerable boost in front at least 3 nights a week...how long should I expect a set of 6v6's to last under those circumstances? I actually do check the bias on my class A/B amps when they are in hard use every three or so months. This lets me know if a tube of a set went south due to some sort of longer term defect or the amp took a hard hit on a truck or something that can mess up a set of output tubes. It also lets me compensate for wear over time. |
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Post by rcrecelius on Jun 22, 2006 9:16:44 GMT -7
thanks
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Post by RC on Jun 22, 2006 20:26:44 GMT -7
Myles, I just got a message that my new Maz 18 NR head is shipping to me this week and I'd like to order in some really good tubes to have on hand to experiment with. Could you make some suggestions on ones you think I should try. I asked you about tubes for my Ghia a few months ago and your suggestions were perfect. The GT EL84S in a 5 you matched for me really brought the Ghia alive. If these are a good match for the Maz can they be ordered in a matched quad set and split between two amps. I play an LP and mostly Blues and Rock. Thanks again, Russ Russ, The amps as shipped are pretty great stock. I would play it for a while and then give me a call and we can talk options such as 5751's in V1 or the phase inverter. The Doc has been shipping some amps with Svetlana 12AX7's and the tests I have been doing on these new Svets have shown them to be pretty darn impressive tubes. They are different than the ECC83S that used to be stock so let me know which tube ships in the amp. Myles, My Maz Jr NR shipped with a JJ ECC83S in the V-1 & V-2, Sovtek 12AX7LPS in the V-3, a pair of GT EL84S #6, and a Sovtek 5AR4. I'm getting a lot more hissing out of this amp than what I'm sure is normal and the overall tone is kind of sterile or flat and one dimensional leaning toward harsh. I've tried a lot of deferent settings and guitars this week with it and I've not found anything you could describe as creamy or smooth. I think maybe one or more of the tubes didn't like the road trip out here in the back of the FedEx truck. If you could give me some ideas about what would cause the hissing and how to wake up the tone I would really appreciate it. |
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Post by myles on Jun 23, 2006 8:15:39 GMT -7
Russ, The amps as shipped are pretty great stock. I would play it for a while and then give me a call and we can talk options such as 5751's in V1 or the phase inverter. The Doc has been shipping some amps with Svetlana 12AX7's and the tests I have been doing on these new Svets have shown them to be pretty darn impressive tubes. They are different than the ECC83S that used to be stock so let me know which tube ships in the amp. Myles, My Maz Jr NR shipped with a JJ ECC83S in the V-1 & V-2, Sovtek 12AX7LPS in the V-3, a pair of GT EL84S #6, and a Sovtek 5AR4. I'm getting a lot more hissing out of this amp than what I'm sure is normal and the overall tone is kind of sterile or flat and one dimensional leaning toward harsh. I've tried a lot of deferent settings and guitars this week with it and I've not found anything you could describe as creamy or smooth. I think maybe one or more of the tubes didn't like the road trip out here in the back of the FedEx truck. If you could give me some ideas about what would cause the hissing and how to wake up the tone I would really appreciate it. First we need to find what may be an offending preamp tube. Grab a known good 12AX7 and try it in each position, one position at a time. If you had hum rather than hiss then it could be an output tube that died in transit. |
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