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Post by walt on Feb 11, 2017 8:24:18 GMT -7
Last night while playing i had a quick volume drop,and within 30 seconds a loud hum.I powered down immedietly,figured no big deal,i'll swap the bad tube tomorrow.I just changed all 5 in this order-2 power,2 pre,rectifier.My replacement rectifier is a JJ GZ34.Still have a really loud hum/buzz.Any ideas? Jewel light comes on,all replacement tubes look normal-the old rectifier looked like it was more lit up than usual though..
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Post by DRZ on Feb 11, 2017 8:52:17 GMT -7
Boy that sounds like you lost a 6L6. Drop in power then hum. You might have burned out a 470 ohm 3 watt screen resistor when the tube failed, they act like a fuse to protect your Output transformer. This will keep a good tube from now working in that spot, hence the hum still present. If that is the case , that will need changing, it is mounted on the 6L6 socket pins 6 to 4. I use Blue Flame proof resistors in that spot, so look for one to be discolored/burnt.
Z
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Post by Deleted on Feb 11, 2017 11:49:05 GMT -7
That's some pretty bad @.s.s. customer service, right there. On a Saturday, no less!
Why buy anything else?!?!
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Post by walt on Feb 11, 2017 12:00:12 GMT -7
Thanks for the help Doc(and quick too)I took a look,but if there's something there I don't have the technical knowledge to I.D. it.I am going to fill out a repair form and send it over to you guys to have it fixed up. So are the new tubes I put in today ruined?I should buy a tube tester.And a cable tester,and mic cables..what a week I'm having!
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Post by nmz on Feb 11, 2017 12:31:30 GMT -7
Drag, hoping for a speedy recovery.
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Post by "Z" Steve on Feb 11, 2017 12:39:27 GMT -7
My first thought when I saw the thread title was Frank Zappa for some odd reason. But re the responses, isn't great that the Dr. works weekends!
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Post by kc on Feb 12, 2017 9:54:31 GMT -7
Thanks for the help Doc(and quick too)I took a look,but if there's something there I don't have the technical knowledge to I.D. it.I am going to fill out a repair form and send it over to you guys to have it fixed up. So are the new tubes I put in today ruined?I should buy a tube tester.And a cable tester,and mic cables..what a week I'm having! Why not take a pic or two when you have it apart and send it to the Z repair email addy - they would likely be able to spot the screen resistor and see whether its failed. kc
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Post by DRZ on Feb 12, 2017 10:33:45 GMT -7
Thanks for the help Doc(and quick too)I took a look,but if there's something there I don't have the technical knowledge to I.D. it.I am going to fill out a repair form and send it over to you guys to have it fixed up. So are the new tubes I put in today ruined?I should buy a tube tester.And a cable tester,and mic cables..what a week I'm having! Why not take a pic or two when you have it apart and send it to the Z repair email addy - they would likely be able to spot the screen resistor and see whether its failed. kc +100 that will work. Make sure both output tube sockets are clear in the pic.
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Post by walt on Feb 12, 2017 18:39:23 GMT -7
Thanks for the tip,pics are on the way.
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Post by purpletele on Feb 12, 2017 20:36:18 GMT -7
Show us your guts Walt
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Post by Deleted on Feb 12, 2017 21:13:53 GMT -7
If your Maz 8 needs to seek higher ground, send it to San Diego...
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Post by purpletele on Feb 12, 2017 21:45:51 GMT -7
If your Maz 8 needs to seek higher ground, send it to San Diego... Holy Cow! I'm loading up. Frank somehow the amps multiplied, I'm heading down to SD with a six pack of amps and three guitars.
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Post by Deleted on Feb 12, 2017 22:14:23 GMT -7
If your Maz 8 needs to seek higher ground, send it to San Diego... Holy Cow! I'm loading up. Frank somehow the amps multiplied, I'm heading down to SD with a six pack of amps and three guitars. I have 12 guitars and three amps. Give me a few days and I might be able to get us back to 1:1.
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Post by purpletele on Feb 14, 2017 22:19:35 GMT -7
walt, We are anxiously waiting for photos.
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Post by walt on Feb 15, 2017 18:38:55 GMT -7
Sorry,workworkwork.So Tuesday night after takeing the chassis out for pics,I was carrying it to a better light source,and noticed a pinging noise-when I looked down I saw a few small blue sparks accompanying the pinging-closer inspection revealed a break that was rubbing together.I have exchanged e-mails with Don in repairs and will be shipping in the next few days. Pic one uses a subtle green arrow to highlight the (blurry)close up in pic two
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Post by purpletele on Feb 15, 2017 19:11:53 GMT -7
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zwak
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Post by zwak on Feb 22, 2017 12:39:40 GMT -7
Ok, there are 5 connections to this turret. Should the connection to the electrolytic be done to the top of the turret verses down below the three red wire's and releasing the strain. Also Walt, are you manhandling the head to where your bouncing the parts on the board...sorry just trying to understand!
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Post by walt on Feb 22, 2017 18:28:10 GMT -7
Nope,I am a home player,2 years in and the Therapy hasn't left the room.And I do skilled labor for a living,so no mishandleing from me.Some times a part just goes bad.I see it sometimes at my job.
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Post by muzacman02 "Jamie" on Feb 23, 2017 23:05:11 GMT -7
That is service at its FINEST and amps that when this does happen they will do WITs, Very Rare Occurance and was most likely the failed tube , Great Amp By The way!!!
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Post by walt on Mar 3, 2017 16:32:40 GMT -7
My Therapy is shipping back to me Monday-boy do I miss it.My back up amp is an 80 dollar SS vox run through my Z-best 1x12.Not horrible,but....No,it's horrible. Quick turnaround by the Fellas(and Fellettes?)in the repair shop.
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Post by purpletele on Mar 3, 2017 19:44:26 GMT -7
My Therapy is shipping back to me Monday-boy do I miss it.My back up amp is an 80 dollar SS vox run through my Z-best 1x12.Not horrible,but....No,it's horrible. Quick turnaround by the Fellas(and Fellettes?)in the repair shop. Walt that is great. You may be a candidate to build your own back up and Lose the Vox
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Post by simpleton on Mar 3, 2017 22:26:09 GMT -7
Great service is getting harder to find....but somehow the Z shop seems to get it right again and again. It will sound so good when it returns....the wait makes it sweeter.
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Post by walt on Mar 4, 2017 9:38:43 GMT -7
Idk about me building an amp-I work with my hands and have mechanical apptitude/tool knowledge,but There is A LOT about electronics I don't know,and my soldering skills(with an iron,with a torch I'm very good)are iffy. Hopefully by the summer I'll scrape up the change to pick up a Maz 8 or Ghia.
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Post by purpletele on Mar 4, 2017 10:18:39 GMT -7
Idk about me building an amp-I work with my hands and have mechanical apptitude/tool knowledge,but There is A LOT about electronics I don't know,and my soldering skills(with an iron,with a torch I'm very good)are iffy. Hopefully by the summer I'll scrape up the change to pick up a Maz 8 or Ghia. Walt, I have found it to be a very satisfying hobby for someone who builds things for a living. I have built 4 great amps and there are concepts that I still do not understand, but most of the kits that you get have already done the math and design so it's much more forgiving that one might think, Take care
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Post by walt on Mar 8, 2017 18:50:11 GMT -7
Got my Therapy back today,3 week turnaround-I thought it would be twice the time,I picture all employees buzzing like bees making Cures.Great packing,quick and professional turnaround,amp sounds awesome as usual.I could not be happier with the service of everyone at the Z shop.
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Post by SukeyTawdry on Apr 7, 2017 17:08:25 GMT -7
Got my Therapy back today,3 week turnaround-I thought it would be twice the time,I picture all employees buzzing like bees making Cures.Great packing,quick and professional turnaround,amp sounds awesome as usual.I could not be happier with the service of everyone at the Z shop. So Walt, did the good Doctor ever tell you the cause? That component wasn't a grid resistor. Would a failed tube cause a capacitor's lead to break like that?
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Post by walt on Apr 7, 2017 17:59:38 GMT -7
Actually,no.I got the amp back with the tubes I sent it with,(all factory except for the rectifier)and no charge or return shipping bill,so I was happy about that-I expected the repair to be covered under the warrenty,but not the shipping(80 bucks from me to them) and wasn't sure about the tubes being the cause/bad.I have the 5 tubes that were in there when the amp went south,but I am going to disspose of them and get new ones.
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Post by DRZ on Apr 8, 2017 2:48:27 GMT -7
Actually,no.I got the amp back with the tubes I sent it with,(all factory except for the rectifier)and no charge or return shipping bill,so I was happy about that-I expected the repair to be covered under the warrenty,but not the shipping(80 bucks from me to them) and wasn't sure about the tubes being the cause/bad.I have the 5 tubes that were in there when the amp went south,but I am going to disspose of them and get new ones. Walt, Don worked on your amp and if he sent it back repaired with your old tubes, then the old tubes are OK. Having spare tubes tubes us always a great idea. Play your amp for a while it should be just fine. The Hum was from a broken filter cap lead, and that is a first for me. That failure did not harm the tubes. Z
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Post by SukeyTawdry on Apr 8, 2017 4:42:37 GMT -7
Actually,no.I got the amp back with the tubes I sent it with,(all factory except for the rectifier)and no charge or return shipping bill,so I was happy about that-I expected the repair to be covered under the warrenty,but not the shipping(80 bucks from me to them) and wasn't sure about the tubes being the cause/bad.I have the 5 tubes that were in there when the amp went south,but I am going to disspose of them and get new ones. Walt, Don worked on your amp and if he sent it back repaired with your old tubes, then the old tubes are OK. Having spare tubes tubes us always a great idea. Play your amp for a while it should be just fine. The Hum was from a broken filter cap lead, and that is a first for me. That failure did not harm the tubes. Z Thanks for the reply, good Doctor. But do you have any idea what could have caused the lead to break like that? It seems unusual, unless his cat chewed on it or something ; )
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Post by Lefty on Apr 8, 2017 6:46:41 GMT -7
Walt, Don worked on your amp and if he sent it back repaired with your old tubes, then the old tubes are OK. Having spare tubes tubes us always a great idea. Play your amp for a while it should be just fine. The Hum was from a broken filter cap lead, and that is a first for me. That failure did not harm the tubes. Z Thanks for the reply, good Doctor. But do you have any idea what could have caused the lead to break like that? It seems unusual, unless his cat chewed on it or something ; ) I've seen it many times over the years, when bending the wire leads on a component, it stresses the wire. Most can handle being bent 2 or 3 times, however it still weakens the lead but doesn't always break it. And then if you apply constant heat and some minor movement, these things happen.
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