Hey All - I've got an '06 Z28 that I'd like to re-tube/tune up. I purchased a VHT Bias unit and went to check the bias of the current set of power tubes (GT's). When I powered on the amp and stand by, I had one tube glow bright white and a loud hum came out of the speaker for about 2-3 seconds, then the fuse blew.
I removed the bias tester, put a new fuse in, and re-installed the power tubes. Now I notice that one of the power tubes does not light up at all when the amp is turned on. I plugged a guitar in and it makes sound just as normal but I'm wondering about that tube. I swapped positions of the power tubes and still the one tube does not glow at all.
Does anyone have any insight as to why this is?
I have a brand new set of matched JJ's ready to go in, but I want to figure this out before I put them in and possibly damaged the new set.
Thanks in advance for any help!
"When this cruel, cruel, bloody competition's over...all that will be left is cosmic vibration, LOVE, and my song!" - Paul Pena
Well if swapping the tube positions the un-lite tube moves to the next slot then it's a bad tube. If the un-lite tube now lights and the other that was moves doesn't then it's an internal issue. What could have happened that caused that tubes filament to fail is hard to say.
I have has issue with one socket needing to retensioned to get to work...just did it today as a matter of fact...
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Post by premiumplus (Dave) on Mar 25, 2019 17:30:02 GMT -7
I just got an old 1981 Carvin and one of the output tube sockets was so worn that the keyway allowed the tube to be inserted in the wrong orientation. Surprise...the heater didn't work! I re-aligned it and all is well again.
"Tone, tone, tone, tone. Is there a substitute?" -Dr.Z
Those keyways don't wear all that much. The real defect is that some companies use really cheap sockets with a sloppy fit to begin with. The worst I have seen were ceramic, although that doesn't mean ALL ceramics are bad. They just vary more from part to part. Also the way you remove tubes determines how quickly they become loose. I've seen it demonstrated and recommended that you wiggle the tube in a circular motion when pulling them out. That, with an excessive movement, is the worst thing you can do. It is best to just SLIGHTLY wiggle them from side to side as you pull. Also make sure the pins are straight when inserting them. A pin straightener tool is handy for this. It will eliminate the socket being used as a "straightener tool" which will deform it.
Loose pins usually come from "tube rolling" which I don't like. Although there are some newer tubes with smaller diameter pins that will require tweaking the socket for a proper fit. What a pain. I might try 2 or 3 different tubes but that is all. If I don't hear a significant improvement by then I go back to what Doc Z originally used.
premiumplus (Dave): Due or do? Which or witch? Knob or nob? Their or there? Bass or base? Too much time on my hands...
May 24, 2020 6:31:30 GMT -7
roscoenyc: Ah, the incessant tire kickers. oh jeez.
May 25, 2020 6:57:46 GMT -7
GuitarZ: Needed some noise to fill a break in a tune I'm recording. It was too quiet. Just happened to have some High Quality Dr Z Ghia noise to fill the void. "Heal Your Sound with Dr Z! It's not just a guitar tone prescription!"
Jun 13, 2020 8:29:27 GMT -7
GuitarZ: Must be great to be a skunk. Eating bird food about 10' from our sun room. I'm clapping and yelling. At best, it might have given me one "yea what?" look while continuing to dine. At one point, there were two skunks and two racoons.
Jun 14, 2020 18:49:33 GMT -7
captainron (Ron): Hueter Toledo, just another business of today that doesn't care about tomorrow!
Jun 25, 2020 12:51:43 GMT -7
KeithA: Hueter Toledo....that business is gone to the dogs
Jun 26, 2020 8:22:26 GMT -7
easyed: Guitar Z, I encountered to ultimate garbage raiding combo once. We'd been having problems with the garbage cans being raided by raccoons for weeks. Late in the evening I heard rattling at the cans. I went out and found that he'd allied with a skunk. "OK"
Jun 30, 2020 11:40:27 GMT -7
GuitarZ: EasyEd - Someone at work topped us both. The inside of their car had been somewhat ransacked. They were blaming their son. They checked the video. It was a Bear! I'll stick with the racoons, skunks, foxes, and squirrels.
Jul 1, 2020 16:47:50 GMT -7
bigboki: In this age and time when everybody are struggling and especially S&Ms I am amazed to see that kind of ignorance. I am really sorry for your experience dear Dr Z but it is for the better. You don't want to do business with those kind of people anyway.
Jul 4, 2020 8:17:40 GMT -7
GuitarZ: Didn't want to restart the plumbing thread, so I figured I'd ShoutBox this. How the heck does cleaning the aerator on a faucet cause a leak to start under the faucet? Huh? Arggggh!!!!
Jul 10, 2020 7:40:17 GMT -7
The Bad Poodle Experience: well, Mike, it shouldn't have been the cause of a leak. double-check your work.
Jul 10, 2020 12:56:49 GMT -7
GuitarZ: I updated in the Plumbing thread that the Moen website says that a faulty aerator can cause a handle/base leak. Eiyy! I really don't understand how plumbing works. I was ready to double check all connections. But, the leaking stopped with cleaned Aerator.
Jul 11, 2020 18:13:56 GMT -7
jhen86 (jordan): Just got an email from Sweetwater rep that Z Wreck Jr's are back in stock. Just wanted to give everyone a heads up.
Jul 28, 2020 10:57:28 GMT -7
Lefty: Say a prayer for me fellas, I'm going to replace a bathroom faucet this weekend.
Jul 30, 2020 8:26:34 GMT -7
GuitarZ: Make sure you use your plumbers tape.
Jul 30, 2020 12:21:50 GMT -7
doctorice: Just replaced a kitchen faucet. Hardest part was getting the old one out -- had a weird flange on it. Good luck, Matt!
Jul 31, 2020 8:02:26 GMT -7
steiner: Just payed the plumer to replace a faucet and drains. Finally have non-leaking, speedy draining sinks!!!
Aug 4, 2020 8:08:03 GMT -7
GuitarZ: After finally training myself after 4 days to not bother trying to turn on the guest bathroom light because of the power outage, I just found myself bracing for the sound of the generator as I opened the garage door and it's now quiet. Power Back!
Aug 7, 2020 16:51:10 GMT -7