I just got a weber biasrite tool..and a new matched set of GT kt 66 HP's (rating 4) ......When I tested them in the RT 66, the bias was slightly different for each tube when I used the AB switcher...........is this normal for matched tubes? Initially and prior to changing the bias, One tube hovered around 31.5 mA and the other around 33.0 mA...as I adjusted the bias, they maintained this differential..........
I am completely new at servicing my own equiptment so I am not sure what the tolerance is for matched tubes........how matched is matched in mA's? Do they have to be exact?
my amp tech, a bit old school, but still makes jt45 and deluxe reverbs and supers for people and repairs amps etc.. been at it a long time , made this comment when i bought and had him bias a new set of groove tube E34Ls #6 to be biased at 36 ma : "when i biased one of the tubes at 36 the other one whould come in at only 33..it should be as close as "2" if they are professionally matched.." but the amp sounds great, hah.
thanks fellas...........I kinda had a feeling that was gonna be the case, but I wanted to make sure for future reference. My ears are telling me everythings fine! My Rt 66 has that BIG "GROWL" again win pushed with humbuckers..........nuthin' like a fresh set "o" tubes!
This is very normal but you also have to remember that what you are measuring is static match at idle. You want to stay with 20% or else you can have hum issues, but on tubes which are dynamically matched rather than statically matched, when you look at the amp on a scope you will see dynamically matched tube be exactly matched. This is generally not the case with tubes which are simply static matched. But ... to dynamically match tubes takes about $400,000 worth of equipment and this may be a bit outside of the reach of most tube vendors.
GuitarZ: Best Pandemic Comment - Delivery guy shows up. As we're social distancing, I look at myself in brown loafers, black socks, gym shorts, t-shirt and say "I realize this is not my best look". His response "You can wear whatever you want to the apocalypse."
May 1, 2020 14:39:30 GMT -7
roscoenyc: read a newspaper.
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May 21, 2020 8:19:01 GMT -7
premiumplus (Dave): Due or do? Which or witch? Knob or nob? Their or there? Bass or base? Too much time on my hands...
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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
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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