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Sounds like the last time I was at Guitar Center.

As I'm no electronics tech nor am I particularly electrically inclined I make it a point to watch this video every so often to ensure I don't mess up any of my amps when I set the BIAS. Thanks for all the info you give and for the great service!

Just curious - why do you keep only only one hand on the inside and the other hand "in your pocket or out of the way" - do you get shocked if you touch with 2 hands??

What a positive human being👍

HI EDDIE... I just had a horrible experience with the Tube Depot, I ordered a quad of matched JJ EL 34s, (32 32 32 31mv), I noticed a glassy tone right off the bat, but assumed it was the break-in period, this went on for several months, after checking the bias which was at 90 MV per side, I then decided to swap the right and left side just to see if there was an improvement, I turned on the amp and the right side was red plating bright orange, I noticed the values in this video are lower than the 32mv, please let me know if you suspect anything... I should have went with you guys right from the beginning, if i end up getting my money back i will 👍

Eddie!! Dude I just happened into this. Thank you for being such a great guy. You’ve helped my biz so much through the years.

The special tool plugged between the socket and power tube shows current directly and is super handy. The tool uses a small reference resistor across which a DC voltage measurement is translated to current by the meter. It really is a great solution. That convenience comes at a price, though, and multiple versions will be needed for different amps. There is another solution. 1. Use secure clip-style leads for all measurements on your meter. The power tube plate is very simple to locate. Clip the MINUS lead there, assuring it is very secure. The output transformer’s center tap takes a bit of effort. The easiest place to access it is the + terminal(s) of the largest filter cap(s), the chassis mounted ones on a Marshall. Clip the PLUS lead there. WITH THE AMP OFF, set the meter to resistance and note the value ACCURATELY as R. Expect a value in the range of 30-50 ohms. 2. Change the meter to DC volts without touching the clipped-on probes. Power and warm the amp. Note the voltage accurately as V. (for example 1.94Vdc) Keep in mind though that each probe is tied to a point with 400-ish volts so be safe and secure. Now, for some math. 3. With V and R noted accurately, (V / R) = the bias current is read in Amperes, such as 0.040 for 40mA bias. Adjusting the bias pot will change the small DC Voltage. A higher voltage = higher bias but the equation needs to be repeated for every change. ***There is no direct readout for current. I write a list of voltages with their resulting number of mA in the equation and put this info on a piece of paper tape stuck to the inside of the chassis. It becomes second nature.

Clean the glass of any tube or lamp you replace with your fingers. So easy.

Just a safety note: the reason to only work with one hand at a time is so that if you get a shock, it doesn't pass from one hand to the other and go through the heart region. This can cause defibrillation and all that comes with it... A current passing through one hand and exiting a foot is much less likely to be fatal...

This all works for 6L6 power tubes and 5AR rectifier in a black panel vintage fender?

What a gem!!!

Isn't it advantageous to have a bias probe for each tube? If so would you use a bias meter for each power tube, or do one at a time and power amp off before disconnecting probe from meter and reconnect to other bias probe,

Very friendly, knowledgeable and honest people. Excellent products and prices too.

Awesome video man email learning this process a lot easier! Thank you

You're a natural teacher, thank you 👍

Cradles are simple to build.

So clear and concise. Thank you so much for putting the video together. I do have one question though... do I need to measure both power tubes if I have a matched set? I only have one of the pro bias meter tools.

Beautiful, I learned everything I need to about changing my tubes thank you

was looking for how to buy a jj one and came across this gem in euro tubes amazing

Great video, very well explained! I have a question about the mA reading on my EL34 tubes. One tube reads 45 mA with a plate voltage of 496, and the other reads 35mA with plate voltage of 498. Is that normal for the tubes to have that much of a difference in current mA? They are not a matched set of tubes and I am using the Pro One Bias probe. Any advice would be welcome.

This company has great products and great customer service. Good quality! 👍👍

will the octal power tube unit work on 6SN7/6SL7 ( not considered power tubes ) ? EDIT: i just looked at the pinouts and the answer is no....that's ok, i will figure something out

I've been using a Pro One (octal) bias probe now for a couple years and I love it. If you're working on more than 1 or 2 amps then I highly recommend grabbing one of these. I has been completely reliable. My only beef (if you're listing ET), is the font labeling on the meters (the little plastic tape labels). I'm getting older and couldn't read that font without my glasses. I relabeled it with a 'normal' font and it's perfect. Not a big deal really, but ...

Hi. Would it be a good idea to turn the bias trim pot all the way down before turning the amp on so the new power tubes won't have a voltage peak that could damage them? Thank you! Great video!

Awesome video! Do you need two probes or is it enough to use Only one?

How many pro1’s will i need for a 100watt amp? 4?

Is this a production amplifier by JJ Tubes or Eurotubes or just a one off deal, etc? Is "Bob" still around Eurotubes? I've been out of the loop for several years now. Thanks

I have a question. Is the plate current the bias setting? That's what it looks like in this video. I have a 100 watt Marshall amp and my plate current is 60. Is that my bias setting? My plate voltage is 485.

Such a great vid. Come back to it a few times...Good work Eddie!!

Was there a snare drum in the room?

you guys need more views! This is Jason I know you probably don’t remember me but you help me out with the right set of tubes for my mess Boogie dual rectifier. I went with the KT 77’s since they run hotter than 6L6. I also buy all my preamp tubes from you as well and you were always really helpful over the phone to answer any question I had. That kind of customer service is rare these days and greatly appreciated. I’ll be calling you guys again soon for another re-supply.

I just prop the chassis in the headshell it came out of. I'd rather buy a set of EMG's or new tubes instead of that head stand for a chassis. But the tip on some books is valid!

Some techs say that using tubes that aren't perfectly matched are better for harmonics, what do you think?

Great video. Great step-by-step! Thanks so much!

You're committing the cardinal sin of touching your tubes! Doesn't the oil from your fingerprint change the way heat dissipates?

Extremely helpful video, thank you.

It would be great to know when these will be back in stock i need one or two.

I watch this video every time before biasing... Super super useful, and definitely makes Eurotubes a company worth supporting whenever I can

Hey mate. Thanks for the video. I'm the kind of person that would stop and bring the amp into the shop, but the coronavirus makes that impossible. I have an Ampeg B15 S, a power tube went out, and I have some NOS RCAs to replace it. Wondering if you by chance have that or similar amp around because I'm looking for a step-by-step so I don't electrocute myself, but no one has made instructions for that one yet. Cheers.

Where can I buy this? Everyone seems to be out of stock for some time.

Hi, great video, I have 2 questions, do you have to set all knobs to 0? Also does the bias change by itself with time? Lets say 2 years after? Thanks.

How long are you supposed to let the app warm up before you take a bias reading?

Hello can you maybe tell me what may be wrong with my amp. When I turn on the peavey triple x amp head, my preamp tubes turn on, but my power tubes do not. I checked the fuses inside and the one on the frame. All those tested good by multimeter. Thank you.

Great video. Very informative

Great dudes, very helpful, my amps like new again, that marshall tone

Thank you for this video and information. Have a ET Pro One to dial my amps in when changing tubes.

EUROTUBESINCE, How do you bias the power tubes compression point when the tubes start compressing? you mostly use bias current at 30mA per power tube but how do you when the tubes are compressing?

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Plug the tube, do not rape it :) Treat her smoothly and slow around an think of a lovers night. But the vid is a real nice and good job. And thanks for the inspiration with that workframe - must be very helpful.