Видео

This is really helpful, thanks for making this!

Howdy. My suggestions. 1. Parasitic oscillations. Check the EL84's grid stopper resistor. If there are none, inserting grid stopper resistors is highly recommended, Try values between 1k to 8k6. 2. Check biasing (mentioned below). 3. Leaking EL84 grid capacitor. Solder disconnect one lead and check the resistance with a multimeter. I have had two cases brand new cap.s leaking. Flippin' difficult to diagnose. Eventually I checked DC voltage levels around the end tube and observed the grid voltage being way off. Regards.

Tube amp tech here.......... I know this is a vintage video... BUT... notice how there's a purple color in the tube on the left??? It leaked air, and lacks enough vacuum to function correctly. Not going to bash EH tubes... it can happen to any of them. Sometimes there are quality issues, but overall they've been OK in my experience, IF they are run within their operating parameters.

Check screen grid resistors. Then check/set bias. If still red plating one, get a new set of tubes and bias them properly.

I just got a 1951 tube tv and I don't know how to fix it. Any suggestions?

Fucking talk

What happens if the double action truss rod happens to be stripped? Can it be repaired?

I echo what others have said - great simple, thorough little video. Thanks. I've pointed people asking me questions about the difference to your video; much easier than me trying to explain it in words in a RUclips comment.

Just remember that if you replace your tubes, the amp needs rebiased unless its a Mesa with Mesa tubes.

Thankyou SO MUCH!!! I have a Jackson JS22-7 with back-bow on the neck, and have the truss rod fully loosened and it still hase back-bow. I didn't know it has a dual-action truss rod! I will be trying this out today after work to see if I can fix the back-bow. I am so excited! It is a restoration project guitar. Everything else about it is great - just the back-bow that is annoying! Thankyou again for your video mate. Have an awesome AWESOME weekend!

Oh, ok i got it! Thanks a lot for this video.

Too much plate current into tube, you can damage the output transformer and then you'll be in much bigger trouble than just replace a failed tube

I’m surprised it doesn’t pop the fingerboard off the neck…never thought of that before…excellent video 👍

An amazing bit of guitar wisdom and truth done to perfection, hats off to you!

Thank you.

It seems over plate current, may be the resistors of the grid have prpblem. Any way, the tube cannot be used any more, as the plate burnt red hot, sound quality will be much deteriorated.

I finally saw everything about the tensioner rod. it became very helpful. cool 👍🙂

My amp is a fender rumble 15. It made a pop noise and stop working, and it also started smelling weird. Please help I have no clue what’s happening

Brilliant! Very informative! Thanks! 🎸🎶😃

Does anyone know which model Ltd Ec is?

Сравнение радиоламп 6П14П ЕВ, 6П15П, 6П43П Е, EL84 TESLA, EL84 TELAM ruclips.net/video/XV4MEBqWqPI/видео.html

Возможно, там не контачил 2-й штырь - 1-я сетка, поэтому не было смещения. Perhaps the 2nd pin did not connect there - the 1st grid, so there was no bias.

Can I get your email ?

Thanks for a superb video! My arch top is a single truss rod and I always wondered what the difference was. So for low action I gues I need to tighten (clockwise) the single truss rod a bit.

Grate!

Thanks for the excellent content.

In 2022 this is still the best video for understanding how truss rods work. Thank you!

The problem isn't the tube, it's what's feeding it!!

Thanks so much for making and sharing this video! I got some (also Electro-Harmonix) EL86 for mine and that buzzing started right away after they were swapped in. I hated that buzz AND the amp broke up so much sooner! Great, that was some 40-odd dollars down the drain but at least there is hope!

Looks cool at least 😂

Don't run an amp when output tubes are red-plating, you could burn up your output transformer

My first guess would be the bias isn't set right, that will cause it to draw too much current and red plate. My second guess would be something is shorting out causing the tube to draw too much current. These are just guesses though I hope it helps

omg, best video, old school of youtube

Great video thank you!

What a great video.. simple and to the point with excellent presentation. Thank you.

The music is somewhat distracting (feels like a X-Files weird vibe) but good video anyways...

A revelation!! I'll still be too gutless to attempt adjusting my own! Thank you.

I had that issue today, with my 6v6 power tubes in my 1 yr old Princeton. 1 was as bright as a orange and a soft burning smell started. I noticed the issue cause my sound kinda halved. I wiggled and reseated all the tubes and it went back to normal. I don’t feel it’s the end of i, so just holding my breath.

This is what im seaching... Thanks

Thank you.

Hi, can u tell me what kind of truss rod is inside the Gibson Hummingbird?

I'm guessing the rod in my Squier jbass is a two way seeing as how it doesn't come out when you loosen it to the max. Kind of sucks because I can't tighten it beyond its limit when I need to in order for the neck to be straight again (it's warped like a banana, concave). I could be facing more than just truss rod issues since the action is also uneven and the warp is only from about the fifth fret to the first. This wasn't the case until about a month after some freezing temperatures took over a week in Feburary. Basically since the first day of spring I have been dealing with a dead sound compared to the brightness it once had when it was new. Even after getting lighter gauge strings, having it setup by guitar techs, and meddling with the saddle heights it still looks and plays blandly. The technicians basically solved half the problem, although I have yet to adjust the truss rod to be certain of that. After all, I did tell them what happened and waited two weeks for results 🤷‍♂️ but it sounds about as good as it once did just bent like a skateboard ramp.

That is one heck of a good demonstration ! Thanks ! :)

@1:06 Yeah, that is what we called tube "cherrification" back in the day. That sucker's ready to pop! EH tubes are known for that. Good ol' Sovteks or JJ's here would be a better choice. Still I'm surprised the EH tubes lasted 2 years of daily use.

Great video, very easy to follow! Thank you

Perfect visual for understanding truss rods. Exactly what I needed👍🤘

Jean you are the best where are you Salut from Germany

Since a double action rod has two thread, is it normal for it to be harder to turn then a single action?

the moment my last set of ehx power tubes bit the dust, i heard the disembodied voice of an angry man shout “cyka blyat” at me through the speaker. this is why i only use NOS american tubes now.

I have the same brand...h?.