That 'switching around' was so seamless I had to replay it a few times! Very well done!

@bgdwiepp

10 жыл бұрын

agreed! i was thinking "what just happened... ooohh!"

Yet another great video.i used to work with a bass player / Amp repairer who without any problem would pull off the back & tinker with the amp while it was being played ! Still to this day seems mind blowing. Was definitely a sight to behold :)

Great vid, reminds me of when I started tinkering with electronics in 1970,s as a kid..my mums radiogram with valves gave me a shock.. That's when I learned to respect electricity and valve amplifiers.. But I'm still alive and now an electrician/technician.. Be safe kids! Always check for voltages with a meter..you may not be so lucky!..

Very interesting video. Reminds me of the amplifier in the Hammond H100 I used to own among many other organs over the years.

sweet, valve amp! I don't know what I love about valve amps, but I love them :) I once read a theory that some people think rusty output transformers sound better.

Great video Markus.

lols... I used to own this exact amp, back in the day (80's metal days that is) I was never really happy with the sound. I ended up running a Mesa Boogie preamp into it and just utilizing the raw output power to 2 4x12 cabs. I agree with Markus... it was bloody heavy to lug around! :-)

Very informative videos and well produced. I will be looking at your site again, thank you. Lionel

@markusfuller

9 жыл бұрын

Thankyou Lionel. I'm actually learning new things as I go along myself. Best wishes

Thank you mark for the Quick reply☺ Hopefly a 106 will be fixed by you soon😆

Nice job in deduction the problem; like you when I see a missing fuse, especially with the cap gone I assume there is a problem and check internal parts to make sure there are no shorts and progress from that point on until I'am satisfied everything is working properly.

I would make a comment on the wave I saw on your scope. It seems to me the el34 is out of bias. Mostly there are cathode resistors od 1 or 10 ohms. First they work as fuses for your ugt I bet if you measure the voltage drop on them you see the currents isn't even. Unbalanced bias. I'm not scared of those tubeamps 😉 just what you said keep in mind. First measure befor touching. 😂

love your videos, they're incredibly informative and super fun to watch! I've got a question that i hope someone can answer. Not that i intend to do any repair on anything, as i'm not experienced enough to try, but for anyone that would like to; what shouldn't you touch? what are the dangerous areas, and how might someone unintentionally hurt themselves by touching the wrong things. I mean, what, specifically, shouldn't be poked, prodded, or touched. thanks!

@markusfuller

10 жыл бұрын

Hello Nan. I would not touch any circuitry with my fingers if it was connected to the mains. because these have large Capacitors (the 6 large blue tubular devices on this Amplifier). they will hold an electrical charge for a while even after it has been disconnected from the mains. I waited for a little while (15 mins) then tested for voltage before I proceeded with the video. Not everything holds a dangerous charge when unplugged but I am especially careful with Valve amplifiers or anything that has these large capacitors. Ps Capacitors can be many different colours not just Blue. Best wishes from Markus

@silasfatchett5693

8 жыл бұрын

+Nan Rozark Not trying to be clever, but the simple answer is 'if you don't KNOW what you shouldn't touch, DON'T TOUCH ANYTHING!'

Thanks Markus - fun and informative as always! I was worried with the danger warnings and then saw your tee-shirt... Game Over! Glad you made it thru ok! :-)

Markus, is there much value in using an isolating transformer when working with valve kit ?

Can’t believe he ran up a valve amp with no load on the output that’s the best way to kill the output transformer

Great stuff Markus - love your channel. I always thought that valves were like car headlight bulbs in that you shouldn't handle them bare-handed as the oils from your hands can cause uneven/over heating and shorten their lifespan. Maybe it's just an old wives' tale?

@markusfuller

8 жыл бұрын

+Mark Foxwell Hi Mark. to be honest I just make sure my hands are very clean before playing around with valves. I have heard many things like the glass will become fragile where the human oils have leached into the glass (that sounds like an old wives tale to me). I have even heard that speaker wires are directional (LOL) . I am just not really sure and can honestly say nothing has ever broken down because I have touched the glass or sounded wrong because i got the speaker wire in the wrong direction.

Hi mark... Very nice podcast, i like your channel😊 I was wandering if you can do a juno 106 fix or a terdoun, Explorering that wanderful pice

@markusfuller

10 жыл бұрын

Hi. I have seen a second hand Juno 106 in my local music shop but it is far too expensive for me to buy £999.00 If I manage to get my hands on one then I will certainly do a teardown, I owned one many years ago but sold it. I wish I still had it as it was a very good sounding synthesiser.

Markus, How long in years can an analog component last??

Even though I didnt understand any of this ,it was very interesting,all I wanna do is play my guitar.

hi mark.. how long you worked in this job..before this, have you worked in other company like a big electricity companies..?

@markusfuller

8 жыл бұрын

+Alju Kimong Hello Alju, I was into electronics when I was about 6 or 7 years old, I worked in london as a sound & lighting engineer but was always fixing synths & other gear for some of the bands, I passed my electronics courses and music technology at college years ago but certificates does not mean a thing. I still get stumped every day as electronics is a forever evolving entity and you just have to keep on trying all the time. I think I have learned most by just taking things apart and trying to work out how things work though i'm not always 100% right. I do make mistakes and cannot repair everything but the challenge is the best part. I'm just very inquisitive and want to know how everything works. Best wishes from Markus.

@aljukimong

8 жыл бұрын

You're right "certificates does not mean a thing." experiences make us skilled and not the theory .. good luck to you ..

You did a mask for the switching round part right? :) Wish I had a buddy like you to fix my broken shit haha sitting on two nice valve amps and a few pedals and can't find a decent tech anywhere near me

@markusfuller

8 жыл бұрын

+Pauly Mack Guitar Hi Pauly Yes I did a mask but placing the amp in just the right place was real tricky.

@Pauly421

8 жыл бұрын

markusfuller Ah yes, well it was very nicely done, had me scratching my head lol

Could you make some more valve amp repair videos please?

@markusfuller

8 жыл бұрын

+John Simms Hi John. if I get some more Valve amps I will certainly make another video.

6CA7 and EL34 same tube

Boosts me pace maker no end....Wife lights up like a fruit machine..

No vids for a while, hope your OK.

@markusfuller

9 жыл бұрын

Hi Neil. sorry been busy for a while but I just uploaded a new one. best wishes from markus

I believe you need to leave it plugged in and off for a few min to give a path to ground for the discharge resistors on the caps.

How the fuck did you switch round like that but you stayed the same.

Thanks for this. Btw, you can get caps for the knobs at Mouser:www.mouser.com/ProductDetail/Eagle-Plastic-Devices/450-CP196/?qs=LMMkZCEv/f3r11ehLSCgpQ==

EL PREDECESOR DE ESTE APMLIFICADOR www.laney.co.uk/products/product_details/62

aren't there any Americans that know this stuff?

@kcrmson

8 жыл бұрын

+russell hess Check out the Uncle Doug channel, he definitely knows about tube/valve amps, has tons of great videos.

So, you didn't replace the burnt resistor. You didn't test the damaged diode. Did not check the bias. You bothered to check it on your oscilloscope, yet ignored the fact that the amp was distorting badly and had terrible crossover distortion. And you put this on a recording so we could watch? Your "service" was less than useful, and not informative in any way. I guess the words repair and service mean something completely different from what I thought they meant.

@markusfuller

4 жыл бұрын

Hellp Paul, I’m sorry you did not like this video. And I agree you do make some valid points. These were some of my early videos when I was just starting the channel. Some of the components have been changed since making this video and the amplifier is still in use today. If you are looking for well informed video’s and greater depth of technical detail may I suggest an excellent youtuber that I am subscribed to called Mr Carlsons Lab. best wishes - stay safe :-)