Hello David, thank you. That means a lot from someone who has played with some of the best musicians in the world I watched one of your videos from the late 70s. Your playing was mind blowing. The guy on the Banjo was amazing too. Take care David.
A word of caution to prospective buyers: if you see any amplifier like this with stacked horizontal rows of knobs, internally it will have stacked horizontal PCB boards and it'll be almost impossible to clean the pots on the bottom without major disassembly. A broken solder connection to one of those pots will cost you major labor time just to get to the underside of the board and resolder a few things. And that's before you get to the cost of replacing bad capacitors...... It's a bad design concept and no one should support it by buying things that are built like this.
Nice video again. Glad to see a wide variety of amps in your hands. BTW it would be interesting to know how much higher the temperature inside the chassis (where those poor electrolytic caps must live and struggle in) is compared to a 100W Marshall head which has tubes pointing upwards. For example if the working temparature of an el. cap gets 30°C higher from around 30-40°C temperature, the life expectancy of the cap (of course depending of the quality and temperature rating of the cap) usually will be drastically shorter. And if the cap has ripple currents, ESR + ripple current will create some heat inside the cap. ESR usually gets higher when that cap ages, and the result especially in high temperature eventually is a death spiral of that cap. I have used one 100W head with same set F+T main caps for 29 years, and I just recently measured those caps which have run almost in room temperature in that chassis because all the heat from tubes and transformers goes up in the air, and the caps were like new. They will last longer than I'm gonna last.
Hello, thank you. That's a good point. The heat certainly shortens the life of caps. This amp must be nearly twenty years old. The caps have not done bad in this one. It may not have been gigged and only used for half an hour every few days. It's a hard one to answer. hanks for watching and take care.
Hello Andrew. Not much to tell really I spent about 15 years working under an old school tech. I had a break from it for a few years. Then started up again in 2018. The old tech is still with us. He is retired and in his 80s now. I miss all the fun we had. Take care.
First time I am ever seeing this amp. Any in the US? The footswitch must be a monster with all the switching. When you showed the guts my first thought was Mesa Boogie. Amp makers, don't do what Mesa does?
Hello. I don't know if they were ever imported to US. You don't even see many over here. I don't think they made many of them. You need to Roadies to carry the foot switch. Take care.
![The Best Guitar Amp In The World [And Tips On Using Pedals With It]](/img/n.gif)
Bit o' country, blues, metal with shredding, tapping.
Man of many talents 👍
Hello, thank you. Take care.
Not normally a Marshall man but this one sounds great! That speaker helps I'm sure. Wish my playing was that 'rubbishy' ! : )
Hello Pete, thank you. Take care.
You are one heck of a good amp tech, but you are an even better guitarist. I love hearing you play at the end your videos.
Hello David, thank you. That means a lot from someone who has played with some of the best musicians in the world I watched one of your videos from the late 70s. Your playing was mind blowing. The guy on the Banjo was amazing too. Take care David.
@ That was my older brother playing the banjo.
A word of caution to prospective buyers: if you see any amplifier like this with stacked horizontal rows of knobs, internally it will have stacked horizontal PCB boards and it'll be almost impossible to clean the pots on the bottom without major disassembly. A broken solder connection to one of those pots will cost you major labor time just to get to the underside of the board and resolder a few things. And that's before you get to the cost of replacing bad capacitors...... It's a bad design concept and no one should support it by buying things that are built like this.
Hello. Yes a nightmare if any of those boards need some work. Labour costs are high on these types of amps. Take care
Very Interesting . Thanks for the Video . New Subscriber from Australia.
Hello Andrew, thank you. Welcome to the channel. Take care.
Great repair Martyn. Amp sounds really very nice, but I'd need to be a lot fitter and stronger than a lumberjack to lift it around.
Hello Pete. Yes, I am not a lumber jack either. I did manage to get it on the bench though. Take care Pete.
Nice video again. Glad to see a wide variety of amps in your hands.
BTW it would be interesting to know how much higher the temperature inside the chassis (where those poor electrolytic caps must live and struggle in) is compared to a 100W Marshall head which has tubes pointing upwards. For example if the working temparature of an el. cap gets 30°C higher from around 30-40°C temperature, the life expectancy of the cap (of course depending of the quality and temperature rating of the cap) usually will be drastically shorter. And if the cap has ripple currents, ESR + ripple current will create some heat inside the cap. ESR usually gets higher when that cap ages, and the result especially in high temperature eventually is a death spiral of that cap.
I have used one 100W head with same set F+T main caps for 29 years, and I just recently measured those caps which have run almost in room temperature in that chassis because all the heat from tubes and transformers goes up in the air, and the caps were like new. They will last longer than I'm gonna last.
I think it's time to stop building combo amps and build heads instead. Downward-pointing tubes should be a thing of the past.
@@goodun2974 And in addition to that heat problem there is that problem of microphonic tubes near that loud as h*ll and vibrating speaker.
Hello, thank you. That's a good point. The heat certainly shortens the life of caps. This amp must be nearly twenty years old. The caps have not done bad in this one. It may not have been gigged and only used for half an hour every few days. It's a hard one to answer. hanks for watching and take care.
Cracking shredding!
Hello, thank you. Take care.
Great Channel . Can you do a video on your Tech history eg . Did you do a trade Certificate ect. Keep up the great work thanks . 🙏
Hello Andrew. Not much to tell really I spent about 15 years working under an old school tech. I had a break from it for a few years. Then started up again in 2018. The old tech is still with us. He is retired and in his 80s now. I miss all the fun we had. Take care.
I used to have a head version of that amp,in fact I traded it to Dougs cabin,you were there at the time I remember.Far too much things on them for me.
Hello Brian. You have a great memory. I can't remember that. Speak soon mate.
Thanks for the video.
Hello Paul, thank you. Take care.
First time I am ever seeing this amp. Any in the US?
The footswitch must be a monster with all the switching.
When you showed the guts my first thought was Mesa Boogie. Amp makers, don't do what Mesa does?
Hello. I don't know if they were ever imported to US. You don't even see many over here. I don't think they made many of them. You need to Roadies to carry the foot switch. Take care.
Someone gave me the ot from one nof these and a jcm900 100w pt. Should be an interesting build. God knows where I'll be able to turn it up lol
Hello. You can't beat a free OT transformer. Let me know how the build goes. Take care.
Never mind the amp, what a picker!
Hello, thank you. Take care.