Somehow today RUclips decided to offer me many how I build my amplifier videos. Your video is actually what average Joe gets when building such project. You are down to earth, admit your challenges and solve the issues. Things happen when you are not professional. I actually admire your attitude. The main thing is you made it and it works properly and you have learned things. To be honest there are so many people making videos telling complete nonsense and explaining how things work but they actually do not know it at all but they keep on insisting that they are professionals. Sad time where there are no negative counter and someone who is professional gets dismissed by such content creators by saying that the professional is wrong with no proof what so ever. You haven’t done anything really bad or wrong. If you have built 10 of those you would become better. Your wiring would become neat. Your soldering skills would get better. You would get zapped once or twice but that would learn you to work with the left hand in the pocket when the amplifier is on. You would get at least one more multimeter and better probes. Some crocodile clams so you do not need to have your hands busy. Do not feel bad about anything. Same about playing. You do not live from it and you do not claim that you are professional musician. Play for your self and with the time you will get better. For your level in amp building and playing you did good job. Plus you haven’t tried to sell your self for something you are not. So you have earned my respect.
Thank you so much for your encouraging comment! I really appreciate your kind words and support. I started this channel to share my experiences and learn along the way, and it’s amazing to hear that my approach resonates with you. I believe in being genuine and honest about the challenges I face, and it's great to know that this attitude is appreciated. Each project teaches me something new, and I’m constantly learning and improving. Your advice is valuable, and I’ll definitely keep it in mind for future builds. I’m glad to have earned your respect, and I’ll continue to share my journey with the same honesty and openness. Thanks again for your encouragement and for watching my videos. It means a lot!
@DIY_AudioGarage You deserved it. Keep enjoying what you do. If you need to learn about tube amplifiers, I strongly advise you to watch videos of Uncle Doug. He explains things really easily, and he knows why and how things work. I watched it all enjoying the way he explained stuff, even stuff that I already knew for ages.
Thank you so much!! I am palnning on the #36 mod with the extra gain stage in the near future. I am waiting for some componets to get here and I will get to work adding the mod.
About have me encouraged to try and build one....don't be so negative about your playing...we all play at our own level and learn.....I'm 53 and still learning
Thank you so much for your kind words and encouragement! Building these projects can be so rewarding, and I'm glad to hear you're considering it. You're absolutely right about playing, it's all about enjoying the journey and continuous learning!!!
Great build, the only thing I would've done differently is when you're soldering wires to any tag with an eyelet hole, you should always pass the wire through the hole, then solder it. Tack soldering to the surface of the tag will work ok, but if you have any solder joints where the solder hasn't flowed well, the wire can easily come off and if it's a critical wire (power, speaker out. etc) you could end up with a big problem.
Thank you for the feedback! I appreciate the tip. That makes a lot of sense and definitely sounds more secure. I'll make sure to incorporate that technique in future projects to ensure better solder joints, especially for critical connections. Thanks again for sharing your knowledge!
thanks so much for posting this and putting it together in real world scenarios.. The schematic from Mojo looks good.. but I was surprised they did not give you more of a order of assembly.. this would be helpful for those of us that dont do this for a living.. I am going to look into this kit for sure.. let us know when you get the head box.. very cool..Mojotone has great stuff all around for sure.. I hear the JMP 50 kit is fantastic as well.. but i love the JCM 800.. love to hear the gain pushed to 7.. power amp pushed to 6 and an SD-1 in front.. chug chug chug.. lol
Hey there! Thank you so much for your kind words and for watching the video! I'm really glad you found the real-world scenarios helpful. I agree, a more detailed order of assembly in the Mojotone schematic would definitely be beneficial for those who are new to this or don't do it professionally. It's a great suggestion, and maybe something Mojotone could consider for their future kits. I'm also excited about the head box and will definitely update you all once I get it. Stay tuned for that! Mojotone indeed has some fantastic stuff. The kit I built is the JMP 50 but I canged the circuit to match an 800. They are basically the same. About the JCM 800, pushing the gain to 7 and power amp to 6 with an SD-1 in front is a setup that's just begging for some serious play. That chug is something else, right? I'll make sure to feature that setting in a future video so you can hear it in all its glory! Thanks again for engaging and sharing your thoughts. It's always great to connect with fellow enthusiasts. Keep an eye out for more updates and feel free to share any more of your ideas or questions! Rock on! 🎸"
@@DIY_AudioGarage hey no problem.. I am going to get a Mojo kit.. I've only built pedals so far.. but I would love to give this a try.. safety first.. I think you did a great job with the wiring runs.. clean and orderly..what type of solder did you use and generally what kind of tip and temp on the iron
@@bjstein4242 I used cheap soldering iron, which I purchased from a hobbyist website called Hobbyking.com a long time ago. I maintained the iron's temperature at approximately 650°F. I was particularly careful about not overheating the capacitors during soldering, as excessive heat can potentially cause damage to them. Also, I found that Stewmac offers a comprehensive instruction manual. It's quite useful, especially if you're new to this kind of project. Although they don't sell this specific kit, their manual is a valuable resource. You can check it out here: www.stewmac.com/video-and-ideas/online-resources/learn-about-building-instruments-and-kits/81-brit-800-50w-amp-kit-instructions/
Those jumper wires go UNDER the board not on the component side. I usually roll my AX7s for AU7s. Still plenty of volume but cleaner top end and more headroom.
Thank you for your feedback. I followed the wiring diagram provided by MOJOTONE, and they illustrate placing the wires on top of the components. While you could route them underneath, it likely won't make a significant difference in functionality. Also, on their website, they have pictures of completed boards with the wires positioned over the top. Ultimately, when building it yourself, you can choose to run the wires over the top or underneath based on your preference, either approach should work without issues.
If you are measuring cathode current is not the same as anode current it will also include screen current which is 9.5ma, I have built the same amp and set the current for 49.3 ma including screen current and plate volts is 440 volts On line can be found a bias calculator for el34 just enter plate volts and tube type.
@itsonlyme9938 Thank you for your comment and information about biasing. I was not aware of the screen curent affecting the total current. Also, thanks for the tip about the online bias calculator for EL34 tubes. I have seen the Robinette website with a lot of great amp building information. robrobinette.com/Tube_Bias_Calculator.htm Tools like that are incredibly helpful for getting accurate measurements and ensuring the amp performs optimally. It's always great to have such resources at hand, especially for DIY amp builders who might be new to these concepts, like myself. As an amateur still learning the ropes, I really appreciate insights from more experienced builders. Appreciate you sharing your experience and knowledge - it's a huge part of what makes the DIY audio community so fantastic!
@@DIY_AudioGarage The Robinette bias calculator is the one I used. Glad the info cathode bias was helpful and I think it does give full output when its set to optimum bias.
Awesome job! Love the meticulous wire routing. When you did the initial voltage testing without tubes, do you need a load on it, or is that only needed when you have tubes installed? Also, how does it take pedals? Does an OD/Distortion pedal sound good with it? "I'm not a good guitar player". You're better than you think you are. 😁
Hi @tim_shipp, it's generally recommended to have some form of load connected to mimic the expected operating conditions. This helps ensure the power supply and other components are functioning correctly under load. However, it's not strictly necessary for initial testing if you're just verifying the power supply is outputting the correct voltages. During my initial power-up, my main concerns were making sure there were no incorrectly connected cables that could cause a fire hazard, as well as checking that the filament voltage and negative bias voltage were present to prevent the output tubes from being overdriven and red-plating. As for using pedals, I've tried out some overdrive pedals like a Klon clone and the SD-1, and this amp takes them like a champ!
Somehow today RUclips decided to offer me many how I build my amplifier videos. Your video is actually what average Joe gets when building such project. You are down to earth, admit your challenges and solve the issues. Things happen when you are not professional. I actually admire your attitude. The main thing is you made it and it works properly and you have learned things.
To be honest there are so many people making videos telling complete nonsense and explaining how things work but they actually do not know it at all but they keep on insisting that they are professionals. Sad time where there are no negative counter and someone who is professional gets dismissed by such content creators by saying that the professional is wrong with no proof what so ever.
You haven’t done anything really bad or wrong. If you have built 10 of those you would become better. Your wiring would become neat. Your soldering skills would get better. You would get zapped once or twice but that would learn you to work with the left hand in the pocket when the amplifier is on. You would get at least one more multimeter and better probes. Some crocodile clams so you do not need to have your hands busy.
Do not feel bad about anything. Same about playing. You do not live from it and you do not claim that you are professional musician. Play for your self and with the time you will get better. For your level in amp building and playing you did good job. Plus you haven’t tried to sell your self for something you are not. So you have earned my respect.
Thank you so much for your encouraging comment! I really appreciate your kind words and support.
I started this channel to share my experiences and learn along the way, and it’s amazing to hear that my approach resonates with you. I believe in being genuine and honest about the challenges I face, and it's great to know that this attitude is appreciated.
Each project teaches me something new, and I’m constantly learning and improving. Your advice is valuable, and I’ll definitely keep it in mind for future builds.
I’m glad to have earned your respect, and I’ll continue to share my journey with the same honesty and openness. Thanks again for your encouragement and for watching my videos. It means a lot!
@DIY_AudioGarage You deserved it. Keep enjoying what you do. If you need to learn about tube amplifiers, I strongly advise you to watch videos of Uncle Doug. He explains things really easily, and he knows why and how things work. I watched it all enjoying the way he explained stuff, even stuff that I already knew for ages.
Dude, you took it off stand-by and I saw smoke drifting up!
It was my cigarette.
Great job man !! That amp sounds really good. I can't wait until you do the mods !!
Thank you so much!! I am palnning on the #36 mod with the extra gain stage in the near future. I am waiting for some componets to get here and I will get to work adding the mod.
Dude, that amp sounds amazing !!
Thank you!!
Excellent video. I think I’m going to order the kit. I’ve been wanting to build an amp for quite some time, and yours sounds really good. 👍🏼👍🏼
Great Job!
Amp sounds great
About have me encouraged to try and build one....don't be so negative about your playing...we all play at our own level and learn.....I'm 53 and still learning
Thank you so much for your kind words and encouragement! Building these projects can be so rewarding, and I'm glad to hear you're considering it. You're absolutely right about playing, it's all about enjoying the journey and continuous learning!!!
@DIY_AudioGarage exactly...music is one of the greatest enjoyments in my life and gives me an escape from time to time for at least a little while...
Great build and the amp kicks ass .
Great build and sounds great!
Thank you!!
Good job, give yourself a pat on your back. Cheers
Thank you!
Great build, the only thing I would've done differently is when you're soldering wires to any tag with an eyelet hole, you should always pass the wire through the hole, then solder it. Tack soldering to the surface of the tag will work ok, but if you have any solder joints where the solder hasn't flowed well, the wire can easily come off and if it's a critical wire (power, speaker out. etc) you could end up with a big problem.
Thank you for the feedback! I appreciate the tip. That makes a lot of sense and definitely sounds more secure. I'll make sure to incorporate that technique in future projects to ensure better solder joints, especially for critical connections. Thanks again for sharing your knowledge!
thanks so much for posting this and putting it together in real world scenarios.. The schematic from Mojo looks good.. but I was surprised they did not give you more of a order of assembly.. this would be helpful for those of us that dont do this for a living.. I am going to look into this kit for sure.. let us know when you get the head box.. very cool..Mojotone has great stuff all around for sure.. I hear the JMP 50 kit is fantastic as well.. but i love the JCM 800.. love to hear the gain pushed to 7.. power amp pushed to 6 and an SD-1 in front.. chug chug chug.. lol
Hey there!
Thank you so much for your kind words and for watching the video! I'm really glad you found the real-world scenarios helpful. I agree, a more detailed order of assembly in the Mojotone schematic would definitely be beneficial for those who are new to this or don't do it professionally. It's a great suggestion, and maybe something Mojotone could consider for their future kits.
I'm also excited about the head box and will definitely update you all once I get it. Stay tuned for that! Mojotone indeed has some fantastic stuff. The kit I built is the JMP 50 but I canged the circuit to match an 800. They are basically the same.
About the JCM 800, pushing the gain to 7 and power amp to 6 with an SD-1 in front is a setup that's just begging for some serious play. That chug is something else, right? I'll make sure to feature that setting in a future video so you can hear it in all its glory!
Thanks again for engaging and sharing your thoughts. It's always great to connect with fellow enthusiasts. Keep an eye out for more updates and feel free to share any more of your ideas or questions!
Rock on! 🎸"
@@DIY_AudioGarage hey no problem.. I am going to get a Mojo kit.. I've only built pedals so far.. but I would love to give this a try.. safety first.. I think you did a great job with the wiring runs.. clean and orderly..what type of solder did you use and generally what kind of tip and temp on the iron
@@bjstein4242 I used cheap soldering iron, which I purchased from a hobbyist website called Hobbyking.com a long time ago. I maintained the iron's temperature at approximately 650°F. I was particularly careful about not overheating the capacitors during soldering, as excessive heat can potentially cause damage to them.
Also, I found that Stewmac offers a comprehensive instruction manual. It's quite useful, especially if you're new to this kind of project. Although they don't sell this specific kit, their manual is a valuable resource. You can check it out here:
www.stewmac.com/video-and-ideas/online-resources/learn-about-building-instruments-and-kits/81-brit-800-50w-amp-kit-instructions/
Those jumper wires go UNDER the board not on the component side. I usually roll my AX7s for AU7s. Still plenty of volume but cleaner top end and more headroom.
Thank you for your feedback. I followed the wiring diagram provided by MOJOTONE, and they illustrate placing the wires on top of the components. While you could route them underneath, it likely won't make a significant difference in functionality. Also, on their website, they have pictures of completed boards with the wires positioned over the top. Ultimately, when building it yourself, you can choose to run the wires over the top or underneath based on your preference, either approach should work without issues.
If you are measuring cathode current is not the same as anode current it will also include screen current which is 9.5ma, I have built the same amp and set the current for 49.3 ma including screen current and plate volts is 440 volts
On line can be found a bias calculator for el34 just enter plate volts and tube type.
@itsonlyme9938 Thank you for your comment and information about biasing. I was not aware of the screen curent affecting the total current.
Also, thanks for the tip about the online bias calculator for EL34 tubes. I have seen the Robinette website with a lot of great amp building information.
robrobinette.com/Tube_Bias_Calculator.htm
Tools like that are incredibly helpful for getting accurate measurements and ensuring the amp performs optimally. It's always great to have such resources at hand, especially for DIY amp builders who might be new to these concepts, like myself. As an amateur still learning the ropes, I really appreciate insights from more experienced builders.
Appreciate you sharing your experience and knowledge - it's a huge part of what makes the DIY audio community so fantastic!
@@DIY_AudioGarage The Robinette bias calculator is the one I used.
Glad the info cathode bias was helpful and I think it does give full output when its set to optimum bias.
Awesome job! Love the meticulous wire routing.
When you did the initial voltage testing without tubes, do you need a load on it, or is that only needed when you have tubes installed?
Also, how does it take pedals? Does an OD/Distortion pedal sound good with it?
"I'm not a good guitar player". You're better than you think you are. 😁
Hi @tim_shipp, it's generally recommended to have some form of load connected to mimic the expected operating conditions. This helps ensure the power supply and other components are functioning correctly under load. However, it's not strictly necessary for initial testing if you're just verifying the power supply is outputting the correct voltages. During my initial power-up, my main concerns were making sure there were no incorrectly connected cables that could cause a fire hazard, as well as checking that the filament voltage and negative bias voltage were present to prevent the output tubes from being overdriven and red-plating. As for using pedals, I've tried out some overdrive pedals like a Klon clone and the SD-1, and this amp takes them like a champ!
Amazing no leftover parts. 😂
Your hands were always too close to the fuse when you were biasing, thought you were gonna be zapped...
Thank you for watching! I got lucky this time, but I have definitely been zapped before and it’s not fun. 🤩
#20_NoPeace_ever_GreatAccomplish_CoolWayToGet_thetone_MyRegards_Love_UncleDoug_Psionic_theWebHasSewMuch_🇺🇸🇮🇱✝️
Thank s for watching!!