Hello everyone!
This is my first post! 😀
Im about to start my final project for my university. After a long discussion we (me with a professor) conclude for me to build a guitar amp. I wanted to buy one but as I could combine my project with my hobby (guitar playing) I decided to build one! I was looking for all tube amps but the cost for me was too high, so I conclude on making a ss amp with tube preamp!
I came to be between 2 amps.. The Marshall Valvestate 8080 and the Laney tube fusion 200.. Which one of these two do you recommend for me to work on?
Is anyone that owns one? I have schematics from both! But I have some questions about their power transformers.. I have to build them by my own.. So I need to know their exact features.. No of the schematics i have writes their specifications.
Thanks anyway! 🙂
This is my first post! 😀
Im about to start my final project for my university. After a long discussion we (me with a professor) conclude for me to build a guitar amp. I wanted to buy one but as I could combine my project with my hobby (guitar playing) I decided to build one! I was looking for all tube amps but the cost for me was too high, so I conclude on making a ss amp with tube preamp!
I came to be between 2 amps.. The Marshall Valvestate 8080 and the Laney tube fusion 200.. Which one of these two do you recommend for me to work on?
Is anyone that owns one? I have schematics from both! But I have some questions about their power transformers.. I have to build them by my own.. So I need to know their exact features.. No of the schematics i have writes their specifications.
Thanks anyway! 🙂
Dont know about Laney Fusion, but I would call Valvestate hybrid. It is all SS amp with just one valve in preamp. For me hybrid would be all tube preamp driving SS output stage (preferably mosfet). You need soft clipping SS output stage. Just search the forum, there are some threads about hybrid guitar amps.
You could also build seperate tube preamp and seperate SS poweramp. Later you can build tube poweramp if you want.
You could also build seperate tube preamp and seperate SS poweramp. Later you can build tube poweramp if you want.
🙂 Yes I know how those amps are! Laney is the same too! Hybrid as you call it! I conclude in those two because i found a lot of information to the internet.. The only problem is that i wasnt able to find their transformers exact specifications!
The solution of this problem will show me with which one im going to work!
If someone help me with that, i will let you know how the project is going!! 🙂
The solution of this problem will show me with which one im going to work!
If someone help me with that, i will let you know how the project is going!! 🙂
It is your project. May I assume it is for an electronics course?
Exact specs don;t matter. Decide the power you need to be at the output, then cast the power supply to fill that need. The Marshall amp power amp stage could run anywhere from +/-25v to maybe +/-40v. And the transformer need enough current to supply the output voltage into the speaker load you chose.
The preamp is full of op amps, which won't draw much current. SO the transformer need to provide an amp or less at something like 30-36vAC center tapped. Then that will be rectified, filtered and regulatede down to +/-15vDC.
I don;t know the Laney, but the Marshall is not a tube preamp, it is a solid state preamp with a tube stuck in it. That tube requires some high voltage and some heater supply. The Marshall uses an auto-transformer to make the high voltage. You could just as easily add a small current high voltage winding to your power transformner. But really, why add the trouble? Just go with a all solid state preamp. Look at something like a Peavey Bandit as an example.
Exact specs don;t matter. Decide the power you need to be at the output, then cast the power supply to fill that need. The Marshall amp power amp stage could run anywhere from +/-25v to maybe +/-40v. And the transformer need enough current to supply the output voltage into the speaker load you chose.
The preamp is full of op amps, which won't draw much current. SO the transformer need to provide an amp or less at something like 30-36vAC center tapped. Then that will be rectified, filtered and regulatede down to +/-15vDC.
I don;t know the Laney, but the Marshall is not a tube preamp, it is a solid state preamp with a tube stuck in it. That tube requires some high voltage and some heater supply. The Marshall uses an auto-transformer to make the high voltage. You could just as easily add a small current high voltage winding to your power transformner. But really, why add the trouble? Just go with a all solid state preamp. Look at something like a Peavey Bandit as an example.
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An all-tube guitar amplifier doesn't have to be expensive. You can get pretty much all the parts you need from eBay.
Think of it like this. You are going to spend many hours learning about this amp, designing it, building it and testing it. You will write up a report and it will become part of your University course. Many years from now you will be able to use this amplifier and feel really good about it. A tube amplifier can be rugged and if you use commonly available tubes it will be easy to maintain it for the rest of your life even if you get a 'better' one later.
AX84.com - The Cooperative Tube Guitar Amp Project
Think of it like this. You are going to spend many hours learning about this amp, designing it, building it and testing it. You will write up a report and it will become part of your University course. Many years from now you will be able to use this amplifier and feel really good about it. A tube amplifier can be rugged and if you use commonly available tubes it will be easy to maintain it for the rest of your life even if you get a 'better' one later.
AX84.com - The Cooperative Tube Guitar Amp Project
I have designed a couple of hybrid amps.
One was an SRPP valve front end with a MOSFET output stage.
The other was an SRPP fromt end with a class d output stage.
Both sounded very sharp and clean.
In both cases the ss stage ran off +/-45 volts so I used this as 90volts across the tube.
One was an SRPP valve front end with a MOSFET output stage.
The other was an SRPP fromt end with a class d output stage.
Both sounded very sharp and clean.
In both cases the ss stage ran off +/-45 volts so I used this as 90volts across the tube.
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