Hi there! I have a transformer, 300V with centertap, some ok OT, two EL84, and 2 12AX7`s.
Not sure what kind of amp I want to build!
Push pull?, SE? I`m leaning towards Single Ended because it seems simplest.. I think..
Something like this. (paint yeah...)
Anyone got a simple schem?
Not sure what kind of amp I want to build!
Push pull?, SE? I`m leaning towards Single Ended because it seems simplest.. I think..
Something like this. (paint yeah...)
An externally hosted image should be here but it was not working when we last tested it.
Anyone got a simple schem?
SE has a simpler circuit, but may need a better power supply as it can't take advantage of a PP output to reduce hum. To some extent SE vs PP is a matter of taste, so only you can judge that. Other things are room size, speaker sensitivity, type of music, how loud you like it etc. Also, how much experience do you have at building electronics, and particularly mains powered valve electronics?
Hi, I`ve been tweaking and building a handfull tube amps for some years now, but never actually designed one from scratch. Only kits and stuff. I`m an electrical engineer (high voltage) and are familiar with basic electronic theory and ofcourse dangers. I`ve found some basic setups regarding various resistors, plate, grid, and cathode on the el84 and 12AX7. Only thing I`m not sure of is wether it`s critical to match the impedance between the preamp stage and output stage?
My First Tube Amplifier
This guy here explained tube theory very good! This is the preamp stage I`m going for. Then I`ll send the signal through a EL84
This guy here explained tube theory very good! This is the preamp stage I`m going for. Then I`ll send the signal through a EL84
To some extent SE vs PP is a matter of taste,
No, those who have taste like SE those who like music go for PP.
Whatever.
If the OP only has two EL84, as stated, here is a link that may help as a starting point.
http://wireless.ee.washington.edu/indep_study/ben.pdf
http://wireless.ee.washington.edu/indep_study/ben.pdf
Here is another candidate:
http://i263.photobucket.com/albums/ii151/cameramanlink/6BQ5StereoAmp.gif
From this site:
Electronics Projects - Vacuum-State Electronics
http://i263.photobucket.com/albums/ii151/cameramanlink/6BQ5StereoAmp.gif
From this site:
Electronics Projects - Vacuum-State Electronics
I'm leaning towards Wavebourn's response... look at what OPTs you have or what you're willing to spend on a pair. That will dictate your amp overall... and you should consider the output tube and stage topology at the same time.
Oddly, 45 triodes are a bit less expensive these days... for a couple watts, it's difficult to think you could possibly do better. And at the same time, consider what you are going to be driving as a speaker... that also influences what you would or could be happy with.
Regards, KM
Oddly, 45 triodes are a bit less expensive these days... for a couple watts, it's difficult to think you could possibly do better. And at the same time, consider what you are going to be driving as a speaker... that also influences what you would or could be happy with.
Regards, KM
Oddly, 45 triodes are a bit less expensive these days... for a couple watts, it's difficult to think you could possibly do better.
4P1L
4P1L
I can't argue with you on this one... I just don't have any of them (4P1L) to play with. I do have an extensive collection of 45 triodes... so I will sign up for being well versed on the 45. What differences do you perceive between the 45 and 4P1L?
Regards, KM
No offense, but you all just go off on your own tangents all the time, don't you.
OP has EL84, 12AX7.
No mention of 12AT7, 45s, 4P1L, blah, blah, blah.
Please stick to the subject at hand.
http://i263.photobucket.com/albums/i...5StereoAmp.gif
OP has EL84, 12AX7.
No mention of 12AT7, 45s, 4P1L, blah, blah, blah.
Please stick to the subject at hand.
http://i263.photobucket.com/albums/i...5StereoAmp.gif
Bad link. Here is the correct one:
http://i263.photobucket.com/albums/ii151/cameramanlink/6BQ5StereoAmp.gif
http://i263.photobucket.com/albums/ii151/cameramanlink/6BQ5StereoAmp.gif
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