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Old 6th January 2012, 10:14 PM   #1
tipetu is offline tipetu  Norway
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Default What amp to build? Push Pull, SE? thoughts?

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...)
Click the image to open in full size.

Anyone got a simple schem?
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Old 6th January 2012, 10:40 PM   #2
DF96 is offline DF96  England
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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?
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Old 6th January 2012, 11:03 PM   #3
tipetu is offline tipetu  Norway
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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?
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Old 6th January 2012, 11:08 PM   #4
tipetu is offline tipetu  Norway
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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
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Old 7th January 2012, 12:29 AM   #5
Cassiel is offline Cassiel  Libya
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Quote:
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.
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Old 7th January 2012, 12:37 AM   #6
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Those who like SE know music and what it is supposed to sound like, those who like PP only care about loud and they obviously don't know music.

Build SE. It is what you want.

Whatever.
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Old 7th January 2012, 12:44 AM   #7
Cassiel is offline Cassiel  Libya
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Yeah, I was expecting strong emotions. Guess you'll have to find it out for yourself.
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Old 7th January 2012, 12:46 AM   #8
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Ha! You knew that was going to happen. The twain shall never agree.
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Old 7th January 2012, 12:56 AM   #9
a.wayne is offline a.wayne  United States
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Why stop now guys ..

What about an class-a SS SE amplifier, for those who love reliability, music, can hear and understand the good things in life ...


If not .... I vote SE .....
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Old 7th January 2012, 01:00 AM   #10
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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
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