Hello!
I am new to this forum.
I am interested in building a very simple basic Stereo Tube amp for my first project with the following specs (open to suggestions);
-single ended (stereo)
-~50W total (25W/channel)
-6L6 power tubes?
-preamp tube undetermined
I saw a good read on a basic 6L6 SE application which matches what I want, but the preamp 6SJ7/6SD7 doesn't look too common, I would like to substitute for a more common preamp tube. The post is here:
DIY Single-Ended (SE) 6L6 / 5881 Tube Amplifier
Any suggestions? An alteration to the preamp in the schematic above to switch to a different preamp tube?
Thank you!
G.
I am new to this forum.
I am interested in building a very simple basic Stereo Tube amp for my first project with the following specs (open to suggestions);
-single ended (stereo)
-~50W total (25W/channel)
-6L6 power tubes?
-preamp tube undetermined
I saw a good read on a basic 6L6 SE application which matches what I want, but the preamp 6SJ7/6SD7 doesn't look too common, I would like to substitute for a more common preamp tube. The post is here:
DIY Single-Ended (SE) 6L6 / 5881 Tube Amplifier
Any suggestions? An alteration to the preamp in the schematic above to switch to a different preamp tube?
Thank you!
G.
Last edited:
You missed a decimal on the output power. This amp will be closer to 5 watts output. Other than that a fine amp.
You need big transmitter tubes and very high voltages for single ended 25W per channel. Not a first time project.
I just built a 100W guitar amp. It is running on 3 12ax7, ss rectification, and 4 EL34. I figure with ~25W/EL34, 25-30W/6L6 on a HiFi amp was doable?
That makes more sense.
You should do some studying of single ended amps. What you want is difficult and expensive, and can be dangerous. There's a reason push-pull amps are so popular. 🙂
For a first time single ended build, you'll end up at about 2-5 watts per channel. Nothing wrong with that.
You should do some studying of single ended amps. What you want is difficult and expensive, and can be dangerous. There's a reason push-pull amps are so popular. 🙂
For a first time single ended build, you'll end up at about 2-5 watts per channel. Nothing wrong with that.
Yes, for sure. That's doable with EL34, I think. Or KT88. Output transformers will be much more reasonable, too.
Not off the top of my head, but there should be plenty here. It could take some searching to find one. It's a pretty classic idea.
Ok thank you,
My only question is, should I use EL84 instead, since in a push pull 2//2 EL34 will yeild 100W, where 2//2 EL84 would yeild ~40W? I do not need over 50W
My only question is, should I use EL84 instead, since in a push pull 2//2 EL34 will yeild 100W, where 2//2 EL84 would yeild ~40W? I do not need over 50W
Thanks. I dont need over 50W, should i look into EL84 since with push pull;
2//2 EL34 = ~100W
2//2 EL84 = ~36W
Have you ever heard the old saying: "From 3 conditions: fast, best quality, low cost, IN REAL LIFE you can have only 2 altogether" ?
You wanna Hi-Fi and inexpensive? Get ready for a 2-3+ year long project.
Oh, you wanna fast and cheap? That would be just another guitar combo coming out.
Since you have EL34s on hands, better go for 2 in parallel, and you maybe, maybe get like 10 WPC of the good sound.
SE not surely means Hi-Fi. I heard plenty of crappy SEs, and many good sounding PPs. It depends a lot on you understand what you r doing.
EL34 SE amplifier - Google Search
Here you go, 35WPC:
An externally hosted image should be here but it was not working when we last tested it.
Thank you Shef, that's 4 output tubes per channel? So in total (I would use SS rectifier) it would be 2 FETs, and 12 tubes?
Thank you Kenneth, but that is a $100 tube (website says 70W dissipation? What a beast) I'm a little confused here.
Keeping it simple, a Mono single ended EL34 or 6L6 should yield a ~25-30W output shouldn't it? Or is there a loss with single ended VS Push Pull?
I remember a guitar amp I used to have that was an EL34 single ended, and it was 5W, so maybe that makes sense?
With SE an EL34 will output 5W
And PP an EL34 will output 25W
(more or less) Correct?
SE 25WpC...
Here is a bench-tested idea for 40 Watts SE.
Two KT120 ($108) plus a 1628SEA ($140) and a 370LX ($170).
Double that for stereo.
(A previous plan with one HK257 tube was abandoned as too awkward and dangerous.)
Push-pull needs one more driver tube but the output transformer may be half the size (cost), and the power iron may be significantly cheaper.
Start with transformers you can GET affordably. This probably means "popular replacement" parts. The Dyna ST-70 (two 35W) comes to mind; bias can be adapted to work with 6L6 if you wish. A wilder idea is two OTs from Fender 40 Watt (they will loaf at 25W) and PT from a Fender 100W Twin.... guitar-amp fixers seek low prices for quality iron so may be a buck cheaper than Hi-Fi iron.
Here is a bench-tested idea for 40 Watts SE.
Two KT120 ($108) plus a 1628SEA ($140) and a 370LX ($170).
Double that for stereo.
(A previous plan with one HK257 tube was abandoned as too awkward and dangerous.)
Push-pull needs one more driver tube but the output transformer may be half the size (cost), and the power iron may be significantly cheaper.
Start with transformers you can GET affordably. This probably means "popular replacement" parts. The Dyna ST-70 (two 35W) comes to mind; bias can be adapted to work with 6L6 if you wish. A wilder idea is two OTs from Fender 40 Watt (they will loaf at 25W) and PT from a Fender 100W Twin.... guitar-amp fixers seek low prices for quality iron so may be a buck cheaper than Hi-Fi iron.
- Status
- Not open for further replies.