I have a bunch of 6AS7G I thinking of building with in the future.
But I wonder do they sound best I SE or P-P?
Nevermind the outputpower just the sound Quality.
Schemas are welcome..
But I wonder do they sound best I SE or P-P?
Nevermind the outputpower just the sound Quality.
Schemas are welcome..
What would you think, if somebody suggest SE because it sounds better than PP and somebody Else says opposite?
I once let my hifi-friends to test one of my triode SE-amplifier. One guy liked so much, that he immediately wanted to build this. The other said that this was one of the worst tube amplifier he has listened.
Which one was right?
I once let my hifi-friends to test one of my triode SE-amplifier. One guy liked so much, that he immediately wanted to build this. The other said that this was one of the worst tube amplifier he has listened.
Which one was right?
There is SE, there is PP, and there is Totem Pole (one form of OTL).
I would not recommend OTL for a first project amplifier.
Others would recommend OTL (maybe they will build it for you, test it, fix it if needed, and test it again).
Power may not be important to the Original Poster, but loudspeaker minimum impedance is important, especially before deciding to build an OTL amplifier.
Measure the loudspeaker DCR. That is the minimum impedance of many loudspeakers.
Just my opinions
I would not recommend OTL for a first project amplifier.
Others would recommend OTL (maybe they will build it for you, test it, fix it if needed, and test it again).
Power may not be important to the Original Poster, but loudspeaker minimum impedance is important, especially before deciding to build an OTL amplifier.
Measure the loudspeaker DCR. That is the minimum impedance of many loudspeakers.
Just my opinions
Ofcourse we can think differently..
I have about 7-8 of them.
I dont wanna build an OTL..
What if I say p-p any one have a schema.
I have about 7-8 of them.
I dont wanna build an OTL..
What if I say p-p any one have a schema.
McProud 6AS7G PP, 1948
http://lilienthalengineering.com/100-amplifiers-chapter-1/100-amplifiers-part-2-1945-54
There is a comparision on distortion with Williamson pp amp
http://lilienthalengineering.com/100-amplifiers-chapter-1/100-amplifiers-part-2-1945-54
There is a comparision on distortion with Williamson pp amp
Attachments
There is a bunch of information here:
https://www.diyaudio.com/community/threads/6as7ga-as-push-pull-output.311405/
Plenty on google too, if you also check for 6N13 (Soviet version of 6AS7)
Thanks for the info!
One question ,in for exemplet "koonw's" first link theres an interstagetrafo used as a fase splitter.
I read that some People say that an IT trafo destroys yhe sound.
Or is it just what some People say and The other half dont?
One question ,in for exemplet "koonw's" first link theres an interstagetrafo used as a fase splitter.
I read that some People say that an IT trafo destroys yhe sound.
Or is it just what some People say and The other half dont?
Some insist to have interstage transformer, because it improves the sound. But technically it is not required. Sufficient drive voltage can be generated with normal RC-coupled stages.
That was in 40's maybe other phase splitter didn't even exist.
I notice that is capacitor para-feed circuit, so may be even better than an air-gaped one, you probably can use PP type IT, so low DCR winding and non-cap coupling guarantee no DC blocking on power tube grid bias.
I notice that is capacitor para-feed circuit, so may be even better than an air-gaped one, you probably can use PP type IT, so low DCR winding and non-cap coupling guarantee no DC blocking on power tube grid bias.
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artosalo,your design seems interessting.
I have a couple of 6sl7 and 6sn7 In my tube box.
How much power does it put out?
I have a couple of 6sl7 and 6sn7 In my tube box.
How much power does it put out?
You mean idle current in primary OT? Ia is equal to Ik, where Ik=2.2k, Ia=Ik=125/(2200+500/2)= 51mA
Another way is to replace cathode resistor with constant current sink for each cathode, these do away with any need for adjustment.
https://www.diyaudio.com/community/threads/transformer-coupled-6as7-6080.91626/post-1098816
That is another improvement over McProud amp
Here is a video and schematic for another PP amp:
http://www.diyaudiovillage.net/index.php?topic=19132.60
http://upic.me/i/ab/6as7ppp.gif
Another way is to replace cathode resistor with constant current sink for each cathode, these do away with any need for adjustment.
https://www.diyaudio.com/community/threads/transformer-coupled-6as7-6080.91626/post-1098816
That is another improvement over McProud amp
Here is a video and schematic for another PP amp:
http://upic.me/i/ab/6as7ppp.gif
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https://tubejack.nl/wp-content/uploads/2021/10/6AS7-Current-Balanced-PP-Amp.pdf
CCS as splitter, and CCSs for push pull output current balancing
CCS as splitter, and CCSs for push pull output current balancing
artosalo,should the voltage after the regulator be as high as 380v when the anodvoltage on 6as7g is only 124v?
Anode (to cathode) voltage = 250 V.
Cathode (to GND) voltage = 120 V.
Voltage loss across to output transformer = 10 V.
All together 380 V.
Cathode (to GND) voltage = 120 V.
Voltage loss across to output transformer = 10 V.
All together 380 V.
