6EM7 SET Amplifier
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- Опубліковано 15 жов 2024
- This is my 6EM7 Single-Ended Triode Hi-Fi amp that sits on my desk. I use it almost every day and it sounds great. It's only 2.2 watts per channel (probably less with these tubes) but fills the small room well enough. There are no solid-state components in this amp, it's all wood, glass and steel. Solid-state fanboys click away now. I did not design this circuit, however I did design the enclosure. It uses Edcor transformers which are way overrated for the current being drawn, perhaps to give better low and high-end frequency response.
Power efficiency is actually something like 8%. - Наука та технологія
I've built a SET 6p15p-EV (EL83) Russian tubes with the exact same Edcor Transformers you used,no Negative feedback,played with my DIY Altec 604-8g's and it is really loud.
I will be doing a variation on that design . You would be amazed how cheap you can make one for experimentation. I will be using a DC-DC converter for power and 70 volt line matching transformer for output. It will be around 40 dollars total.
Awesome! I was wondering how much it would cost to make something like this with a switching supply and whatever transformers are laying around. Do you think you'll use 6EM7s or triode-strapped pentodes like 6V6s or EL-84s?
@@thetuberoaster8321 I will use 6EM7. and 70 volt line matching transformers. The power supply will be a DC-DC converter from ebay. It is 8 - 32 volts in, and adjustable output from 45 to 390 volts. If you are doing mono, add a 3 amp buck converter to make the filament supply, or if stereo, tie the filaments in series. Use a 12 volt primary power supply for the system. I have had great luck making other tube amps with the same manner of power and output transformer. These are only goof for amps for about 1 or 2 watts per channel. the transformers saturate at any higher power.
I am thinking about a class A PP with these. My thought to get around the matching is to use the small signal side as a driver for the power side with local ( plate to plate or plate to cathode) FB. This would require another dual triode preamp tube for the phase splitting (and slight VAS) but would be worth it I think to reduce the need for tube matching.
That sounds like a good idea actually. With driver tubes you might be able to run in class A2 or AB2 and get a fair amount of power and low distortion. Maybe a 6SN7 or 12AU7 as the phase splitter.
PSU negative-output is floating, because there's no earth-symbol in the circuit-diagram. It will sure perform better when connected.
Good catch. I didn't mark it in the schematic but in the actual amp the power supply is earth grounded at the capacitor bank.
@@thetuberoaster8321, Never had any doubt about thát. :-) .. Very nice project indeed ! .. Love its simplicity.
You know, sometimes reducing components can be a challenge too, just for sports.
Once I built an AM-transmitter with a personal challenge only to use scrap-components.
Which part numbers of chokes did you use? I am a beginner and those are the only thing I am missing.
The large 10H choke is a Hammond 159P and the two small 1H chokes are Hammond 158SAs.