Hi, this is my new GM-70 SE amplifier. Two stages, using D3a (or my favourite E186F) as driver. I prefer copper plates GM-70.
Separated PSU enclosure. The power transformers have electrostatic screens. All of the power supplies are regulated or open-loop stabilized, including the 1100 volts. Uses a clean fixed bias circuit using Rod Coleman's CCS + resistor idea. Also uses Rod's heater modules. Has a microcontroller for power sequencing and protection (detects bias problems, overload, disconnected power cables, overheating).
Outputs 2x30W of Music, and the rest up to 650W electric power is converted into heat and lovely orange light...
Really one of the most professional looking builds! 650W?
Were is that going? Are the cooling blocks on the side really necessary? I would really like to see the schematic of this one!Really one of the most professional looking builds! 650W?
Me to
EL34 + ECC81 Balanced
This one was finished in november; schematic is from Menno van der Veen.
It is actually a rebuild with the original trannys and tubes from my first ever tube amp some 25 years ago. As the parts where lying around, I decided the re-use them. It also gave me a chance to design a new allround enclosure I could use for future projects, and try some new PCB tricks.
This one was finished in november; schematic is from Menno van der Veen.
It is actually a rebuild with the original trannys and tubes from my first ever tube amp some 25 years ago. As the parts where lying around, I decided the re-use them. It also gave me a chance to design a new allround enclosure I could use for future projects, and try some new PCB tricks.
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Really one of the most professional looking builds! 650W?
Thanks!
The regulated filament PSUs burn a lot of power, and the cooling blocks on the sides are quite necessary. I designed the amp to work with a mains voltage between 220v and 245v, so the excess voltage is transformed into heat.
Here is the schematic, with a disclaimer: "Serious shock hazard. Do not attempt to build."
Nope, no noise or hum audible; in fact when no music is playing it is almost completely silent. (even with ear on speaker) I remember one time switching between two amps to do an a-b comparison that I thought it wasn't properly connected
.The General Electric 6201 (ecc81) and the RFT EL34's are really good.
3A5 phono pre by Dmitry Nizhegorodov. Very nice preamp sound-wise. Dmitry didn't hesitate to thoroughly answer all the questions I had. A great guy, really... I started with with a Sankyo tape deck chassis and a Tamura power transformer. Continued with whatever parts I had at the time. Inside and outside aesthetics are sort of rough as the consequence but – the sound is what matters in the end
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Previous listening session lasted for over 6 hours. The tube shields were not even lukewarm. So no worry there.
Used to be one. Now it's just a battery holder.
This is my last build. I wasn't happy with it and it is now DEAD. Somebody might like the color. It's different.
Anyways, I'm not building crap anymore. Almost finishing an awesome tube amp now. It really takes a lot of planning, good planning, to build something....something you can feel proud of. Almost there. Slowly becoming a decent DIY man.
Anyways, I'm not building crap anymore. Almost finishing an awesome tube amp now. It really takes a lot of planning, good planning, to build something....something you can feel proud of. Almost there. Slowly becoming a decent DIY man.
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Very nice looking amps, the marble is a nice touch as is the VU meters on the first one.
What are the toplogies of these amps? They all look different from the single ended amplifiers I am used to seeing.