Photo Gallery

[cgraf]

Pete Millet Mighty Midget

Hi, I thought to share with you my lastest project: Mighty Midget from Pete Millett. As I wanted to make a white Amp I called it the mighty white midget.

Best regards
Christoph

 

[mhouston]

Hi, I thought to share with you my lastest project: Mighty Midget from Pete Millett. As I wanted to make a white Amp I called it the mighty white midget.

Best regards
Christoph

Nice clean build.

 

[IanS1]

Picture of my new DAC unit.

Wow, that looks like a very nice build. It would be nice to hear more about the details.

 

[Vincent77]

the mighty white midget.

Very nice!

 

[boywonder]

That looks great!

cgraf: How did you do the front panel graphics?

 

[Miguel Lopez]

My first work with vacuum tubes. And all-Soviet super vintage audio amplifier.

 

[Vincent77]

It really looks vintage! I like the 6Е1П on the front panel.

 

[Miguel Lopez]

Well, in fact, the magic eye is one of the few pieces which are not Soviet. That's a Czeck TESLA EM80 (equivalent to the 6E1P). The cabinet is also from a TESLA equipment. Some components are older than myself.

 

[ricohman]

I just finished a complete rebuild on these Dynaco Mark VI monoblocks. Nearly every resistor was out of tolerence and I replaced all the film and electrolytic caps. All new tubes as well.
These are my first tube amps and first project.

Also acquired these Tube Technology Genesis monoblocks. Don't know much about them and I am in need of a manual.

 

[807tubenut]

My DCPP

Bolivian rose wood sides, aluminum top.
westinghouse tubes throughout, 6JM6 outputs with 6CB6 drivers.

 

[vinylkid58]

My DCPP
Bolivian rose wood sides, aluminum top.
westinghouse tubes throughout, 6JM6 outputs with 6CB6 drivers.

Nice work. Love the Rosewood.

jeff

 

[mhouston]

807tubenut, looks good.

 

[TonyTecson]

pitures for posterity...

 

[Cassiel]

I can't see ****

I can hear say.

It was quiet and the night was dark.

 

[Cassiel]

Oops. Forgot one.

 

[807tubenut]

Thanks, working on a couple preamps now.

 

[mhouston]

Tony: in the next amp where you have the the caps poking through cut off the outer plastic wrapper and spray them. I did it on a amp years ago and it looked good.

Cassiel: love the Meccano look.

 

[TubeManiac]

Sure. Here is the GM-70 SE amp that I've just (almost) finished.

My own schematic, but it's nothing really special.

It outputs a measured 29W RMS before distortion shows. The first stage is a CCS loaded, LED biased D3a (the photos were taken with an E186F in that position). The D3a has enough swing to drive the GM70 into clipping.

The GM-70 are fixed bias. They are constantly monitored by an Arduino microcontroller that I've programmed, which switches off the amp in case of problems. It also does soft start and temporisation, plus LED control to indicate status, problems or overload/clipping.

OPTs are custom gapped (90mA) Lundahl LL1688.

The supplies are in a separated chassis. There are no filtering chokes in my supplies - it's done with Mosfets and SiC Schottky rectifiers, including the 1050v GM70 supply. The kilovolt supply is not stabilized, only filtered;
the 350v supply is stabilized, not regulated (I do not like the sound of regulated supplies).

Together with Rod Coleman's filament supplies, this makes the amplifier absolutely silent, ear to the (95dB) speaker.

It sounds great.

Awesome ! I hope you have a lot of spare GM70 tubes. They are not much sold on ebay anymore except the copperplate version.

 

[Stixx]

Oops. Forgot one.

From Cassiel's dark caverns...
I almost can hear tortured souls screaming... or is ist oscillation 😛

 

[Cassiel]

Light! I can see the light!

🙂 Feet not glued yet, one photo is no good. OK, now I'm done with this. To the next project.