Photo Gallery

[miklos]

Jane,

Waveforms looking pretty good. One question, how can a triode amp be "ultra linear"?

 

[rcavictim]

Re: Just another amp..

An externally hosted image should be here but it was not working when we last tested it.

Designed and made some nice woodwork around an ancient Howard dialplate (escutcheon) in Art-Deco style..

Love it or not...

Kees

Art D. would have been proud very proud. Very nice. That ess....ess....escutcheon (sorry I have allergies to weird english words) begs a small O-scope display in there showing the audio signal or easier, two VU meters with the needle fulcrums at the outside centerline and the tips pointed inwards waving past each other..

 

[jlsem]

how can a triode amp be "ultra linear"?

Triode/Ultralinear would indicate he can run it in either mode.

 

[rpapps]

audiomanics
What a superb piece of craft.
It deserves a place in a museum of modern art.
Congratulations
Rob

P.S. What's inside?

 

[jamesjung21]

an ancient Howard dialplate (escutcheon) in Art-Deco style..

I was about to do exactly the same thing Darn, you did it first now !

Kind regards,
James

 

[audiomanics]

P.S. What's inside?

A little tube-stage, a huge supply and a lot of MOS-fets on a 10mm thick black-anodized aluminum frame (CNC-ed by myself) . Good for about 2x750WRMS/4Ohm (Yes 1500Watts RMS in total )

Kees

 

[jane]

Waveforms looking pretty good. One question, how can a triode amp be "ultra linear"?

6550 is a pentode (or beam tetrode) which I wired in (switchable) triode/UL. The custom made OPT has a 43% UL tap.

 

[audiomanics]

I was about to do exactly the same thing Darn, you did it first now !

Kind regards,
James

As you live at the other side of the world, probably no-one will notice..
You have a Howard escutcheon too??

Kees

 

[jamesjung21]

Not the same brand but same type of dial plate.

Is that a magic-eye indicator tube behind the dial plate?

Best regards,
James

 

[audiomanics]

No, just a few blue and red leds for status. (blue-operate red-standby)
With some difuser-glasses i managed to get a quite equal illumination of the whole surface behind the eye.. It realy looks very nice so. The blue is that bright that the luminosity is equal to the average in daylight. The red is deep and visible but equal in evening luminosity.. At night the switch illuminates the background so you only see the shape and the red eye..

Kees

 

[jamesjung21]

I was actually going to mount a magic eye indicator tube behind the tuning plate

But it's very nice to know that someone else on the other side of equator was working on a similar idea

James

 

[Bas Horneman]

Love it or not...

Love it big time!!!

 

[audiomanics]

Yes, and with my new horns (i had to do that while i blasted my others) it's what i call "BULDEREN"

 

[TomWaits]

Just Another Amp

A little tube-stage, a huge supply and a lot of MOS-fets on a 10mm thick black-anodized aluminum frame (CNC-ed by myself) . Good for about 2x750WRMS/4Ohm (Yes 1500Watts RMS in total )

Kees

Dude!...brilliant! I need to see some gutts. Lay it on us.

Shawn.

 

[planet10]

Very Metropolis... love it.... yea, show us under the bonnet.

dave

 

[audiomanics]

An externally hosted image should be here but it was not working when we last tested it.

Like this?

Or would you prefer to turn it around? (Yes, i know the aspect is wrong and the alignment too)
Howard movie

Kees

 

[TomWaits]

Like this? Or would you prefer to turn it around? (Yes, i know the aspect is wrong and the alignment too)
Howard movie

Kees

Very Compact, very neat. You are a masterful builder.

Shawn.

 

[Briney]

JEL 300b

Here's my 300b based on the JEL stereo 300b.

 

[karma]

nice

 

[rdf]

James and copper, nice indeed.