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Old 5th April 2006, 08:07 AM   #981
digi01 is offline digi01  China
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recently building.
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Old 5th April 2006, 08:10 AM   #982
digi01 is offline digi01  China
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p2p inside.
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Old 5th April 2006, 08:14 AM   #983
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Default Good job

Hi Digi01
Is it a headphone Amp,
Which scheme you use?

Regards CHOW
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Old 5th April 2006, 08:16 AM   #984
digi01 is offline digi01  China
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it is a wcf circuit.thank you
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Old 6th April 2006, 06:27 PM   #985
jane is offline jane  Norway
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Default EchoFish and other fishes.

Click the image to open in full size.

Kitchen bench production the last 6 months, from left to right:

Valhalla: Based on KT90 in ultra linear, class AB2. Mullard/leak input technology with following gain stage and DC coupled cathode follower for power stage feed. (External power supply not on the picture). The amp runs with 10dB partial feedback from the primary of the OPTs back to the driver stage and 14dB global NFB.
Powerful amp with clean sound.
More information: http://www.veiset.net/valhalla/ (Norwegian only)

Sweep AMP: 6LU8 in PP pentode mode with stabilized g2 voltage, class AB1.
Very good little amp build around vertical deflection tubes. Makes 2x15W on a good day with reasonable low distortion. Most people who have listen to this one have been surprised over how well it performs.
More information: http://www.veiset.net/6LU8/ (Norwegian only)

Ekkofisk: (Echo Fish). A small amp based on 6EM7 parallel triode push pull with input transformer for the phase splitting. Painted in original Ford Mustand 67 blue metallic. For the moment it runs without any kind of NFB and sound sweet and warm, but a little bit "tubish" when put to the limit.
More information: http://www.veiset.net/6EM7/ (Norwegian only)

The Echo Fish playing with the other fishes at night time:
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Old 6th April 2006, 06:42 PM   #986
karma is offline karma  Canada
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wow nice work
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Old 7th April 2006, 12:55 AM   #987
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Default Re: EchoFish and other fishes.

Quote:
Originally posted by jane

Based on KT90 in ultra linear, class AB2. Mullard/leak input....
Hi Jane

Beautiful work indeed!
But: I never saw a KT90 with a shape of the glass envelope like the ones you are showing in your pics...
Can you spread some light on this subject (brand, cost, etc) on those KT90?

Thanks
Ricardo
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Old 7th April 2006, 04:51 AM   #988
jleaman is offline jleaman  Belgium
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Quote:
Originally posted by digi01
p2p inside.

digi01, I bet if you removed that pot and changed it to a alps. It would sound better. I have roof. When i was at Briangt's house 2 weeks ago he had that same pot in a chip amp. ICKK the firs thing we did was removed it and used a alps WOAH!! SOUND improved so much.


Jase
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Old 7th April 2006, 06:10 AM   #989
jane is offline jane  Norway
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Default Re: Re: EchoFish and other fishes.

Quote:
Originally posted by rwellerson
[B]I never saw a KT90 with a shape of the glass envelope like the ones you are showing in your pics...
Can you spread some light on this subject (brand, cost, etc) on those KT90?
The KT90s are Golden Dragon. I found them quite good sounding and reliable. The working conditions in this set up is Va=550V and Ia=60-65mA. It seems to me that it is possible to squeeze a little bit more power out of the KT90s than KT88s of the same (and other) brand.
I Norway KT90 is about 20-30% more expensive than KT88.
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Old 8th April 2006, 11:30 AM   #990
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Bleh, puke... tubeamps... too heavy, too much energy-consuming, too expensive... like mine?
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