Photo Gallery - Page 99

digi01 · 5th April 2006, 08:07 AM

recently building.

digi01 · 5th April 2006, 08:10 AM

p2p inside.

audio3chung · 5th April 2006, 08:14 AM

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

Regards CHOW

digi01 · 5th April 2006, 08:16 AM

it is a wcf circuit.thank you

jane · 6th April 2006, 06:27 PM

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:

karma · 6th April 2006, 06:42 PM

wow nice work

rwellerson · 7th April 2006, 12:55 AM

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

jleaman · 7th April 2006, 04:51 AM

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

jane · 7th April 2006, 06:10 AM

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.

audiomanics · 8th April 2006, 11:30 AM

Bleh, puke... tubeamps... too heavy, too much energy-consuming, too expensive... like mine?

5th April 2006, 08:14 AM	#983
audio3chung diyAudio Member Join Date: Sep 2005	Good job Hi Digi01 Is it a headphone Amp, Which scheme you use? Regards CHOW

5th April 2006, 08:16 AM	#984
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	it is a wcf circuit.thank you __________________ 2010 DIY ALBUM UPDATED UCPv1(preamp) & DUAL(power supply)

6th April 2006, 06:27 PM	#985
jane diyAudio Member Join Date: Jul 2004 Location: Norway	EchoFish and other fishes. 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: __________________ Life is hard - Then you die.

6th April 2006, 06:42 PM	#986
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	wow nice work __________________ http://www.karmaelectronics.info

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