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Old 13th June 2006, 04:22 PM   #1101
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by ddd

I could describe arnoldc's design as brave and out of temporary fashion. That's why I liked it.

exactly;that's why I wrote "Ugly!"
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Old 13th June 2006, 10:18 PM   #1102
ddd is offline ddd  Bulgaria
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Then
Sorry for misunderstanding.
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Old 22nd June 2006, 08:50 AM   #1103
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Default ARITMA 6W Stereo Amplifier

Hello,

I'm from Romania and I have to show you my latest work. This is my 6W Stereo Amplifier. ARITMA was written on the box. I thought it's a good name for a home-made amplifier.

Click the image to open in full size.
Click the image to open in full size.

For more photos and other tube projects I've made across the time, please visit:

http://www.lumeatuburilor.go.ro
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Old 22nd June 2006, 07:05 PM   #1104
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Hello again,

Now I have some time to say something about the amplifier posted above (when I posted it I was at work):

The amplifier is build around 2 EL84 (so it is a SE) configured as pentodes (by default). Preamplifier is made with an ECC83.

For my amplifier, I have chosen Russian tubes (tastes... tastes... everyone with his tastes) so I used 6P14P (EL84) and 6N2P (ECC83). Filament power supply is regulated and well filtered (with 10.000uF capacitor) so no hum is induced. B+ is filtered by 4x220uF capacitors.

Rectification is done through silicium bridges.

Any questions, I'm happy to answer.

ALEKS
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Old 23rd June 2006, 04:02 AM   #1105
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Default Holly Smokes!

Quote:
Originally posted by ALEKSANDR
Hello again,Any questions, I'm happy to answer. ALEKS
Wow! Where did you get the handsome case, your layout inside seems perfect? How does it sound? Do you like it? And what speakers are you using. Approximately how much $$ to build it and can you tell us about the schematic? Is it from a kit?


P.S. Do I ask to much?
P.S.2 About time this thread turned around!

Shawn.
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Old 23rd June 2006, 07:19 AM   #1106
Giaime is offline Giaime  Italy
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Hello Aleks,

is it really pentode mode without feedback?

It can sound good to you, but surely it won't measure good

Good work!
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Old 23rd June 2006, 12:34 PM   #1107
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Hello,

The case is from an old power supply made in Czekoslovakia (hope I wrote it correctly) - that's before 1990 (these days it's Czech Republic). The name ARITMA was written on the case so I thought it's a perfect name for my amplifier. More pictures with the case (from it's entire construction process) could be found on my site, right at this address:

http://www.lumeatuburilor.go.ro/Arit...206W/index.htm

Also the schematics is there. The schematics is my conception and the amplifier is not build from kits. All you see there is just my work. I spend about a year collecting parts and putting them back toghether. The entire work costed about $150 (although I had the tubes).

As for the speakers, a pair of Sony MF-450SS is what I use with the amplifier. It sounds sweet and bass response is quite good.

P.S.: When it's about tubes, you do not ask to much questions (as someone said before in this thread, "tubes passionates are friendlier").

ALEKS
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Old 23rd June 2006, 12:34 PM   #1108
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Quote:
Originally posted by Giaime
Hello Aleks,

is it really pentode mode without feedback?

It can sound good to you, but surely it won't measure good

Good work!
Hello Giaime,

It is true pentode, without global / local feedback.

Thanks for the kind words.

ALEKS
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Old 23rd June 2006, 05:08 PM   #1109
Giaime is offline Giaime  Italy
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Have you measured frequency response and output impedance?
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Old 23rd June 2006, 05:21 PM   #1110
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Output impedance is dictated by the transformer. These transformers have Z=4ohm in secondary (no. of sp.: 108). They were recovered from an old Russian TV-set called Rubin 102B. Primary impedance is cca. 5Kohm (no. of sp.: 2200).

Unfortunately I can't tell you aboute the audio spectrum covered by this amplifier.

Regards,
ALEKS
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