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Old 1st May 2013, 09:19 PM   #5091
AJT is offline AJT  Philippines
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Quote:
Originally Posted by santa View Post
1628SE is the part number
thank you...
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Old 9th May 2013, 06:44 AM   #5092
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Default Atmosphere.

This amplifier is made in France. Atmosphere came to the Silicon Valley around 1990 to find a distributor in US. My friend was interested to be a dealer, they missed getting together couple times (back then there was no cell phone and when you are on the road, it is very hard to get in touch), so the meeting was never happened.
From what I remember, this amp has very good sound, and the transformer I believe was source from Millerioux (maker of excellent transformer), the amplifier cost around $5000 back then.

Quote:
Originally Posted by dady View Post
Hi Monsieur, I suppose that if EL34 and KT88 are in parallel but the original circuit uses either L34 or KT88, maybe the last owner interchange both types of tubes or get two pairs cause the other pair was reliable, they are similar for output in UL like this circuit but different tubes, one is pentode and the other is tetrode, the biases and currents and transconductances also are different the power dissipation too. I was looking for but I not found any vestigial of this trade name. Looks like Atma-sphere but is Français, from the external aspect looks like SState DIY with pretensions of Jadis. I steel prefer the Accuphase further looks like baby amp. Somebody want to listen it. Please maintain informed to us. Best Regards.
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Old 9th May 2013, 08:09 AM   #5093
dady is offline dady  Argentina
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Quote:
Originally Posted by Unison845 View Post
This amplifier is made in France. Atmosphere came to the Silicon Valley around 1990 to find a distributor in US. My friend was interested to be a dealer, they missed getting together couple times (back then there was no cell phone and when you are on the road, it is very hard to get in touch), so the meeting was never happened.
From what I remember, this amp has very good sound, and the transformer I believe was source from Millerioux (maker of excellent transformer), the amplifier cost around $5000 back then.
Sorry for the destiny of your friend I guess is a tragedy. The amps further looks great. Anyway googleing and surfing the web I couldn't find any extra data. Thanks for your info.
The clue here I guess is which valve uses on the output.
The mixing of L34 and T88 I suppose doesn't work at least with a good or accurate sound.
Please receive a great regards from Spain.
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Old 11th May 2013, 02:25 AM   #5094
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Default srpp

Mini SRPP 6n16p tubes...

Click the image to open in full size.

not quite finished, need to add a few more parts...
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Old 13th May 2013, 06:15 AM   #5095
tomchr is offline tomchr  United States
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Default Twins...

I finally finished my Damn Good 300B Amp. I built two stereo amps and am running a vertical bi-amp on a modified pair of KRK R6 speakers. I'm really liking it.

The amplifier contains three of my circuits:
- 21st Century Maida Regulator (mounted on rear panel)
- 3 x Universal Filament Regulator (stacked 15 mm between boards in the center)
- 300B Driver Board

I use JJ 300B and 6N6P driver tubes. The sound is sweet and the sound stage is rather remarkable.

Approx measurements: 30 x 40 x 25 cm (W x D x H). 17.3 kg each.

~Tom
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File Type: jpg 300B_Amp_Glow_1000x1500.jpg (222.5 KB, 316 views)
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Old 13th May 2013, 08:09 AM   #5096
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tomchr: very nice, very smart looking.
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Old 13th May 2013, 10:48 AM   #5097
zman01 is offline zman01  Bangladesh
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Tom,

Congrats - great looking amps you got there. In some strange way reminds of two Brabus Mercs parked side by side.

Those are Electraprint transformers?

And the album you got there in one of the pictures is a real good one too.

- Zia
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Old 13th May 2013, 04:30 PM   #5098
tomchr is offline tomchr  United States
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Thanks!

Yep. Electra-Print transformers (300B, 5 kOhm primary, 4 and 8 ohm secondaries, 100 mA, 20 W, copper). I like them!

~Tom
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Old 13th May 2013, 04:41 PM   #5099
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tomchr,

are they your own pcbs ?
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Old 13th May 2013, 05:34 PM   #5100
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He says so above...
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