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Old 3rd March 2005, 04:47 PM   #1
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Default Lamm schematics

Does anyone have schematics for Lamm M2 amp? Is there any way to get the schematics? If not, could anyone recommend a different amp, with readily available schematics, that is on the same quality level more or less?

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Old 24th March 2005, 03:57 PM   #2
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Default Did you mean Lamm ml2 ?

http://www.chambersaudio.com/Lamm_ml2.html
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Old 24th March 2005, 04:19 PM   #3
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Anyone knows why this thing is so expensive? Hammond chokes?!
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Old 24th March 2005, 05:25 PM   #4
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Default Lamm schematics

Lamm (in Russia his surname was Vladimir Shushurin) not publishing his schematics, but:
1)output tube - 6C33C (russian super power triod)
2)power supply consists too 6C33C as regulator

You may build another good SE 6C33C amp:

http://www.metaleater.narod.ru/6c33c.gif

and regulator:

http://www.metaleater.narod.ru/regulator.jpg
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Old 24th March 2005, 06:44 PM   #5
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Default Re: Lamm schematics

Konnichiwa,

Quote:
Originally posted by eitanwaks
Does anyone have schematics for Lamm M2 amp? Is there any way to get the schematics? If not, could anyone recommend a different amp, with readily available schematics, that is on the same quality level more or less?
I doubt you can get the exatc schematic, but quite frankly, what Vladimir Shushurin does is easy enough to decode.

The signal circuit uses a 2-Stage driver with 12AX7 & 6N6. You can find similar circuits in 6S33 Amplifiers from Audio Professor Japan (they have schematics on their website) among others. Some such Schemes use SRPP -> DC couled Amplifier Stage -> AC couled to Cathodefollower which drives directly the 6S33, like this:

Click the image to open in full size.

I suspect Vladimir Shushurin uses a simple RC coupled 2-Stage variant of this, no cathode follower. You find the same sort of thing also in the 300B & 211 SE Amp from Air Tight.

6S33 is fixed bias run with a lot of current and low anode voltage. I think I mentioned the values in another thread on the 6S33 (175V/300mA - I just checked).

PSU is regulated with a very classic valve regulator circuit Neon reference, Pentode Error Amp and 6S33 Regulator. I call such circuits generica simplicima.

The transformers are claimed to be rather unusual and custom, so you'll be out of luck on exact copies.

But from the damping factor/output impedance of the Amp (2R @ 16 Ohm Load) and the 6S33's anode impedance (80R) you can work out the ratio as 640R primary, so any really good, big and high primary inductance OPT with 600R Primary and 300mA DC current handling will do.

Sayonara
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Old 24th March 2005, 06:58 PM   #6
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I like 2 stage amps.

I built this amp 3 years ago:

http://www.metaleater.narod.ru/6c33c.djvu

- schematics by Anantoly Manakov
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Old 24th March 2005, 07:05 PM   #7
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Quote:
Originally posted by analog_sa
Anyone knows why this thing is so expensive? Hammond chokes?!
The amps possibly have a silver wire OPT, but I'm guessing saying that. Any amp that can claim the title "best" by reference to published reviews can basically set its price, even if that amp betters the competition by only a hair. I don't doubt the amp is by some measure good, and that it probably betters its competition. I do doubt it approaches the actual existing state of the art.
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Old 24th March 2005, 07:40 PM   #8
grataku is offline grataku  United States
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The reason for the $$$ of Lamm equipment?

Cost of doing business in NYC ( rent, parking, paying off the both the italian and the jewish mobster)
A 20 bucks hammond choke can quickly turn into a 2 grand ordeal.
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Old 26th March 2005, 02:53 PM   #9
jlsem is offline jlsem  United States
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Quote:
Anyone knows why this thing is so expensive? Hammond chokes?!
$29,000+ for 6C33C amps is ridiculous. One of the funniest things I've ever read read in Stereophile - when asked if there were any way to improve the amplifier, Shushurin said he would like to add a vacuum tube rectifier, but it would be too expensive.

Actually it wasn't that funny, it made me angry.


John
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Old 26th March 2005, 04:33 PM   #10
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Quote:
rent, parking, paying off the both the italian and the jewish mobster
If your name is Shushurin you can also add the russian mobster to the payroll
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