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Old 4th September 2006, 07:00 AM   #501
Mad_K is offline Mad_K  Norway
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BTW, I found a used Aleph 30 the other day (very rare here in Norway). I'm looking forward to getting my hands on a original
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Old 4th September 2006, 02:30 PM   #502
lineup is offline lineup  Sweden
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woow
this thread still alive!

Mad_K
I was with you in beginning of 'One Transistor amp' thread
and also a bit in this SEWA project, if you remember me.

OTA - One Transistor Amplifier
Quote:
OTA - One Transistor Amplifier

I while back I posted a amplifier design with only one transistor. I named it SEWA (Seven Watt Amplifier). It seems most people interested in the design actually wanted LESS power (power dissipation I guess). While the SEWA design has evolved into something different (coming later), I have renamed this design OTA - One Transistor Amplifier. Attached is the revised schematic. Enjoy! And please let me/us know if you decide to try it
OTA - One Transistor Amplifier


I really like your work
And your way to go.
As 'audio father' Mr Pass did put it:
Keep it Simple, guys!
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Old 5th September 2006, 05:50 AM   #503
Tyimo is offline Tyimo  Hungary
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Hi Mads!

Can you open Eagle files?
I find an interesting preamp (the Kaneda preamp), but the schematic and PCB pictures are in eagle format. I tried to open with my eagle version, but I can see nothing......


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Old 5th September 2006, 07:20 AM   #504
Mad_K is offline Mad_K  Norway
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Shure, just send them over
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Old 5th September 2006, 07:22 AM   #505
Mad_K is offline Mad_K  Norway
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Hello again lineup Thanks for the roses. Your presence is more than welcome. A lot of guys here are interested in tube preamps/drivers for SEWA, maybe you can help?
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Old 5th September 2006, 08:42 AM   #506
lineup is offline lineup  Sweden
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Quote:
Originally posted by Mad_K
Hello again lineup Thanks for the roses. Your presence is more than welcome.

A lot of guys here are interested in
tube preamps/drivers for SEWA,
maybe you can help?
My tube knowledge and practical experience is very limited
at least compared to those in TUBE & VALVES forum.

I really would like someone start a topic in Tubes,
about preamp project for SEWA.
As many TUBE Guys also reads Pass Labs forum,
several people with good Tube knowledge, alread may know about SEWA.


In Tubes Forum
Topic could be this ( or similiar ):

Tube Pre Amplifier for SEWA 7watt Class A MOSFET

okay, I go create this topic now, myself!
With such a title it may attract a few active posters

See you.
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Old 5th September 2006, 09:01 AM   #507
lineup is offline lineup  Sweden
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Default tube preamp for sewa

Quote:
Originally posted by lineup

As many TUBE Guys also reads Pass Labs forum,
several people with good Tube knowledge, alread may know about SEWA.

In Tubes Forum
Tube Pre Amplifier for SEWA 7watt Class A MOSFET
Tube Pre Amplifier for SEWA 7 Watt ClassA MOSFET

The NEW TUBE Topic
for construction of tube pre amplifiers for SEWA

Tubes >Tube Pre Amplifier for SEWA 7 Watt ClassA MOSFET
Tube Pre Amplifier for SEWA 7 Watt ClassA MOSFET

Welcome!
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Old 5th September 2006, 09:02 AM   #508
hifryer is offline hifryer  Australia
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A comparaitive audition between a tube driven SEWA and a well designed 300B amp might be very interesting and revealing!

Both very similar power and SEWA much more cost effective IF as good ;-)
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Old 5th September 2006, 09:13 AM   #509
Mad_K is offline Mad_K  Norway
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Actually, SEWA has about 10% distortion with the low 22,5V supply driven full out. It is more like a 3W amp, but it clips gracefully, and it IS possible to get 7W from it. Running it on 30V rails with 5K6 R1(like Tyimo) I would rate it 7W
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Old 5th September 2006, 09:55 AM   #510
hifryer is offline hifryer  Australia
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OK, good 2A3 amp then!
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