SEWA - Seven Watt Amplifier

[Tyimo]

Hi MIKET!

Could you post your CCS loaded 6C45 schematic? I am looking for a good tube pre for my SEWA.

Greets:

Tyimo

 

[MIKET]

6c45pi w/CCS

Attached is the schematic for the 300B driver which is a CCS loaded 6C45Pi, note it is running at 220VDC. You can run the 6C45PI with a 1 K plate resistor at aprox 24V and no CCS.

 

[Tyimo]

Thanks MIKET!

What do you think, is it not too weak to drive a Mosfet?
Has it +/-20V out put? (on +24V supply)

Greets:

Tyimo

 

[hifryer]

SEWA

OK, thanks.

what is the role of the 2R7 in the ground line??

cheers

 

[mystang]

Hello Tyimo,


ne haragudj, hogy ilyen csacsi kérdéssel zavarlak, de szeretném megtudni, egész véleletlenül nem Te vagy Németh Sándor, aki a Vasvári Pál gimnázium sporttagozatos osztályában érettségizett?


Solti Marietta

 

[Netlist]

I know a few languages but no Hungarian, as most of the members I presume. Could you please translate? 🙂

/Hugo

 

[Tyimo]

Hi Marietta!

Please send me a private E-mail!

May be I have some interesting informations for you!
😉

Greets:

Tyimo

 

[Tyimo]

Hi Hugo!

Sorry, Marietta asked an off topic question about Who is behind my nickname... Nothing to do with HI-FI 😀

Greets:

Tyimo

 

[Tyimo]

Hi Mads!

Wow! You guys blow me away! Nice report Tyimo!

Thanks!😉

You would have to get smart and cascode etc like ZV9.

Unfortunately I have never seen any cascoded source follower circuit.....

I think it is better to design amps that you can use parts that are already in the thrash box

Yes! But my 6 pieces Lovoltech JFets are in the trash box!😀 😀

Would it be possible to use them for a JFet BOZ???????

Tyimo

 

[Mad_K]

BOZ is with a mosfet. For a preamp, there are better JFET alternatives.

 

[Mad_K]

Re: SEWA

OK, thanks.

what is the role of the 2R7 in the ground line??

cheers

http://www.diyaudio.com/forums/attachment.php?s=&postid=912796&stamp=1147286502

Just some resitance to dampen gound loops. It has since moved to the powersupply in form of a thermistor 😉

 

[Ryssen]

what Thermal Resistance
C/Watt for 80 °C rise,do you recomend for SEWA???🙂

 

[Mad_K]

0,5'C/W each channel @25'C with 2A bias and 22,5V rails is what I use.

PS -I'm leaving town to Grovare, Sweden (near Göteborg) to celebrate my grandmother's 75th bithday at her summer house tonight. I'll be back in business on monday 😉 And to buy plenty of cheap SNUS 😉 😉

 

[Ryssen]

And to buy plenty of cheap SNUS

Happy holliday,I had to stop snusa for healt reason.😉

 

[Mad_K]

Happy holliday,I had to stop snusa for healt reason.😉

Thank you, I probably should stop too, but.... you know. 😉

 

[MIKET]

Thanks MIKET!

What do you think, is it not too weak to drive a Mosfet?
Has it +/-20V out put? (on +24V supply)

Greets:

Tyimo

The circuit as drawn will have no problem generating enough swing in voltage and will have a gain of about 30. The output resistance should be sufficently low to drive the MOSFET.

 

[MIKET]

I changed my avitar after 2 years being the same

They say you are what you eat, so what does that make me???????

 

[hifryer]

SEWA

Mads,

Whay is now the role of the 100R R3?

cheers

 

[mystang]

Hy Tyimo 🙂


Thank you very much for your answer, I would be really very happy, if you could help me somehow!

My private e-mail Address: mystang@freemail.hu

I am looking forward to hearing from you!


Marietta 😉

 

[MIKET]

Tube voltage amp for SEWA

Here is the circuit I am going to drive SEWA with.