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-   -   italian style (http://www.diyaudio.com/forums/solid-state/136679-italian-style.html)

Stee 16th January 2009 06:45 PM

italian style
 
2 Attachment(s)
http://translate.google.com/translat...istory_state0=

Stee 16th January 2009 06:51 PM

Stee italian Style
 
2 Attachment(s)
CEFP
CFP + EF Output Stage

better use NTE37MCP as Final

NTE36(NPN) + NTE37(PNP) Matched Complementary Pair

TOSHIBA 2SA1930 + 2SC5171 as driver

Stee 17th January 2009 05:29 PM

Chet Amp application
 
2 Attachment(s)
see this complete schematic :rolleyes:

Beto 17th January 2009 10:46 PM

congratulations on the excellent project which the values of bias adjustment to 60ma. I can change the value of
R109 = 470r for trim-pot for 1k to set off-set.:att'n:

Stee 18th January 2009 07:03 AM

Thanks a lot Beto
 
2 Attachment(s)
now there is version 2
ready to test :) :cool: ;)

http://www.esafono.it/rotel.pdf

jaycee 18th January 2009 07:16 AM

The first circuit is simply Musical Fidelity's A1 power amplifier redrawn, without component values.

The "Chet Baker" Amp is a Rotel clone with a slightly different output stage - the graphics used for the schematic, style of compensation, plus the choice of transistors is identical to many Rotel service manuals.

Symon 18th January 2009 07:56 AM

The Chet Baker schematic has a Bryston style output, which can be tricky to keep stable.

One thing the 0.22 resistors in the collectors of the CFP output devices serve no purpose. I think they should be moved to the emitter side.

I'm interested to hear if it works

Stee 18th January 2009 08:38 AM

Thanks Symon
 
2 Attachment(s)
can you post a Bryston style output schematic example?

see the source of this idea:

http://www.esafono.it/ccc.pdf

Symon 18th January 2009 07:52 PM

there used to be a technical description on hte bryston web site, but can't find it right now.

take a look around the site.

Bryston Technical

this is the schematic of a Bryson amplifer

Bryston Schematic


You can also find discussion on Bryston amplifiers here on DIYAudio ..

Beto 18th January 2009 08:06 PM

In the original project could not a good result
modified some parts in the scheme to operate the simulator see the components changed:
R103 and R113 = 47k
R115 connecting a capacitor of 220uf to the ground.
R127 = 2k
Vr103 = 1k
R125 = 1k
q107 put capacitor 22pf of B / C.


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