italian style

Stee · 16th January 2009, 06:45 PM

http://translate.google.com/translat...istory_state0=

Stee · 16th January 2009, 06:51 PM

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

see this complete schematic

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.

Stee · 18th January 2009, 07:03 AM

now there is version 2
ready to test

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

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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17th January 2009, 10:46 PM	#4
Beto diyAudio Member Join Date: Feb 2008	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.

18th January 2009, 07:16 AM	#6
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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.

18th January 2009, 07:56 AM	#7
Symon diyAudio Member Join Date: Mar 2002 Location: Herts, UK	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

18th January 2009, 07:52 PM	#9
Symon diyAudio Member Join Date: Mar 2002 Location: Herts, UK	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 ..

18th January 2009, 08:06 PM	#10
Beto diyAudio Member Join Date: Feb 2008	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.