GU50 SE Amplifier class A , with 6SN7 Full construction details

mario2005 · 27th July 2006, 02:34 PM

Hi,
So, today I desing and built :

GU50 SE Amplifier class A , with 6SN7

Full construction details and my experience with GU50 SE Amplifier can be posted here, or sent to email if you need that.

Best regards
Mario2005

Gluca · 27th July 2006, 10:30 PM

hemmm posting here would be great.

One question ... GU50 screen ... interesting solution ... any other details about that idea?

mario2005 · 27th July 2006, 11:14 PM

I do that !!!!!!!

work perfekt without any problems ..
best regards
mario

mario2005 · 28th July 2006, 10:58 PM

SE GU50 in triode mode .

AndreasS · 29th July 2006, 10:02 AM

Hi Mario,

for triode mode you need a condenser across R12.

regards Andreas

EC8010 · 29th July 2006, 10:08 AM

By the way, that 250V Zener in your original diagram is the wrong way up.

mario2005 · 29th July 2006, 11:31 AM

Thanks for your comment,
Actually i dont use that 250V Zener ,only for protect 2 grid from
high voltage in case 275V or more.

Andreas , can you suggested capacitor value ,I can test.

I test russian triode 6N8S and have good result

If somebody need Transformers I have some excellent SE transformers in this range for 45 Euros . pair 90 euros about 115$

2K5/8R 140mA 25W

weight 4.5 kg or 9.9 lbs

Freqency response: 10Hz-45KHz (-3db)
EI-core 108 Waasner M 111-35 N

Toroidal power transformer 300W sec 320V.07A : 6.3V5A :6.3V5A :40V 0.6A for 35 EURO or 44$

Regards
mario

AndreasS · 29th July 2006, 02:25 PM

Hi Mario

Quote:

[i]... can you suggested capacitor value ,I can test.
...[/B]

Depends on low frequency margin of the amplifier.

Andreas

Zen Mod · 29th July 2006, 04:07 PM

Quote:

Originally posted by mario2005

If somebody need Transformers I have some excellent SE transformers in this range for 45 Euros . pair 90 euros about 115$

2K5/8R 140mA 25W

weight 4.5 kg or 9.9 lbs

Freqency response: 10Hz-45KHz (-3db)
EI-core 108 Waasner M 111-35 N

Regards
mario

you making them or.....?

mario2005 · 29th July 2006, 04:42 PM

Hi Zen Mod,

In cooperation with

http://www.tubeaudiolab.co.yu/

http://www.trafomatic.com/

I produce some tube PP SE and power audio transformers.

price is franco Belgrade

regards mario

29th July 2006, 10:08 AM	#6
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	By the way, that 250V Zener in your original diagram is the wrong way up. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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27th July 2006, 10:30 PM	#2
Gluca tarmac ripper diyAudio Member Join Date: Nov 2004 Location: Back to Italy	hemmm posting here would be great. One question ... GU50 screen ... interesting solution ... any other details about that idea?

29th July 2006, 10:02 AM	#5
AndreasS diyAudio Member Join Date: May 2005 Location: near Duesseldorf	Hi Mario, for triode mode you need a condenser across R12. regards Andreas

29th July 2006, 11:31 AM	#7
mario2005 diyAudio Member Join Date: May 2006	Thanks for your comment, Actually i dont use that 250V Zener ,only for protect 2 grid from high voltage in case 275V or more. Andreas , can you suggested capacitor value ,I can test. I test russian triode 6N8S and have good result If somebody need Transformers I have some excellent SE transformers in this range for 45 Euros . pair 90 euros about 115$ 2K5/8R 140mA 25W weight 4.5 kg or 9.9 lbs Freqency response: 10Hz-45KHz (-3db) EI-core 108 Waasner M 111-35 N Toroidal power transformer 300W sec 320V.07A : 6.3V5A :6.3V5A :40V 0.6A for 35 EURO or 44$ Regards mario

29th July 2006, 04:42 PM	#10
mario2005 diyAudio Member Join Date: May 2006	Hi Zen Mod, In cooperation with http://www.tubeaudiolab.co.yu/ http://www.trafomatic.com/ I produce some tube PP SE and power audio transformers. price is franco Belgrade regards mario

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