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Old 27th July 2006, 02:34 PM   #1
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Default GU50 SE Amplifier class A , with 6SN7 Full construction details

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
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Old 27th July 2006, 10:30 PM   #2
Gluca is offline Gluca  Italy
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hemmm posting here would be great.

One question ... GU50 screen ... interesting solution ... any other details about that idea?
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Old 27th July 2006, 11:14 PM   #3
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I do that !!!!!!!

work perfekt without any problems ..
best regards
mario
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Old 28th July 2006, 10:58 PM   #4
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SE GU50 in triode mode .
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Old 29th July 2006, 10:02 AM   #5
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Hi Mario,

for triode mode you need a condenser across R12.

regards Andreas
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Old 29th July 2006, 10:08 AM   #6
EC8010 is offline EC8010  United Kingdom
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By the way, that 250V Zener in your original diagram is the wrong way up.
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Old 29th July 2006, 11:31 AM   #7
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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
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Old 29th July 2006, 02:25 PM   #8
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Hi Mario

Quote:
[i]... can you suggested capacitor value ,I can test.
...[/B]
Depends on low frequency margin of the amplifier.

Andreas
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Old 29th July 2006, 04:07 PM   #9
Zen Mod is offline Zen Mod  Serbia
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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.....?
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Old 29th July 2006, 04:42 PM   #10
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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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