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Old 2nd May 2008, 02:06 PM   #1
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Default Tube GU50 made in Russia

Hi everybody!
I have 4 tube GU50 made in Russia. I wonder whether it is good or not? if it is good, please let me know the proper circuit so that i can construct it by myself. Thanks.
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Old 2nd May 2008, 02:12 PM   #2
m6tt is offline m6tt  United States
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I've definitely seen those valves being used in audio circuits, so I imagine that they are good. I do not have any schematics for it unfortunately.
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Old 2nd May 2008, 02:53 PM   #3
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I have a GU50 in my TV set "Rembrandt". It is good.

Kind regards,
Darius
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Old 2nd May 2008, 03:52 PM   #4
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do a search and you'll find a few threads on this tube. I have to pick some up soon.
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Old 5th May 2008, 04:06 AM   #5
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Thanks you so much!
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Old 14th May 2008, 10:03 AM   #6
Dj Dog is offline Dj Dog  Romania
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hi everybody
my name is Florin and i'm new around here and i love tubes
please excuse my poor english


duongmt1980 see my attachements

single end - very simple
Click the image to open in full size.

single end with tone control
Click the image to open in full size.

push pull
Click the image to open in full size.

i have tested the simple one, it worked great and i am making another one
i can provide the output transformers

best regards,
Florin D.
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Old 27th May 2008, 03:39 PM   #7
geshka is offline geshka  Canada
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Hello Florin.

What is the output transformer do you use for the SE amplifier with GU50 (shown on first picture)?

Thanks
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Old 27th May 2008, 04:12 PM   #8
Dj Dog is offline Dj Dog  Romania
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Hello Geshka
The Output Transformer 2500 ohms / 8 ohms, made bay a friend of mine, who has a shop of transformers
Click the image to open in full size.
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Old 3rd August 2008, 04:15 PM   #9
Dj Dog is offline Dj Dog  Romania
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i have allmost finished a new SE amplifier with this tube
the sound is great for a RF pentode like GU50
i still have a little work to do at the case design
for now it's looking like this:
Click the image to open in full size.

if somebody it is interested in can provide Output Transformers for this tipe of amplifier for 35E for 1 piece
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Old 23rd August 2008, 08:47 AM   #10
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If the transformers are bifilar wound, have properly calculated airap, and he can porovide covers, i am interested
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