Tube GU50 made in Russia

[duongmt1980]

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.

[m6tt]

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.

[oldeurope]

I have a GU50 in my TV set "Rembrandt". It is good.

Kind regards,
Darius

[kstagger]

do a search and you'll find a few threads on this tube. I have to pick some up soon.

[duongmt1980]

Thanks you so much!

[Dj Dog]

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


single end with tone control


push pull


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.

[geshka]

Hello Florin.

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

Thanks

[Dj Dog]

Hello Geshka
The Output Transformer 2500 ohms / 8 ohms, made bay a friend of mine, who has a shop of transformers

[Dj Dog]

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:


if somebody it is interested in can provide Output Transformers for this tipe of amplifier for 35E for 1 piece

[costis_n]

If the transformers are bifilar wound, have properly calculated airap, and he can porovide covers, i am interested