Hi,
I wonder how its linearity is at ~400Vdc in triode mode/single ended. Any one has Triode curve of GU-50?
For single ended operation, how is this GU50 tube compare with KT88 and GM70?
Thanks.
I wonder how its linearity is at ~400Vdc in triode mode/single ended. Any one has Triode curve of GU-50?
For single ended operation, how is this GU50 tube compare with KT88 and GM70?
Thanks.
Hi
A google search for GU50 triode will reveal good results! I read somewhere that triode connected, the GU50 can take up to 400V (due to the limitation on G2).
I am also curious how it compares soundwise to a KT88... The GM70 will need some more volts on its plate, Brett (member) said it starts singing from 600V onwards.
Erik
A google search for GU50 triode will reveal good results! I read somewhere that triode connected, the GU50 can take up to 400V (due to the limitation on G2).
I am also curious how it compares soundwise to a KT88... The GM70 will need some more volts on its plate, Brett (member) said it starts singing from 600V onwards.
Erik
Triod variant is fine
This military tube have a good sound for Se and PP, in triod variant.
Have a big time of work.
Good soud with according 6E6P, 6E6P drive tube.
This military tube have a good sound for Se and PP, in triod variant.
Have a big time of work.
Good soud with according 6E6P, 6E6P drive tube.
I have Russian datasheet with triode curve, is too large to attach.
80ma 400V is limit as triode.
I suggest 4Kish load.
80ma 400V is limit as triode.
I suggest 4Kish load.
From my running of the curves at 400V 80ma, as you go into high impedances, you start trading off: more 3H, less 2H and less power. Is nice tube.
GM70 needs more volts and has a 60watt filament.
GM70 needs more volts and has a 60watt filament.
GU50 is a Russian version of Telefunken LS50 whose data sheet
can be down-loaded below.
http://www.mif.pg.gda.pl/homepages/frank/sheets/043/l/LS50.pdf
I purchased a Chinese amp using FU50 Triode Connection
Parallel single ended. FU50 is Chinese version of GU50.
My amp Manufacturer's Web page is below.
http://www.xshn.com/office/cpshow.asp?id=383
The schematics is indicated at the bottom of the Web page.
My amp is introduced in my blog(in Japanese) as below.
http://ja1cty.at.webry.info/200803/article_7.html
can be down-loaded below.
http://www.mif.pg.gda.pl/homepages/frank/sheets/043/l/LS50.pdf
I purchased a Chinese amp using FU50 Triode Connection
Parallel single ended. FU50 is Chinese version of GU50.
My amp Manufacturer's Web page is below.
http://www.xshn.com/office/cpshow.asp?id=383
The schematics is indicated at the bottom of the Web page.
My amp is introduced in my blog(in Japanese) as below.
http://ja1cty.at.webry.info/200803/article_7.html
There's a thread somewhere here concerning G2 limits of the GU50. The rather contentious consensus was G2 is more power than voltage limited at lower B+. Use a screen resistor, monitor G2 current and voltage, watch the product of the two. I've run it up to 600 VDC and heavy A2 on the bench without issue for about 12 watts SE into a 10k load. FWIW, I very much prefered the harmonic signature of the GU50 into that load over a KT100.
Gu50
Asd far as i know Russian GU 50 is a copy of Telefunken tube.
But spectral analise may show the difference.
But VA parameters the same.
Asd far as i know Russian GU 50 is a copy of Telefunken tube.
But spectral analise may show the difference.
But VA parameters the same.
The curves Ive seen on datasheets were indeed slightly different. The LS50 took a little more bias to run at 80ma 400V than did the GU50. YMMV. Possibly idealized curves on a datasheet are not necessarily the same as curves from the actual samples you are using.
It's written in Russian, but I guess you can read the graph (where 'B' means 'V' like in Volt - 'BAX' means btw Volt/Ampere-Characteristics).
If somethings unclear - contact me!
If somethings unclear - contact me!
Sorry, A bit off the topic
Any one know if the OPT for KT88 can be directly used as OPT for GU-50 ( both SE and PP)? Thanks.
Any one know if the OPT for KT88 can be directly used as OPT for GU-50 ( both SE and PP)? Thanks.
I have run GU50 on 5K anode load. That's my kind of answer.
Two gu50 in parallell shoudl be 2K5.
Two gu50 in parallell shoudl be 2K5.
soundbrigade said:I have run GU50 on 5K anode load. That's my kind of answer.
Two gu50 in parallell shoudl be 2K5.
I guess you means 5K "Push Pull" OPT?
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