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Old 21st February 2014, 02:59 PM   #1
tolip is offline tolip  Norway
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Default GU-50 triode

I have some questions about using GU-50 in triode connection. I've heard that I should not exceed 400V by much. What disadvantages would using higher voltage cause? I'm asking because I have a spare transformer and few GU-50s that I would like to use to build an A class.

Last edited by tolip; 22nd February 2014 at 02:32 PM.
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Old 21st February 2014, 03:13 PM   #2
tinitus is offline tinitus  Europe
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tried a forum search ?

I think there might be several threads with info
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Old 21st February 2014, 05:25 PM   #3
tolip is offline tolip  Norway
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Tried search and found several that mention 400V being reasonable but couldn't find an answer if 520V is still acceptable and what the disadvantages would be.
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Old 21st February 2014, 06:19 PM   #4
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I think Anatoliy aka Wavebourn is the right person to ask...
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Old 21st February 2014, 06:58 PM   #5
tinitus is offline tinitus  Europe
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could thermal run away be the issue with higher voltage ?

or voltage is also relative ... ?

did you say classA ?

I suppose that means SE ?

don't know if anyone use it in SE ?

but in classA, is voltage not lower than AB ?
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Old 21st February 2014, 07:25 PM   #6
tinitus is offline tinitus  Europe
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cathode bias ?
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Old 21st February 2014, 07:35 PM   #7
tolip is offline tolip  Norway
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Class A push-pull.
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Old 21st February 2014, 07:39 PM   #8
AJT is offline AJT  Philippines
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Quote:
Originally Posted by yagoolar View Post
I think Anatoliy aka Wavebourn is the right person to ask...
yes, he made a pp amp with 800 volts plate, look for the Pyramid amps.....Pyramid-IX monoblock, 200W from 4x GU-50
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Old 21st February 2014, 07:58 PM   #9
tolip is offline tolip  Norway
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Quote:
Originally Posted by AJT View Post
yes, he made a pp amp with 800 volts plate, look for the Pyramid amps.....Pyramid-IX monoblock, 200W from 4x GU-50
Yep, but it was in pentode mode.
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Old 21st February 2014, 08:49 PM   #10
JZatopa is offline JZatopa  United States
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wavebourn is the GU-50 expert, if he doesn't chime in here you may want to PM him. You can also find more info at his site.

I was considering building a pair of pyramids myself but I don't have the time and money right now. Maybe if he releases some PCBs I will be able to find some extra time and money.
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