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Old 21st September 2011, 02:14 PM   #21
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@Jaap

I am using LED bias for the 6E5P drivers, 2 sets of 3 serial Red LED bypassed with 100uF capacitor, running from a B+ of 320V and a Rload of 10K

As for the GU-50, it is at a B+ of 420V with OPT 5K and biased at 80mA.
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Old 21st September 2011, 02:17 PM   #22
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Quote:
Originally Posted by quikie22 View Post
@Jaap

I am using LED bias for the 6E5P drivers, 2 sets of 3 serial Red LED bypassed with 100uF capacitor, running from a B+ of 320V and a Rload of 10K

As for the GU-50, it is at a B+ of 420V with OPT 5K and biased at 80mA.
OPT 5K seems too high or??
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Old 21st September 2011, 04:43 PM   #23
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Someone plotted out the curves for the GU-50 with different loads.

10K gave very linear performance at the cost of power,

5K gave a balance of distortion and power,

3.5K gave the most power but at expense of high distortion.

Guess I chose the middle road. :-)

Besides: The suggested value for the OPT was from the guru of GU-50 amps... Wavebourn. He has vast experience with these tubes and can design any circuit with the GU-50 that will run circles around any of the other commercial offerings using other NOS tubes.

Last edited by quikie22; 21st September 2011 at 04:50 PM.
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Old 21st September 2011, 05:36 PM   #24
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Hello quikie22

How much power you get now with your set up.
I ask because I want to buy the OP transformers. I think to go with 2 tubes I want to buy 3.2K that transformer also I can use for one tube.
To me 7-8W it would be plenty of power in triode mode (of course if the distortion not to high) for example with classical music. You know that sometime very powerful sometimes you hardly hear anything
I need at lease 7-8W with out high distortion

Greetings gabor
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Old 22nd September 2011, 12:20 PM   #25
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I never measured the power as I don't have the equipment to do so. But compared to another friends 6550 amp with 8W rating, the GU-50 sounds more powerful and detailed.
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Old 22nd September 2011, 01:06 PM   #26
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Thanks
That good to know!
Greetings!
Gabor
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Old 2nd March 2012, 12:05 PM   #27
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Default Translating GU50 specs

One of the hardest things I find with using the GU50 and working out circuits is my lack of ability to read russian .

I've attached a couple of pages of GU50 specs - could some kind soul please translate the words under the curves traces, and tell me how the tubes are connected up in each instance?

This would make planning bias circuits etc vastly easier and would help I think a lot of people take advantage of these awesome tubes!

Thanks in advance!
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File Type: jpg GU50-datasheet-150.jpg (86.3 KB, 407 views)
File Type: jpg GU50-datasheet-152.jpg (92.6 KB, 403 views)
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Old 2nd March 2012, 12:24 PM   #28
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For the first set of curves, pentode connection, screen voltage of 150V. Second set, triode connected.

Their example amplifier has some significant design flaws.
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Old 2nd March 2012, 12:35 PM   #29
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Thanks SY, in diagram 2.105 triode connection - is this just with G2 connected to anode or with G1,G2 and G3 all connected together to form a super gate?
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Old 2nd March 2012, 12:43 PM   #30
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As far as I can puzzle out, it merely states that it's in triode connection. Judging from the curves, it would be G2 to plate, G3 to cathode, signal at grid.
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