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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Thu Feb 03, 2011 6:22 pm 
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http://www.scottbecker.net/tube/sheets/ ... L4.2P6.pdf

Sorry, my mistake, its 250V and 50mA, but max plate dissipation is 7.5W only.


 
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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Thu Feb 03, 2011 7:38 pm 
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quikie22 wrote:
http://www.scottbecker.net/tube/sheets/ ... L4.2P6.pdf

Sorry, my mistake, its 250V and 50mA, but max plate dissipation is 7.5W only.


Plus 1.5W by screen grid: it is triode connected.

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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Fri Feb 04, 2011 7:12 am 
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total of 9W max , but running .4W higher than that... really living on the edge Smile I like it. I am running my 6P14P at extreme ratings too....really hot, but sounds really good.

Input miller cap also quite high 8-10nF, will need a strong driver too. Thinking of full pentode drive. Maybe 6P1P. Any thoughts?


 
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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Fri Feb 04, 2011 8:43 am 
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quikie22 wrote:
total of 9W max , but running .4W higher than that... really living on the edge Smile I like it. I am running my 6P14P at extreme ratings too....really hot, but sounds really good.

Input miller cap also quite high 8-10nF, will need a strong driver too. Thinking of full pentode drive. Maybe 6P1P. Any thoughts?


Too many thoughts, trying to understand what do you mean. Which tube? Can you draw schematic?

I use free software Rimu Schematic to draw.

0.4W more is nothing special tor 9W tube, especially for military one.

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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Fri Feb 04, 2011 3:10 pm 
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4P1L has input capacitance of 8-10nF, which is quite high. Thinking of using the 6P1P instead of 6J5P+6N16B. Apart from the possible blocking distortion, any other thoughts?


 
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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Fri Feb 04, 2011 10:16 pm 
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Where did you get 8-10 nF? Shock

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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Sat Feb 05, 2011 5:47 am 
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My apologies, it's a typo again, its 8-10 pF.

Which is still a substantially high value, In triode, probably even higher.


 
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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Sat Feb 05, 2011 10:37 am 
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Capacitance between anode and first grid for 4P1L is 0.1 pF. I can't find capacitance between screen grid and control grid, but if it is about 1 pF, you are right, and 10 pF Miller is not high value, and for 20 KHz it is slight less than 1 megaOhm impedance. Any driver with 10 mA idle current will make it happy.

Speaking of power, it is as if designed by Telefunken for triode mode: in pentode mode screen grid current varies a lot, if to compare with other pentodes: it has more dense anti-dynatrone grid to remove tetrode kink.

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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Sun Feb 06, 2011 9:19 am 
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Ok, now I understand. So technically will be an easy tube to drive. Easier than many other output tubes.

Was thinking of pentode drive because you mentioned earlier that you used 6P15P in pentode to drive the GU-50 to give a nice sound. Thinking that a pentode driving the 4P1L will give good sound too.

What about using the 4P1L to drive another 4P1L? Wink It seems some Japanese guy is using that technique (300B drives 300B) .... although it seems pretty funny but his reason seems reasonable. Of course in this mode, both tubes will be run as triode as they were designed to run best in triode. Bad or good idea?

Sorry for so many funny thoughts and questions. Just want to learn.


 
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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Sun Feb 06, 2011 10:23 am 
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It is a common practice in Russian High-end circles to use 4P1L to drive 4P1L. But I decided to go with 6J5P in triode plus 6N16B as a cathode follower to drive 4P1L. 6J5P will be loaded on BSP225 gyrator.

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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Mon Feb 07, 2011 8:05 am 
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Soldering power supply...


Attachments:
soldering_ps.jpg
soldering_ps.jpg [ 222.82 KB | Viewed 9686 times ]

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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Mon Feb 07, 2011 8:12 pm 
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Looks good. Seems a little complicated with so many bypass caps and even a super miniature tube on it. Regulated supply like the previous schematic you showed me?
BTW, talking about power supplies, what are the parameters and is this tube useful? 5C8S (5Ц8С). http://istok2.com/data/303/ . It seems that Anode voltage of 75V is too low? Or did I interpret the datasheet wrongly?


 
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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Mon Feb 07, 2011 9:23 pm 
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The tube on the picture is 6N16B, a miniature twin triode, it amplifies voltage before rectification for 6E1P indicators.
5Z8S is a powerful rectifier, used in military equipment, for up to 420 mA rectified current.

http://www.jogis-roehrenbude.de/Russian/5U8C.htm

Since this amp is single ended, I want to power it from very stiff and clean supply, almost like from batteries, to check what can be obtained from linear tubes with zero negative feedback. Just an experiment. May be I will reuse the chassis and power supply, if don't like the result, for something with about 10W output power in SE per channel.

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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Tue Feb 08, 2011 10:02 am 
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I am pretty sure you will like the DHT-SE sound, especially your circuit design should work very very well. I certainly prefer my SE GU-50 amp to my MOSFET-PP amp. Wink especially when I am listening to some nice soft music.

But for rocking out music during a party, it is hard to beat a powerful PP amp.

Let me know how it sounds without feedback. Maybe I will build something similar to this one too.


 
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 Post subject: Re: GU-50 Single Ended Amplifier Design
PostPosted: Wed Feb 09, 2011 3:14 am 
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hehehe... ordered my 6N16B already... but will use the 6P1P instead of 6J5P.


 
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