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 Post subject: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Mon Apr 11, 2011 12:05 pm 
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Шаман, типа...

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Local audiophiles were impressed by the sound of parallel 4P1L, but want more power.
viewtopic.php?p=25393#p25393
So, I have 2 weeks to build a working prototype of a new amp.
What I am going to do, to use paralleled GU-50 tubes in pentode mode with local feedback from anodes to first grids, driven similarly to what I used for Gubernator-VII amp.

I'll draw schematics later, now have to build a chassis to put it on.

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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Mon Apr 11, 2011 4:00 pm 
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First steps...


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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Mon Apr 11, 2011 11:43 pm 
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Joined: Fri Mar 19, 2010 8:59 am
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I couldn't ask for more Smile

Which EDCORs OPTs are those or are you going to use?

What punch diameter do the GU-50 sockets need?

That orange is already "Wavebourn Orange" Smile


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Tue Apr 12, 2011 1:41 am 
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pukkita wrote:
I couldn't ask for more Smile

Which EDCORs OPTs are those or are you going to use?

What punch diameter do the GU-50 sockets need?

That orange is already "Wavebourn Orange" Smile



I used 50mm (2inches) for mine, but suspect 48mm may be a better fit. Do note that I am using the slightly smaller aluminium sockets instead of these cast ones.


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Tue Apr 12, 2011 1:42 am 
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wavebourn wrote:
"local feedback from anodes to first grids"



Schade?


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Tue Apr 12, 2011 7:06 am 
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Шаман, типа...

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Location: Pleasant Hill, California
quikie22 wrote:
wavebourn wrote:
"local feedback from anodes to first grids"



Schade?


Yes, what now is labeled as Schade. Wink

However, Schade meant that local feedback is necessary for usage of 6L6, not necessary parallel one.

http://www.clarisonus.com/Archives/Tube ... 0Tubes.pdf

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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Tue Apr 12, 2011 8:31 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7252
Location: Pleasant Hill, California
pukkita wrote:
I couldn't ask for more Smile

Which EDCORs OPTs are those or are you going to use?

What punch diameter do the GU-50 sockets need?

That orange is already "Wavebourn Orange" Smile



Image


Image



Image

_________________
А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Tue Apr 12, 2011 11:19 pm 
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Joined: Fri Mar 19, 2010 8:59 am
Posts: 21
So the usual aluminum ones are more like 48mm... thanks quikie22!

I always end up surprised... Smile

Using screws to prevent wrecking/wobbling and get accurate cuts, also preventing the sheet from getting stuck inside the hole-saw is as always, a killer, "how didn't I thought on that!" idea... Smile


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Wed Apr 13, 2011 6:51 pm 
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Шаман, типа...

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Yep, using screws is logical: wood, perforation. Wink


Image


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А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Thu Apr 14, 2011 1:45 am 
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wavebourn wrote:
Yep, using screws is logical: wood, perforation. Wink


Image


Image


Image


As again, great work. Let me guess the cathode follower tube, 12L6? Drivers = 6J5P?


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Thu Apr 14, 2011 8:29 am 
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quikie22 wrote:
As again, great work. Let me guess the cathode follower tube, 12L6? Drivers = 6J5P?


Yes, 12L6GT cathode followers. But 6J9P-E drivers.

6J9P will work on 15 mA, with 150V on screen grid, 1.6V IR LED in cathode, 13K anode load, powered from stabilized 360V. Anode voltage will be around 150V at idle. It has 17 mAV, so in case of too high amplification I would replace LED by 100 Ohm resistor. Or, increase feedback around output toobs. Or both.


Attachments:
6j9p.gif
6j9p.gif [ 66.59 KB | Viewed 9088 times ]

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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Thu Apr 14, 2011 10:59 am 
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Шаман, типа...

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They look differently. But would work in the same regime, except D3a has 34 mAV VS 17 mAV for 6J9P.

http://4tubes.com/DATASHEETS/SCANS-Orig ... hilips.pdf

Image

Image

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А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Fri Apr 15, 2011 1:35 am 
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anatoliy, what was your experience with 6J52P? I have some bought in 2008 from gstube, will they be a suitable replacement in this project?


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Fri Apr 15, 2011 3:47 am 
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pukkita wrote:
anatoliy, what was your experience with 6J52P? I have some bought in 2008 from gstube, will they be a suitable replacement in this project?


Based on their characteristics, I am sure they should work perfectly Smile


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Fri Apr 15, 2011 7:07 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7252
Location: Pleasant Hill, California
pukkita wrote:
anatoliy, what was your experience with 6J52P? I have some bought in 2008 from gstube, will they be a suitable replacement in this project?


They are nice tubes, according to papers and other people who used them.
There were 2 types of them: low noise, and high power. Former were used in military equipment, latter lived short life in TV sets. I used to replace them by 6P15P in TV sets in order to restore color picture. I can assume, they were abused there, that's why used to die young. Some people claim they are often very microphonic, but I believe in such cases it was caused by HF oscillations.

I.e. I know them either as an end user, or as a theoretician, never used them in my own designs.

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