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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Mon Mar 07, 2011 12:41 am 
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Joined: Mon Mar 22, 2010 1:10 am
Posts: 238
thanks. refered to the thread already.


 
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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Mon Mar 07, 2011 11:16 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7245
Location: Pleasant Hill, California
I had 7 4P1L tubes, bought from 2 different e-pay sellers from Ukraine. Measured all of them on -17V on first grid, 220V on anode. Idle currents are:


1. Feb 1966 50 mA
2. March 1976 42 mA
3. Feb 1966 45 mA
4. Feb 1966 44 mA
5. Feb 1966 41 mA
6. Feb 1966 43 mA
7. March 1976 50 mA

That means, differences in idle current on the same voltages are less than +/-10 percent.

I did not measure yet how well it performs, but Diana Krall sings very well, very real soundstage, I hear clear details. Obviously, output power is 5W per channel now, because when I connect the same 8 Ohm speakers to 16 Ohm taps, I see the same level on indicators.

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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Mon Mar 07, 2011 2:45 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7245
Location: Pleasant Hill, California
I can't stop listening, to measure... Just listening, and listening, and listening...

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-7: 4P1L Single Ended Amplifier Design
PostPosted: Mon Mar 07, 2011 3:36 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7245
Location: Pleasant Hill, California
Ok, since power supply and both channels of power amp are running, I am going to add a remote controlled volume control and input selector.

Ideally, I would use ladder type attenuators, but currently I have only remote control kit with motorized potentiometer.

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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Tue Mar 08, 2011 12:42 am 
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Joined: Mon Mar 22, 2010 1:10 am
Posts: 238
woohoo.... i think I will be loving the 4P1L amp too by the way you described it... seems to be very musical Smile

One of my friends said, why bother about the measurements, as long as you love the sound!! Hehehe...

As mentioned in one of your previous thread/posts, measurements aren't everything as there is a psychoacoustic component to it all.


 
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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Tue Mar 08, 2011 2:15 am 
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Posts: 238
As I understand, 6PXXX series would be output tubes with probably higher current capabilities. 6JXXX series are labeled as sharp cut off.

Will there be any difference in using 6PXXX series pentodes versus using 6JXXX series pentodes in driver stages?

I have limited access to tubes and was thinking of replacing some of the 6JXXX series of tubes with 6PXXX series in the schemes you have designed.


 
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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Wed Mar 09, 2011 12:31 pm 
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Joined: Wed Oct 01, 2008 9:14 am
Posts: 41
Location: Denmark
What socket does the 4P1L have? Judging from the photos I have seen it doesn't look like the original one on the RL4.2P6. 8 pin loctal?


 
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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Wed Mar 09, 2011 1:22 pm 
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Posts: 238
Knarf wrote:
8 pin loctal?



yup


 
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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Wed Mar 09, 2011 6:36 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7245
Location: Pleasant Hill, California
J (Ж) means pentode, K means remote cut-off pentode, P (П) means output pentode. However, sometimes pentodes with P an J overlap each other by power, like 6J52P is more powerful pentode than output pentode 1P2B

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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Wed Mar 09, 2011 9:17 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
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Location: Pleasant Hill, California
Filament power supply for the phono stage has to be clean and separated, since 6S17K-V tubes have filaments connected to cathodes.


Attachments:
filstab.jpg
filstab.jpg [ 75.46 KB | Viewed 4183 times ]

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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Thu Mar 10, 2011 4:31 am 
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wavebourn wrote:
J (Ж) means pentode, K means remote cut-off pentode, P (П) means output pentode. However, sometimes pentodes with P an J overlap each other by power, like 6J52P is more powerful pentode than output pentode 1P2B


So that means there should be no problem to interchange the different groups of pentodes as long they fulfil our needs and voltage schemes? As I have quite a number of 6P15P and 6P14P, these will be my main pentodes that I will use, hardly can find any of the frame grid pentodes that you suggested even on epay. Even if can be found, prices are reaching the sky.
K series would not be suitable as they are remote cut off so would be non-linear, if I understand correctly.


 
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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Thu Mar 10, 2011 3:01 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7245
Location: Pleasant Hill, California
You should look at plate curves and decide weather they are good on currents you want, or not. Also, power pentodes may have higher microphonics.

By the way, here is a PS I made for 6S17K filaments attached. They were designed, by the way, to generate microwave power, but work like a charm in microphone preamps.


Attachments:
filament_shunt_reg.jpg
filament_shunt_reg.jpg [ 175.74 KB | Viewed 3842 times ]

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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-7: 4P1L Single Ended Amplifier Design
PostPosted: Thu Mar 10, 2011 7:12 pm 
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filaments and cathode of 6S17K-V share the same pins, so means that every tube should have their own power supply.. am i right?


 
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 Post subject: Re: Gubernator-7: 4P1L Single Ended Amplifier Design
PostPosted: Thu Mar 10, 2011 10:02 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7245
Location: Pleasant Hill, California
quikie22 wrote:
filaments and cathode of 6S17K-V share the same pins, so means that every tube should have their own power supply.. am i right?


I will have 2 of them only, close to each other, so no need for separate power supplies. Cathodes will be grounded, and bias obtained through grid leak resistors: this tubes have strong cathode emission and microscopic distance between very dense grid and cathode.

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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-7: 4P1L Single Ended Amplifier Design
PostPosted: Fri Mar 11, 2011 12:26 am 
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Joined: Mon Mar 22, 2010 1:10 am
Posts: 238
wavebourn wrote:
quikie22 wrote:
filaments and cathode of 6S17K-V share the same pins, so means that every tube should have their own power supply.. am i right?


I will have 2 of them only, close to each other, so no need for separate power supplies. Cathodes will be grounded, and bias obtained through grid leak resistors: this tubes have strong cathode emission and microscopic distance between very dense grid and cathode.



Grounded cathode design!!... That will simplify the filament connections definitely.

What about the RIAA correction? How would we calculate the values if using 6S17K?


 
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