6N16 12x preamp srpp/cathode follower with printed circuit board design.

Koifarm · 09:50 PM

Hi folks,

Last month i designed/build a small preamp/buffer on a dutch forum. I like to share my experience also on this forum. I used the 6N16 miniature tube in a srpp/ cathode follewer setup. Further i designed a circuitboard and try to use cheap and simple parts for preamp and powersupply.

Some features :

Input voltage: from 10 to 1000mV
Amplification: 12x
Anode voltage rimple: <0.1mV
Output power on delay: 20 seconds.
Printed cicuit board: 100 x 160 mm (eurocard format)

Usable for Dac I/V conversion, CD player output buffer, Preamp, inputbuffer for Hypex class D amps.

Below see printdesign in the pdf file. Powersupply can be seperated from preamp.

http://www.ict-net.net/6n16print.pdf

Have fun with this schematic.

Ronny

revintage · 10th February 2012, 11:40 PM

Hey Koifarm,
Nice tube!
Why are you running the 6N16 at so low Ua and Ia? One also wonder why you have the CF at the output of the SRPP? The CF runs at about the same Ia as the first stage. If you want to go CF it would be better to use a CCS on top of the first 6N16, but then gain would almost double.

Koifarm · 10:09 AM

Hey Lars,

You are good in asking the right questions.
I shall try to give the right answers.

Normal a srpp is optimized for a curtain impedance. But this srpp has the lowest distorsion at a very high impedance. If you then like to drive lower impedance inputs you need a conversion, there the CS cums in.

About the low anode currents and voltages, i have treid a lot of voltages but at 140V( +/- 3 mA) this schematic sounded best with the lowest distorsion at a 10k input.

It replaced all my 6n6 buffers with the 6n16 i have build in the past. I use it now in my shanling cd t100 se for I/V conversion and as driverstage for unbufferred Hypex UCD amps.

Ronny

mace1337 · 11th February 2012, 11:42 AM

Hoi Koifarm,

Looks interesting, I happen to have some of these tubes laying around.

artosalo · 11th February 2012, 12:25 PM

Looks cool.
Do you have any extra pcb ?

mace1337 · 11th February 2012, 12:27 PM

Yes, if you can spare a PCB I'd be interested.

Koifarm · 11th February 2012, 06:30 PM

Sorry guys, i do not have any PCBs.

Mine i have made myself, this was my first after 30 years.
But maybe if there are more people interrested, someone can organice a groupbuy.

Ronny

ggetzoff · 18th February 2012, 04:46 AM

I'd be interested in a gb.

lechuck · 18th February 2012, 09:37 AM

Hi Ronny,

Where did you source the 6N16 tubes? They look like nice candidates for lamping my cd-player :-)

Groetjes,
Anthonie

Koifarm · 18th February 2012, 11:22 AM

Anthonie, i have bought them on ebay.

But if you need a view you can also look on marktplaats.

Ronny

10th February 2012, 05:55 PM	#1
Koifarm diyAudio Member Join Date: Aug 2005	6N16 12x preamp srpp/cathode follower with printed circuit board design. Hi folks, Last month i designed/build a small preamp/buffer on a dutch forum. I like to share my experience also on this forum. I used the 6N16 miniature tube in a srpp/ cathode follewer setup. Further i designed a circuitboard and try to use cheap and simple parts for preamp and powersupply. Some features : Input voltage: from 10 to 1000mV Amplification: 12x Anode voltage rimple: <0.1mV Output power on delay: 20 seconds. Printed cicuit board: 100 x 160 mm (eurocard format) Usable for Dac I/V conversion, CD player output buffer, Preamp, inputbuffer for Hypex class D amps. Below see printdesign in the pdf file. Powersupply can be seperated from preamp. http://www.ict-net.net/6n16print.pdf Have fun with this schematic. Ronny Last edited by Koifarm; 10th February 2012 at 09:50 PM.

10th February 2012, 11:40 PM	#2
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	Hey Koifarm, Nice tube! Why are you running the 6N16 at so low Ua and Ia? One also wonder why you have the CF at the output of the SRPP? The CF runs at about the same Ia as the first stage. If you want to go CF it would be better to use a CCS on top of the first 6N16, but then gain would almost double. __________________ Brgds Lars

11th February 2012, 09:59 AM	#3
Koifarm diyAudio Member Join Date: Aug 2005	Hey Lars, You are good in asking the right questions. I shall try to give the right answers. Normal a srpp is optimized for a curtain impedance. But this srpp has the lowest distorsion at a very high impedance. If you then like to drive lower impedance inputs you need a conversion, there the CS cums in. About the low anode currents and voltages, i have treid a lot of voltages but at 140V( +/- 3 mA) this schematic sounded best with the lowest distorsion at a 10k input. It replaced all my 6n6 buffers with the 6n16 i have build in the past. I use it now in my shanling cd t100 se for I/V conversion and as driverstage for unbufferred Hypex UCD amps. Ronny Last edited by Koifarm; 11th February 2012 at 10:09 AM.

18th February 2012, 04:46 AM	#8
ggetzoff diyAudio Member Join Date: Nov 2004 Location: Southwest	I'd be interested in a gb. __________________ Airline Pilot-If it's not Boeing I'm not going. "Brain as big as a planet..." {sic} Nelson Pass

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

11th February 2012, 11:42 AM	#4
mace1337 diyAudio Member Join Date: Aug 2005	Hoi Koifarm, Looks interesting, I happen to have some of these tubes laying around.

11th February 2012, 12:25 PM	#5
artosalo diyAudio Member Join Date: Feb 2010	Looks cool. Do you have any extra pcb ?

11th February 2012, 12:27 PM	#6
mace1337 diyAudio Member Join Date: Aug 2005	Yes, if you can spare a PCB I'd be interested.

11th February 2012, 06:30 PM	#7
Koifarm diyAudio Member Join Date: Aug 2005	Sorry guys, i do not have any PCBs. Mine i have made myself, this was my first after 30 years. But maybe if there are more people interrested, someone can organice a groupbuy. Ronny

18th February 2012, 09:37 AM	#9
lechuck diyAudio Member Join Date: Mar 2011 Location: Amsterdam	Hi Ronny, Where did you source the 6N16 tubes? They look like nice candidates for lamping my cd-player :-) Groetjes, Anthonie

18th February 2012, 11:22 AM	#10
Koifarm diyAudio Member Join Date: Aug 2005	Anthonie, i have bought them on ebay. But if you need a view you can also look on marktplaats. Ronny

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Cathode follower & SRPP q	Cobra2	Tubes / Valves	4	22nd February 2008 01:15 PM
Making a low distortion cathode follower preamp by brute force	bigwill	Solid State	0	12th May 2007 04:53 PM
Schematic please? SRPP with current source cathode follower	riotubes	Tubes / Valves	0	7th January 2007 05:18 PM
Question about direct coupling a anode follower into a cathode follower.	G	Tubes / Valves	45	29th July 2004 06:47 PM
srpp or m-follower?	GAK	Tubes / Valves	28	3rd September 2003 06:44 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read