What tube to use.

aurche · 31st August 2008, 08:45 PM

I would like to build an headphone amplifier. The concept that i have made up is: OTL, Ultra Fast Diode Rectifier, Relatively low voltage, One Tube channel. What tube would you suggest i use?
And mind that the output impedance must be 50 or below!

aurche · 1st September 2008, 07:59 AM

I was thinking 6S45P

azazello · 1st September 2008, 09:27 AM

Yours headfones - low impedance /30 - 60 ohm/ or higt /200-300-500 ohm/?? It's very important!!!

aurche · 1st September 2008, 05:20 PM

Nikola, 55Ohms.

astouffer · 1st September 2008, 06:43 PM

http://headwize.com/projects/index.htm#tubes

Akita · 2nd September 2008, 06:38 AM

You can try 6as7. Its a nice tube for headphone amp too

azazello · 2nd September 2008, 09:28 AM

6H30C - /Russia/ lake pre-amp, and 6H13C/Russia/ lake output
kathod.

Gordy · 2nd September 2008, 08:19 PM

6S45 = 6C45 ?

Simple 6C45 power amp here:
http://www.paeng-design.com/devices_frame.htm
(in section: High ó tubes, Part 111)

Adapt to headphone by changing transformer ratio?

6C45 datasheet suggests limited input swing / bias, so will need attenuator at input if using 2V output from CD player.

Anecdotal evidence suggests 6C45 oscillates easily, so use well regulated supply and grid stopper resistors.

More info here:
http://www.vt52.com/info/measure/6s45/6s45.html
...and also in projects section of the site.

Good luck. : )

regal · 3rd September 2008, 03:53 PM

I don't think you wil be able to power 55 ohm headphones with a single tube OTL. You will need push-pull with feedback to be output transformerless. Or you could use a solid state buffer with a single tube gain stage.

aurche · 21st February 2009, 10:23 AM

I try to escape from SS. Eventually only SS rectifier. I gues what i want i can't find. My new idea is a OTL with 6S19P as output tube, and 6N23P or 6N24P as input tube. Can someone give me a scheme of such an amp?

31st August 2008, 08:45 PM	#1
aurche diyAudio Member Join Date: Apr 2008	What tube to use. I would like to build an headphone amplifier. The concept that i have made up is: OTL, Ultra Fast Diode Rectifier, Relatively low voltage, One Tube channel. What tube would you suggest i use? And mind that the output impedance must be 50 or below! __________________ Stefan Jordanoff

1st September 2008, 07:59 AM	#2
aurche diyAudio Member Join Date: Apr 2008	I was thinking 6S45P __________________ Stefan Jordanoff

1st September 2008, 05:20 PM	#4
aurche diyAudio Member Join Date: Apr 2008	Nikola, 55Ohms. __________________ Stefan Jordanoff

21st February 2009, 10:23 AM	#10
aurche diyAudio Member Join Date: Apr 2008	I try to escape from SS. Eventually only SS rectifier. I gues what i want i can't find. My new idea is a OTL with 6S19P as output tube, and 6N23P or 6N24P as input tube. Can someone give me a scheme of such an amp? __________________ Stefan Jordanoff

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

1st September 2008, 09:27 AM	#3
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	Yours headfones - low impedance /30 - 60 ohm/ or higt /200-300-500 ohm/?? It's very important!!!

1st September 2008, 06:43 PM	#5
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	http://headwize.com/projects/index.htm#tubes

2nd September 2008, 06:38 AM	#6
Akita diyAudio Member Join Date: Dec 2006 Location: Kuala Lumpur	You can try 6as7. Its a nice tube for headphone amp too

2nd September 2008, 09:28 AM	#7
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	6H30C - /Russia/ lake pre-amp, and 6H13C/Russia/ lake output kathod.

2nd September 2008, 08:19 PM	#8
Gordy diyAudio Member Join Date: Nov 2006	6S45 = 6C45 ? Simple 6C45 power amp here: http://www.paeng-design.com/devices_frame.htm (in section: High ó tubes, Part 111) Adapt to headphone by changing transformer ratio? 6C45 datasheet suggests limited input swing / bias, so will need attenuator at input if using 2V output from CD player. Anecdotal evidence suggests 6C45 oscillates easily, so use well regulated supply and grid stopper resistors. More info here: http://www.vt52.com/info/measure/6s45/6s45.html ...and also in projects section of the site. Good luck. : )

3rd September 2008, 03:53 PM	#9
regal diyAudio Member Join Date: Jan 2004 Location: MD	I don't think you wil be able to power 55 ohm headphones with a single tube OTL. You will need push-pull with feedback to be output transformerless. Or you could use a solid state buffer with a single tube gain stage.

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
FS tube tuner, Active filter kit, tube amp, amp3	Josephjcole	Swap Meet	9	20th July 2007 04:05 PM
SS or tube voltage amplifying stages in an amp with tube output?	ray_moth	Tubes / Valves	14	4th July 2007 03:09 AM
need diy tube preamp (line-stage) recommendation and general tube advice	Musiclover4	Tubes / Valves	15	24th November 2005 01:19 AM
tube driving the same tube - whats the collective word?	zobsky	Tubes / Valves	3	13th June 2005 06:47 AM

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