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Old 31st August 2008, 09:45 PM   #1
aurche is offline aurche  Bulgaria
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Default 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!
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Old 1st September 2008, 08:59 AM   #2
aurche is offline aurche  Bulgaria
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I was thinking 6S45P
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Old 1st September 2008, 10:27 AM   #3
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Yours headfones - low impedance /30 - 60 ohm/ or higt /200-300-500 ohm/?? It's very important!!!
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Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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Old 1st September 2008, 06:20 PM   #4
aurche is offline aurche  Bulgaria
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Nikola, 55Ohms.
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Old 1st September 2008, 07:43 PM   #5
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http://headwize.com/projects/index.htm#tubes
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Old 2nd September 2008, 07:38 AM   #6
Akita is offline Akita  Malaysia
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You can try 6as7. Its a nice tube for headphone amp too
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Old 2nd September 2008, 10:28 AM   #7
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6H30C - /Russia/ lake pre-amp, and 6H13C/Russia/ lake output
kathod.
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Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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Old 2nd September 2008, 09:19 PM   #8
Gordy is offline Gordy  United Kingdom
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6S45 = 6C45 ?

Simple 6C45 power amp here:
http://www.paeng-design.com/devices_frame.htm
(in section: High 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. : )
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Old 3rd September 2008, 04:53 PM   #9
regal is offline regal  United States
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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.
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Old 21st February 2009, 11:23 AM   #10
aurche is offline aurche  Bulgaria
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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?
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