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Old 28th August 2011, 05:36 AM   #1
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Default Headphone Amp

Looking at a quick side project before i build the big amp...

Goals:
3-5W OPT
Balanced Input
Must be usable as preamp

Must be able to drive low impedance headphones...
Currently using Sony MDRV700 ( 24 Ohms )

Possible output tubes
6080 - 6C33C

Last edited by Adrculda; 28th August 2011 at 06:00 AM.
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Old 28th August 2011, 11:15 AM   #2
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An ECC99 as an SRPP at about 15mA standing current driving a Sowter 8665 headphone transformer would do the job. A Sowter 10K:10K bridging transformer on the input, such as the 3293, will give you your balanced input.

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Ian
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Old 28th August 2011, 07:17 PM   #3
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Currently listening to a 6U10 or 6ac10's-Mosfet hybrid headphone amp.
6u10 is an input gain stage and SRPP second stage with a Mosfet follow output. I did allow for feedback from the output to the input of the SRPP stage. The output is cap coupled.
I was looking for a simple, inexpensive amp that could use what stuff I had on hand.
The tubes will be visible though a window in the front of the amp, the idea is to use 304 mirror finish to make a divider to reflect the light forward and hide the circuitry. I used foil glued to cardboard for a mock up...
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Old 28th August 2011, 11:47 PM   #4
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Quote:
Originally Posted by ruffrecords View Post
An ECC99 as an SRPP at about 15mA standing current driving a Sowter 8665 headphone transformer would do the job. A Sowter 10K:10K bridging transformer on the input, such as the 3293, will give you your balanced input.
Looking to stay away from transformers unless its for power...

Quote:
Originally Posted by roline View Post
Currently listening to a 6U10 or 6ac10's-Mosfet hybrid headphone amp.
6u10 is an input gain stage and SRPP second stage with a Mosfet follow output. I did allow for feedback from the output to the input of the SRPP stage. The output is cap coupled.
Also Looking to stay away from SS components as well...
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Old 29th August 2011, 02:59 AM   #5
roline is offline roline  United States
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Mosfet having the same trans-conductance, "voltage in, current out" as a tube and in a Class A follower application has the advantage of low output impedance over a tube....
I tried other ideas, came back to this one. The 6U10 is not the most ideal low voltage tube, but the results are impressive. Other ideas included 5 watt tube PP and SE circuits, but the transformers are very expen$ive for the bandwidth.
You might try a SRPP with a set of GU50's or KT88's
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Old 29th August 2011, 03:07 AM   #6
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I'm looking at something similar to the Little Dot MK VI or MK VIII...
Sadly i cant find the diagrams :/

Even though the MK VI is more suited for my headphones

Last edited by Adrculda; 29th August 2011 at 03:10 AM.
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Old 29th August 2011, 03:12 AM   #7
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Quote:
Originally Posted by Adrculda View Post
Also Looking to stay away from SS components as well...
What about staying away from very non-linear power supply regulating tubes?
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Old 29th August 2011, 03:28 AM   #8
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Quote:
Originally Posted by Wavebourn View Post
What about staying away from very non-linear power supply regulating tubes?
But there are improved tube regulated power supplies
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Old 29th August 2011, 03:47 AM   #9
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Quote:
Originally Posted by Adrculda View Post
But there are improved tube regulated power supplies
I would personally prefer 4P1L output tube with nice transformer, powered by MOSFET voltage regulator. Can't think of anything better for headphones.
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Old 29th August 2011, 04:05 AM   #10
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What about 6C33C ?
They are low voltage and capable of delivering high current in PP OTL
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