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Old 5th December 2006, 03:28 AM   #1371
miklos is offline miklos  Canada
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Ok, so it's a EZ81 eq.
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Old 5th December 2006, 11:20 AM   #1372
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Yes, a simple rec. tube that's easily available. Balance are 6V6GT and a pair of 6eu7. Again, cheap and easy to roll tubes. I have another version with 12AX7s and a choke. It is said to sound as good or much better.
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Old 6th December 2006, 08:17 AM   #1373
jim is offline jim  Belgium
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Default Wedding Rings

Here's a picture of my wedding last summer....
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Old 6th December 2006, 09:48 AM   #1374
coresta is offline coresta  France
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Tubes are fore ever best wishes , hoping that your WAF is as high as mine
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Old 7th December 2006, 04:27 PM   #1375
jane is offline jane  Norway
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Default OTL headphone amp.

OTL headphone amplifier based on two SRPP stages (E80CC and ECC99).
Max output level is 8.4V rms into 220 ohm.
Distortion is 0.15% THD @ 1V rms.

OTL:
Click the image to open in full size.

Schematic:
Click the image to open in full size.

Jan E Veiset
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Old 8th December 2006, 03:07 AM   #1376
kopite is offline kopite  New Zealand
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Hi Jan,

Thank you for posting your latest project, I enjoy your circuits. Can you post the psu please and what is the value of the two resistors on the output?
Many thanks,

Phil.
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Old 8th December 2006, 03:16 AM   #1377
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Default Re: OTL headphone amp.

Quote:
Originally posted by jane
OTL headphone amplifier based on two SRPP stages (E80CC and ECC99).
Max output level is 8.4V rms into 220 ohm.
Distortion is 0.15% THD @ 1V rms.
Jan E Veiset
Your Knight takes my Bishop! Nice!


Cheers,

Shawn.

BTW this feed from the DIY is one of the coolest things that ends up in my mail box. I love the "Art" that people pour into Valve designs.
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Old 8th December 2006, 07:41 AM   #1378
jane is offline jane  Norway
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Here is what the power supply looked like on my drawing board. I did not follow the schematic 100%, the diodes (1N4004) that elevate the 7812 output voltage from 12V to 12.6V are left out and each 7812 feeds the filaments for one channel, etc.

OTL Power supply:
Click the image to open in full size.

The output serial resistors are 120 ohms. That will reduce the power into low impedance headsets but also increase the S/N. When using a 39 ohm load, max Vout is ~1.5Vrms, which is more than enough to drive low impedance, high efficient Grados, for example.

A picture from the test bench:
Click the image to open in full size.


1. e4 e6, your move

Jan E Veiset
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Old 8th December 2006, 03:11 PM   #1379
Cassiel is offline Cassiel  Libya
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Hi Jane,

You're an artist!!!
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Old 8th December 2006, 04:52 PM   #1380
jane is offline jane  Norway
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Quote:
Originally posted by stalker
You're an artist!!!
I wish I where. The chassis work/painting is done by Lloyd Peppard, Canada.

BR,
Jan E Veiset
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