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[miklos]

Ok, so it's a EZ81 eq.

[Smokehouse Bob]

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.

[jim]

Here's a picture of my wedding last summer....

[coresta]

Tubes are fore ever best wishes , hoping that your WAF is as high as mine

[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.

OTL:


Schematic:


Jan E Veiset

[kopite]

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.

[TomWaits]

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.

[jane]

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:


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:



1. e4 e6, your move

Jan E Veiset

[Cassiel]

Hi Jane,

You're an artist!!!

[jane]

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