[2359glenn]

I did burn in the amp for 48 hours before I shipped it. Probably needs to be burned in
with the tubes you are going to use.

 

[rnros]

Congrats on the new amp. Pls post some pics when convenient. Amp porn is always welcome.

(and real men don't settle for anything less than a 300B ).

Thanks. Will get around to pics.
300B you say? Maybe, someday.

 

[rnros]

I did burn in the amp for 48 hours before I shipped it. Probably needs to be burned in
with the tubes you are going to use.

Assumed you had put some burn on the amp. Thanks for that.
And yes, on needing tube and amp burn. Sure, only selecting quiet tubes, but some are brand new.
That's why it's so impressive as it is, there are no serious or annoying issues here, really hard to take the headphones off.
Expecting only more good things at 100 and 200 hrs.

 

[whirlwind]

Just a few hours into the GOTL, and very impressed, and very happy... : )

Dynamic, expansive, detailed, very clean, and very quiet. And just getting started!
Thank you, Glenn.

Congrats.

Enjoy your music.

 

[whirlwind]

I swapped amps with my son for a few days, he wanted to listen to the EL3N amp.

GOTL and HD800 synergize wonderfully. It has been awhile since I have heard the OTL






Joe Bonamassa "Live From Nowhere In Particular" sounds beautiful!

 

[ru4music]

I swapped amps with my son for a few days, he wanted to listen to the EL3N amp.

GOTL and HD800 synergize wonderfully. It has been awhile since I have heard the OTL






Joe Bonamassa "Live From Nowhere In Particular" sounds beautiful!

Yes, an OTL is generally around 300 ohms output impedance which is a great match for the HD800's 300 to 650 ohm impedance curve. Maximum power transfer occurs at equal (matched) impedance, that's why your planar headphones ( guessing ~20 ohm impedance) may sound better on your GEL3N which is configured around 28 - 30 ohm output impedance ( if memory serves me correct from my conversations with @2359glenn .)

 

[whirlwind]

Yes, an OTL is generally around 300 ohms output impedance which is a great match for the HD800's 300 to 650 ohm impedance curve. Maximum power transfer occurs at equal (matched) impedance, that's why your planar headphones ( guessing ~20 ohm impedance) may sound better on your GEL3N which is configured around 28 - 30 ohm output impedance ( if memory serves me correct from my conversations with @2359glenn .)

Yeah, my planars are 50 ohm....and they do sound best on my EL3N amp....not bad on Glenns OTL amp though.

 

[ru4music]

I don't have my new GEL3N yet to provide any new-amp porn, so I thought I would provide some NOS-tube porn that is anticipating a new home soon:

 

[Oskari]

Great tube porn!

 

[whirlwind]

I don't have my new GEL3N yet to provide any new-amp porn, so I thought I would provide some NOS-tube porn that is anticipating a new home soon:

Nice, are those Raytheon tubes 5CU4 by any chance ?

I just received one today.

 

[rnros]

Yes, an OTL is generally around 300 ohms output impedance which is a great match for the HD800's 300 to 650 ohm impedance curve. Maximum power transfer occurs at equal (matched) impedance, that's why your planar headphones ( guessing ~20 ohm impedance) may sound better on your GEL3N which is configured around 28 - 30 ohm output impedance ( if memory serves me correct from my conversations with @2359glenn .)

And yet, on the GOTL, my MrSpeakers Aeons (~15 Ohm) sound much better than my Beyer T1.2 (600 Ohm).
(Not just better than T1.2, they sound very, very good.)
I am aware of the typical guidance offered for impedance matching, but it doesn't always hold true.
That's a comparison made with the 6336B, the T1.2 actually showed a little noise, dead quiet for the Aeon.
The Aeons were also good with some of the other power tubes I tried, most recently 4 6BX7s.
(The Aeons are planar.)

 

[2359glenn]

Most OTL amps are cathode follower output my OTL is SRPP output.
I used to be a RADAR tech and they used SRPP to drive the 52 ohm line outputs for video and clock.
These were long runs the RADAR unit can be far away from the screen.
with tubes like 6AS7 the output impedance is much lower then 50 ohms.
That is why this OTL can drive low impedance planar phones when most OTLs cant properly do it.

 

[rnros]

Nice. Yes! What Glenn said.

I'll still believe you have some magic, but... What is SRPP?

Didn't expect these graphite plate 6336Bs with 5A heaters to be so good.
Expected them to be power monsters, but perhaps lacking in micro detail/dynamics.
Not so, not giving up anything in the finesse department.
Beautiful image projection, and quiet! Does require additional warm-up time.

 

[Rossliew]

I can attest that Grado's and the GOTL sound fabulous !

 

[ru4music]

Nice, are those Raytheon tubes 5CU4 by any chance ?

I just received one today.

Yes, you must have received the same @2359glenn alert... looking forward to your comparison in the GEL3N vs. other rect. tubes.