I could probably be into trying one of those with my orthos. See if it can unseat the DynaFET...


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1 hour ago, Pars said:

I could probably be into trying one of those with my orthos. See if it can unseat the DynaFET...


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I have my doubts about that ... However, the interesting thing (for me) is to try it.

anyone have a pair of these boards?

First, thanks to Dr. Gilmore and Soren!

My amp is working and everything is OK. It's perfect with low impedance and miserable sensitivity headphones. 

B: +/- 29Vdc

~2.1/50=41mA (L) 43.2mA (R)

~2.2/562=3.7mA (L) 3.9mA (R) 

Voltages are a bit lower than Congo5 but I think it´s correct.

I start working on the chasis now. I´ll install a switch to select the gain as I did in the SquareWave.

P.S. I know I have to put a photo to fulfill my part of the deal. I'll place it this weekend. ? 

 

 

Edited April 5, 20197 yr by jose

After 1 hour voltage on 562r fall to 1.9Vdc.

This was completed an hour ago.  It worked though I did not do any measurement.  I tried it with my only planar Hifiman HE6.  The volume was a dummy.  I used a preamp.  I could not afford a decent volume control for individual headamps.

Edited April 15, 20197 yr by samsie

Could anyone repost the schematics? Have never been able to visit gilmore's website...

Find "currentsource" here

I´m working on a F2J. It will be very interesting. I had not had any experience with this type of amplifier until now.

I don´t think that it´s a "definitive amplifier" (I'm in love with the balanced Dynahi) but as an alternative it's not bad for the planars.

 

9 minutes ago, jose said:

Find "currentsource" here

I´m working on a F2J. It will be very interesting. I had not had any experience with this type of amplifier until now.

I don´t think that it´s a "definitive amplifier" (I'm in love with the balanced Dynahi) but as an alternative it's not bad for the planars.

 

Thank you very much sir, thats one big treasure of schematics

Just now, A_Zero said:

Thank you very much sir, thats one big treasure of schematics

You have to thank Dr. Gilmore and everyone who has worked on it.

On 2/29/2016 at 10:39 AM, wink said:

More realistically 2.27/35 = 0.0649A = 64.9mA.

 

Please guys, could you explain this to me?

I understand that 2.27volt. goes through 50r. Why replace it with the impedance of the headset?

Gain selector is quite a hit. I'm enjoying it enough!!! 

F2J and the KG Transconductance Amp have a very similar behavior; they shine with impedances between 30r to 75r from there they lose a lot.

I forget to hang some photos of this amplifier.

Sorry, I did not have any GRLV at that time ready.

 

 

I came across this amp and I'm wondering if this can run a pair of fullrange fostex horns (96db and 8 ohms min).  Apparently they thrive being current driven and aside from Pass F1/2, pickings are really slim. As my Chord Mojo2 can run them quite appreciably loud (from a battery no less). I'm looking at headphone amps.. Any advice appreciated!