The Dutch Guy made a valid point, in that the Headphone Amplifier should protect the Headphones in the event of malfunction of the Amplifier. Had the Amplifier the poster was using employed even rudimentary monitoring of the output for signs of excessive DC voltage and the clamped the output to...

Power Input is Via the 2.1 mm Power jack. The external AC adaptor should output 24 Volts DC/150 or more mA. with center pin of the jack POS.

No the new Batt will not fit LISA III

Great to see you got it together and stable. Is the mini phone jack you used insulated?

The OPA637 is not unity gain stable,Thus you can not use a cap around the feedback loop or the Op-Amp. This trick will work with the OPA627 because it is unity gain stable. The cap puts the opamp into unity gain at high frequencies.

Change the OPA 637 to OPA 627 note if stability returns if so you can continue to use the 627 or redo board layout. The pop upon start up is typical of the 627/637 devices . Also higher gain setting and larger value Op Amp feedback resistor , say maybe 1.5 megs. Also the value of resistors going...

Hello, I thought this would be a great time to reflect back into our past and look at one of My First and favorite Headwize, Head-fi Contributor. I for one will surly miss him.

Quote:   Yes that demo was to show the effect of the reduction in bass at normal listening levels SEE however the L3 uses only Bass boost and is in no way attempting to recreate this curve and thus has no effect above about 300 Hz

Quote: I have had great luck with both LISA III and L3 with THIS low cost charger, yes the Defects on the Wood case that are causing Plug to not fully seat is being looked into at this moment. Note Due to the Close spacing of the jacks large Dia. Audiophile Plugs will not fit so the High...

no the bass knob at full CCW is Flat not reduced, the bass knob only boosts not cut as conventionial bass controls. the boost turnover is at about 100 Hz. the max boost is about 7 to 10 dB depending upon the gain switch setting

Both of these will work yes, However I have been using this low cost AC Adaptor on Both LISA III as well as the L3 Quote:  

I am not going to attend myself, Brad is and will have the New valvecode All cascode Tube headphone Amp as well as the L3 Portable. I think he could use some help with Sources and Headphones if anyone can help TIA.

I personaly responded to Joe fan a while ago so tell me whats the prob did not every one get what they wanted????????????????????

Quote: Originally Posted by TimG Thanks for the response, It has OPA 627AP's on all three channels. The buffers is the Laroccc Audio Triad board setup. Tim Try adjusting the bias higher in addition to the checks Recommended in previous posts. BTW the PPA V2 Discrete Buffer...

OOps dup