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

Quote: Originally Posted by RockinCannoisseur sweet thanks ill be needing to pick one up No, A DC Power cable is Included with the LLP, however the AC IEC mains Cord set is not included with the LLP because this is Area dependent and can be obtained Locally.

Quote: Originally Posted by RockinCannoisseur "so you use the LLP? do u know what type of output connector it takes and the type on input connector that the standard takes from a power supply." thanks the LISA III std,LISA XP,LISA RS all are connected with a 2.1 MM Coax power...

Quote: Originally Posted by purk I hope it is still alive as I love my larrocco Headcode DM. Glad you are enjoying your Amp. The Portable Headcode, is not dead, it is just slow moving. Since the PORTACODE is based upon, the Home Headcode TRIAD is making the Home Headcode in DM...

THE INPUT TUBES of the VALVECODE are Dual TRIODE type 6SN7, 6SN7GT, 6SN7GTA. Any 6SN7 compatible tube will work in the VALVECODE Input position. The below operating points are based upon a unregulated B+ Voltage of 391 volts at the Plate load resistor of the input tube. The Bottom section of the...

This is free is intended to test sound cards however can be used to test amp by Juggling the levels so the output of the amp is the required output voltage IIRC is about 1 volt RMS

Ask Jack if the ECC85 or the 6BZ7 will work in your amp. I like both of these as well or better than the 6DJ8/6922.

I would check the grounds on the RCA jacks the PC Board to case and Volume control to case these are known Larry issues with everything he made. Sorry, for your Inconvenience with your PR II However, my time is limited and many of Larry’s Builds have issues. I would think a DIY type should be...

You might Consider the Luxman SQ-100 Or for more power the rogue Audio Cronus

It is somewhat disappointing to have ones equipment Malfunction just when you least likely to want a breakdown. About 60 Years ago Mr. Murphy Assured humanity that what can go wrong will go wrong. If it were not enough to have Murphy to worry about we have the all looming never predictable Force...

Francis are you referring to the Sophia Electric > 274B/274A< Rigid & Mesh Plate Tubes? Yes Sir they do look like some mighty fine bottles. I believe they would work in the Valvecode based upon the data on their site, however they caution about having a lot of capacitance after the rectifier...