[T-Bone]

Hi Hugh,

Have you ever tried using your TLP as a stand alone headphone amp? What changes (component values) would need to be made to accomplish this? Yes, I still have the same one you sold me several years ago:-)

BTW, I am certain you will find success on your commercial endeavor. As you know luck did not get you where you are today. Dedication and many hours of hard work did.   

Thanks,
Brad Kizer

[AKSA]

Thanks Brad,

Great to hear from you after all this time!!  I trust you are well and firing on all cylinders??

The TLP has an output impedance around 130 ohms, which is too high to drive most headphones.

Headphones of 2k impedance or higher are OK, but no lower.

You can put a chip opamp on the output to drive headphones, however, something like the 2134 set up for unity gain.  If you are interested in this idea, Brad, email me privately and I'd be delighted to give you more details!

Cheers,

Hugh

[T-Bone]

Hi Hugh,

I am doing well and thank you for asking:-) I'll email you for the details...

Thanks,
Brad Kizer

[Seano]

Did anyone just see perhaps another new Aspen product just appear under our noses?

[AKSA]

Seano,

You have just uncovered Victoria's secret.......

Hugh

[kyrill]

hi

is cross feed considered well? Nothing more unpleasant in the long run then to listen to perfect stereo on a headphone. Listening to a good stereo setup w. normal speakers only works when both ears hear both speakers.
This cannot be done with headphones for obvious reasons, unless cross feed by design is implemented. How much db of the R earphone in the L earphone and vice versa is a masters secret, and tells how good the master is

a good pws is critical i suppose and will be expensive. So for marketing reasons an easy replaceable  long life battery may do, unless tube(s) enter the arena,

[AKSA]

Hi Kyrill,

I have not yet considered crossfeed for headphone amps.  This is a refinement which, indeed, bears further investigation.

As a general rule mixing of L and R should be performed either with resistors or transformers, the latter being much more expensive.  The mixing circuit should have a buffer feed and a high impedance input to follow, so that all controls act predictably.  This does complicate things somewhat.

Headwise has some very good circuits but I have not seen mixing circuits used.

Later......

Cheers,

Hugh

[bluesky]

Hi Hugh

I, for one, would be very interested in this idea.  I still have my TLP and hope to acquire a GK-1 from a good friend soon.

I'd be happy to build some of your component changes to give you feedback on different options for the TLP to help with any development ideas you may have.

Cheers

Bluesky

[AKSA]

Hi Ian,

NO!!  NOT YET!!! PLEASE!!!

I have to recoup some absurd R&D costs!

Hugh