[Nigel]

How can you say it's not single-ended?

It is definitely single-ended Class-A The circuit is basically
an op-amp feeding an emitter follower. The op-amp provides the voltage gain
and the emitter follower increases the output current capabilities. A
constant current source provides the load for the emitter follower.

Nigel

 

[Squalish]

Quote:

Originally posted by buggalugs Don't forget to visit wnaudio.com if you are UK residents. For a commensurate price as the Chiarra kit you get audiophile caps and resistors, top range chips and a mouth watering stepped attenuator - on paper this looks a much tastier package. Oh and by the way how does the guy at Hart justify calling this a "single ended" amp when there is a dual op amp and dual supply at the centre of his kit? - perhaps it's the purist in me but it's not my understanding of single endedness.

"Single ended" refers to classification of the circuit design, rather than how many channels each unit has.

 

[wordsworth]

Quote:

Originally posted by buggalugs Don't forget to visit wnaudio.com if you are UK residents. For a commensurate price as the Chiarra kit you get audiophile caps and resistors, top range chips and a mouth watering stepped attenuator - on paper this looks a much tastier package.

White Noise Headphone amplifier

I assume that this spec is good:

Quote:

The audiophile grade headphone amplifier is supplied with OPA627, Welwyn RC55Y resistors, polypropylene capacitors, and OSCON electrolytics.

Its certainly a good price:
Headphone amplifier, standard version, including A&T plug top psu
Kit: £ 75 Assembled and Tested: £105

Headphone amplifier, audiophile version, including A&T plug top psu
Kit: £110 Assembled and Tested: £140

Wordsworth

 

[london luke]

Pinkie

For my "One box project" would you reccomend I go this route or the modded "Xcan v2"??

Cheers


Luke

 

[AIM9x]

I wouldn't mind putting this amp together, then maybe later on, fitting it all into one box, with a DACT,

I guess I'll pick me up a quality soldering iron and get to practicing asap.

 

[london luke]

Sounds good after a few hours.... 20 days to go....

 

[wordsworth]

Luke I am sure you won't be disappointed and it does get better the more it is used. Since getting mine I haven't bought anything else and am now happy with what I have. By the way i found the amp doesn't work too well with low independance headphones like the a1000 or ER4P though it works great with the ER4S (ER4P with 'S' adapter).

Wordsworth

 

[london luke]

Wordsworth


I am using HD600's and jecklin floats.

reccon the 600's should be fine.


Started to right a long post about the whole project and it just disapeared!!!

still cannot believe the size of this funky opamp!!! its so small


watch this space

 

[wordsworth]

I manly use the HD580's with mine and it sounds great. Reading the details of your amp makes me wonder how different they sound, there is no doubt that changing the op amp effects the sound greatly with these amp so yours having a hightly rated op amp should sound very good.

Wordsworth

 

[PinkFloyd]

Tweaks and tips section uploaded: http://freespace.virgin.net/borders....insleyhood.htm

Will be filling this section up over the next few weeks so keep checking back

 

[chrisjsmith11]

I'm adding a post to this ancient thread - bringing it back from the dead in 2021.

I have this amp, bought it used for not much about a year ago, and it's great.
It was my first foray into a decent head amp.
Getting more into headphones and head-amps, I am now curious what will significantly better it.
Would be interesting to hear from past owners where they went next, and what perceivable gains they got (over the last 17 years (!!).

 

[tomb]

I'm adding a post to this ancient thread - bringing it back from the dead in 2021.

I have this amp, bought it used for not much about a year ago, and it's great.
It was my first foray into a decent head amp.
Getting more into headphones and head-amps, I am now curious what will significantly better it.
Would be interesting to hear from past owners where they went next, and what perceivable gains they got (over the last 17 years (!!).

That's great that you're happy with it and thought to resurrect this thread, but don't you think there's something better by now (18 years)?

 

[chrisjsmith11]

That's great that you're happy with it and thought to resurrect this thread, but don't you think there's something better by now (18 years)?

do you really believe amplifier technology has moved on in the last 18 years? What significant improvements are you referring to?

 

[tomb]

do you really believe amplifier technology has moved on in the last 18 years? What significant improvements are you referring to?

Most of what PinkFloyd tweaked and modded is old hat. He'd probably be the first to admit that, with what he worked on back in 2003. He was later banned or left, I forget which - not that I disagreed with him at the time, just that he left and never came back.

Anyway, until about 2010, you mostly had to build a truly fine headphone amp to have one. What was available at the time was either rudimentary opamp and tube circuits, or nothing at all. There wasn't even a DAC available, either. The world has changed since then.

Sorry, but I'm not biting on your question more than that. Read a bit, do some studying, look at the current mfrs today and what they're building.