[SENOR4Q]

Does anyone, including headroom modify the MOH(R) or max. Specificaly the opamp and buffers. Maybe using an OPA637 opamp with el2002 buffers or somehting else?

 

[Squalish]

I think they're potted to reduce oxidation, making mods difficult.

 

[puppyslugg]

Looking at the Headroom picture, they don't appear to be potted:

http://www.headphone.com/layout.php?...subTopicID=167

 

[Squalish]

Idono, that's just what I heard somewhere. Verified that an older Airhead isn't, but not sure about the higherend.

 

[eric343]

there's no reason for them to be potted. Tyll's bragged about the fact that the solder contains a plastic which covers the joint when the solder cools, preventing oxidization.

The HeadRoom circuitry does not contain any open-loop buffers a la the META42. The output stage is a push/pull discrete transistor configuration, afaik. Similarly, the opamps are the already good OPA627 (at least for the high end stuff), though the AD9610/843 might give some sound improvement. The opamps are SMD types so you'll need an SMD rework station to remove them (while a normal soldering iron might work, these are $1000+ amps we're talking about!); I posted a link earlier to a source that sells a decent one for the ridiculously low price of $200.

 

[Squalish]

Quote:

Originally posted by KurtW Speaking of upgradablility, don't rule out the Corda. My Corda (I build mine from a kit, so I can't speak for the assembled version but I'm sure you could find out from Jan) comes with IC sockets. The OPA627 that is featured with the top of the line HeadRoom amps can be plugged into the sockets for the first stage of the Corda. I've done this and think that it improves the sound. The second stage delivers the current for driving the headphones. HeadRoom uses transistors here and the IC that the Corda uses is a high current one that would be better than the OPA627 but there are other alternatives here too. The schematic for the Corda is published and the circuits are not potted like the HeadRoom amps so they are much easier for a DIY person to modify. The upgrades through HeadRoom are typical of the usual manufacturer upgrades...a little pricy. Better that than none at all, of course. Good luck on your choice...I think you'll be happy either way for the price.

Quote:

Originally posted by thomas I personally do not think it is worth it, compared with the other amps available on the market. The RA-1 is a very simple and low cost amp, but all the electronics are potted away so we don't know what's inside. In comparason, Headroom is very open about their designs, and you can clearly see that they have good designs and high quality parts.

Quote:

Originally posted by pboser Got my mug(s) and pots too - THANKS, Danny! And buried under the foam peanuts on the bottom is............. a potted module!!!! Anybody got a pinout, etc. for the module? Headroom is the best! Pete

From a search... I don't know.

 

[Voodoochile]

What are you planning?

 

[SENOR4Q]

For now, not a damn thing

. Those amps are waaaayyyy too expensive for me. One can always dream though, and plan ahead

.

 

[Voodoochile]

Sure, that's what keeps us all moving ahead!