Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › Where do I buy the "REAL" Altoids amp?
New Posts  All Forums:Forum Nav:

Where do I buy the "REAL" Altoids amp? - Page 2

post #16 of 35

Search BioScienceGeek. His builds are pretty solid and clean.

post #17 of 35
Thread Starter 

I am trying to decide between the JDS cmoyBB and the Zigis ABB CMoy.

They are the same price

http://www.ebay.com/itm/NEW-ABB-CMoy-headphone-amplifier-with-Adjustable-Bass-Boost-ABB-DC-input-/251241570620?ssPageName=ADME:X:RTQ:US:1123

post #18 of 35
Thread Starter 
Quote:
Originally Posted by FilipinoAko View Post
 

Search BioScienceGeek. His builds are pretty solid and clean.

I looked on eBay and he doesnt have any listed currently.

post #19 of 35
Quote:
Originally Posted by Bassman999 View Post
 

I am trying to decide between the JDS cmoyBB and the Zigis ABB CMoy.

They are the same price

http://www.ebay.com/itm/NEW-ABB-CMoy-headphone-amplifier-with-Adjustable-Bass-Boost-ABB-DC-input-/251241570620?ssPageName=ADME:X:RTQ:US:1123

 

I would go for JDS, at least you're sure which opamps are used.

post #20 of 35
Thread Starter 

Yeah, seems like that is a crucial part of the design.

post #21 of 35

If it is my choice, I'll go LM4562 > OPA2227 > OPA2134. However, these opamp are not expensive at all. You can get them for a few bucks and swap it yourself.

post #22 of 35
Thread Starter 
Quote:
Originally Posted by ClieOS View Post
 

If it is my choice, I'll go LM4562 > OPA2227 > OPA2134. However, these opamp are not expensive at all. You can get them for a few bucks and swap it yourself.

What is the difference?

IS there actually a change in sound?

I saw they are like $3-$6 each dep on where you get em.

post #23 of 35
Quote:
Originally Posted by Bassman999 View Post
 

What is the difference?

IS there actually a change in sound?

I saw they are like $3-$6 each dep on where you get em.

 

Opamp can be different in voltage swing, output current, output impedance, capacitance load capability, noise etc - so yes, they can sound different. OPA2227 is the usual choice for cmoy these days, but it used to be OPA2134, which is what the original cmoy is designed upon. However, any opamp that can run lower than +/-4.5V can be put into a cmoy. Whether it will sound good is another matter, and that is usually where people stand to debate which is better. Personal preference also play apart.

post #24 of 35
Thread Starter 
Quote:
Originally Posted by ClieOS View Post
 

 

Opamp can be different in voltage swing, output current, output impedance, capacitance load capability, noise etc - so yes, they can sound different. OPA2227 is the usual choice for cmoy these days, but it used to be OPA2134, which is what the original cmoy is designed upon. However, any opamp that can run lower than +/-4.5V can be put into a cmoy. Whether it will sound good is another matter, and that is usually where people stand to debate which is better. Personal preference also play apart.

Are these opamps easily changed?

I would love to hear differences and pick the one that suits my hp and/or my tastes.

If they dont require serious mods to get in and out I might buy a few different ones.

There is one from a Chinese guy on eBay that comes with 4 different ones.


Edited by Bassman999 - 3/16/14 at 10:32am
post #25 of 35

post #26 of 35
Thread Starter 

Awesome, I wasnt sure if they were soldered or not.

Super simple except I have giant thumbs

post #27 of 35
Thread Starter 

I might be ordering a JDS tomorrow, and getting extra OPs to mess with


Edited by Bassman999 - 3/25/14 at 3:12pm
post #28 of 35
Thread Starter 

OK so I bought the Altoids cMoybb V2.02

 

Can this power Beyerdynamic DT880 Premium 600 OHM?

post #29 of 35
Thread Starter 
Quote:
Originally Posted by Bassman999 View Post
 

OK so I bought the Altoids cMoybb V2.02

 

Can this power Beyerdynamic DT880 Premium 600 OHM?

I bought a pair of DT-990s 600 ohm Premium

Can anyone tell me if this JDS cMoyBB V2.02ca properly power them??

post #30 of 35

I just had a custom 18v CMOY Altoids amp assembled for me by Tom Askew (Askewlabs) in the UK, his amps are up on ebay. I gave him a free hand at upgrading his standard 9v Altoids amp, and had him toss in some of his favorite price is no object op amps, but I see he now is offering a standard 18v Altoids amp for only a couple of dollars more than his standard 9v amp, good deal, but I'm so glad I had him do the upgrades.

 

I'm powering a pair of Beyerdynamic DT-880 Pros (300 ohm) with it. Silent and powerful, nice improvement in airiness and definition from the 9v version I first bought from him. 

 

Pic of the amp,

 

https://flic.kr/p/nCTUyq

 

and the op amps,

 

https://flic.kr/p/nmpEVv

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Portable Headphone Amps
Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › Where do I buy the "REAL" Altoids amp?