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[Impression] JDS Labs C421 (OPA2227 vs. AD8620) featuring cmoyBB, O2, T5 and UHA-4. - Page 3

post #31 of 51

great review

post #32 of 51

The O2 is definitley a beast!  (Not very portable)

post #33 of 51
Anybody know about battery replacement for this Jds labs amp C421
I have long time not use it , now the battery is dead
I write email to Jds , but the price included shipping is vey expensive about 50 USD
If I sell my C421 only 90 USD
Thank you
post #34 of 51
Thread Starter 
Quote:
Originally Posted by rudi0504 View Post

Anybody know about battery replacement for this Jds labs amp C421
I have long time not use it , now the battery is dead
I write email to Jds , but the price included shipping is vey expensive about 50 USD
If I sell my C421 only 90 USD
Thank you

 

It is the standard iPod 4G battery IIRC. Here is an identical one you can get from eBay for under $20: http://www.ebay.com/itm/Fit-Apple-iPOD-Photo-4th-Generation-U2-battery-/360205622821?pt=Battery_Chargers&hash=item53dded9e25

post #35 of 51
Quote:
Originally Posted by rudi0504 View Post

Anybody know about battery replacement for this Jds labs amp C421
I have long time not use it , now the battery is dead
I write email to Jds , but the price included shipping is vey expensive about 50 USD
If I sell my C421 only 90 USD
Thank you

 

Hm, did you request USPS Express shipping? Cost of the battery is under $10 USD.

 

Here's the part on eBay for $16.95 shipped:

http://www.ebay.com/itm/Fit-iPOD-4th-Generation-battery-1200-mAh-new-/181328437577?pt=Battery_Chargers&hash=item2a38046149

Reply
post #36 of 51
Quote:
Originally Posted by ClieOS View Post

It is the standard iPod 4G battery IIRC. Here is an identical one you can get from eBay for under $20: http://www.ebay.com/itm/Fit-Apple-iPOD-Photo-4th-Generation-U2-battery-/360205622821?pt=Battery_Chargers&hash=item53dded9e25

Thank you ClieOS for your info
post #37 of 51
Quote:
Originally Posted by jseaber View Post

Hm, did you request USPS Express shipping? Cost of the battery is under $10 USD.

Here's the part on eBay for $16.95 shipped:
http://www.ebay.com/itm/Fit-iPOD-4th-Generation-battery-1200-mAh-new-/181328437577?pt=Battery_Chargers&hash=item2a38046149

Hi jseaber
Yes I have requested with the cheapest shipping , they said normally they used fed ex
Thank you for your info
post #38 of 51
I just got the iPhone 4G battery from my friend
How can I replace the battery just plug and play or I must solder ?
Please advise
Thank you
post #39 of 51
Thread Starter 
Quote:
Originally Posted by rudi0504 View Post

I just got the iPhone 4G battery from my friend
How can I replace the battery just plug and play or I must solder ?
Please advise
Thank you

 

Plug and play. It should have a socket on the battery cable.

post #40 of 51
Quote:
Originally Posted by ClieOS View Post

Plug and play. It should have a socket on the battery cable.

Hi ClieOS

Thank you for your help , I will try to open by my self , I got the battery now
post #41 of 51

How will this do with DT900 600OHM?

post #42 of 51
Thread Starter 
Quote:
Originally Posted by Bassman999 View Post
 

How will this do with DT900 600OHM?

 

By spec, it should do well enough. But any time with a 600ohm headphone, you are probably going to get better result with desktop amp.

post #43 of 51
Quote:
Originally Posted by ClieOS View Post
 

 

By spec, it should do well enough. But any time with a 600ohm headphone, you are probably going to get better result with desktop amp.

From my reading so far, it seems tube driven might be the best bet for the really high ohm phones.

post #44 of 51
Thread Starter 
Quote:
Originally Posted by Bassman999 View Post
 

From my reading so far, it seems tube driven might be the best bet for the really high ohm phones.

 

Not really. It is not about tube vs. solid state but more about competent vs. incompetent design. Tube amps have their own problems, and often more so than solid state design and requirement more attention to get it right (= cost more as well).

post #45 of 51
Quote:
Originally Posted by ClieOS View Post
 

 

Not really. It is not about tube vs. solid state but more about competent vs. incompetent design. Tube amps have their own problems, and often more so than solid state design and requirement more attention to get it right (= cost more as well).

I know little about amp designs, and was under the impression solid state make more power with lower loads..only problems are heat, and less cone/driver control.

Making them sound better with higher loads, but with way less output power.

 

I also thought somehow tubes put out more current with higher loads, and this was just based on specs from a few designs I saw.

 

I also have no idea what amount of V or I is required to drive headphones or even mine specifically 990 600ohm to full output without clipping.

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Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › [Impression] JDS Labs C421 (OPA2227 vs. AD8620) featuring cmoyBB, O2, T5 and UHA-4.