Latest Thread Images

Studiovjdsc421fadedWM.jpg
See full thread gallery...
[Impression] JDS Labs C421 (OPA2227 vs. AD8620) featuring cmoyBB, O2, T5 and UHA-4.
Feb 22, 2014 at 8:26 PM 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
 
Feb 23, 2014 at 6:58 AM Post #34 of 51
rudi0504 said:
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
Click to expand...

 
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
 
Feb 23, 2014 at 3:43 PM Post #35 of 51
rudi0504 said:
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
Click to expand...

 
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
 
Feb 25, 2014 at 3:47 PM Post #37 of 51
Feb 25, 2014 at 8:44 PM Post #39 of 51
rudi0504 said:
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
Click to expand...

 
Plug and play. It should have a socket on the battery cable.
 
Mar 28, 2014 at 2:13 AM Post #42 of 51
bassman999 said:
  How will this do with DT900 600OHM?
Click to expand...

 
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.
 
Mar 28, 2014 at 9:52 PM Post #44 of 51
bassman999 said:
  From my reading so far, it seems tube driven might be the best bet for the really high ohm phones.
Click to expand...

 
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).
 
Mar 28, 2014 at 10:35 PM Post #45 of 51
clieos said:
   
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).
Click to expand...

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.
 
You must log in or register to reply here.

Users who are viewing this thread

Total: 2 (members: 0, guests: 2)
Back
Top