Self Medicating > General DIY
op amp upgrade
richidoo:
OK, I wanna get this straight. The OPA2134s were stock, soldered to the PCboard as surface mount SO8, right? Then you had a modder remove those and soldered on a SOIC to DIP conversion to the PC board and now you are using Brown Dogs 970601 to adapt the SO8 opamps into the DIP socket? Sounds like a few extra steps, I must be really confused. That's normal!
If you need help soldering, I am glad to try, I have some small soldering experience, or I have a great audio tech friend who can do it for you. He is factory authorized service for several high end audio brands, including Marantz. So you could send your player to him if it needs TLC to get goin again. What you need is a DIP socket on the marantz board, so you can plug in 8pin DIPs into the socket without soldering. The opamps you are interested in all come as 8pin DIP, even the LM4652.
Am I missing something?
Rich
shep:
Sorry to be incoherant (my natural state) The cdp was first modded in England by a good firm http://www.sercal-electronics.co.uk/. I bought it from Brent, their tecky. So it came with the OPA2134's that pin directly to the board. The 627's I seem to have buggered are mono chips so they had to be soldered to Brown Dod adaptors. I honestly don't know if the later LM4652's I'm supposed to get will also need adaptors or not. If that is the case I'm going to need help.(accepted!) Otherwise it will be a direct swap and bob's your uncle. I sure hope they are as good as stated. I find this a bit unnerving...It must be that these little buggers are ALSO very system dependant. Meaning there's really no way to know in advance how they will sound. My new T-amp will get a dose of 627's but maybe there the sound will be totally different...the cutting edge of Nervosa :shock:
richidoo:
OK, I got it now. The LM4562 opamps are dual, just like the OPA2134, so they will not need a dual>single adapter. So Bob really IS my uncle! I would tend to try the 4562 before anything else as they are quickly becoming SOTA among modders. http://www.national.com/pf/LM/LM4562.html
Here's some other goodies that might help you along the way:
These adapters http://www.accutekmicro.com/product_detail.cfm?Product=SOIC%20Adapters allows you to plug opamps into a SO8 footprint for easy swapping. You can get AK08SOIC-D300S if you want to plug in 8pinDIP packages, or get AK08SOIC-ST if you wanna be able to plug in SOICs for swapping. The latter will require soldering your SOIC to plug in pin adapter before it is ready to plug in. With these you can swap chips quickly with the top off (unplug and drain PS first) for quick sonic comparison.
I did find a nice little FAQ on how to solder SO8 to your board. This might help if you are soldering yourself:
http://cimarrontechnology.com/index.asp?PageAction=Custom&ID=12
And something to make desoldering small SMD easy:
http://www.emulation.com/catalog/off-the-shelf_solutions/lab&rework/chipquik.html
If you need help from a pro, you could send it to Alex: theanalogstore.com or probably find someone nearby.
Good luck Shep!!!!
Rich
shep:
Thanks a lot for all the input! I know where the confusion came from. I didn't realize that he had revisited the board and installed an on-board permanent adaptor (which of course didn't apply to the solo 627's. When the guy who is sending me the new chips asked or rather told me about soldering, it was because he didn't know that. So fingers crossed, I can just plug and unplug. Good thing you sent me that link because I had neglected to let the caps drain out before-hand. Chances are even if I had plugged the 6's in right the first time, I would have screwed them not respecting this rule. ( I'm talking like I know what I'm saying :shock: )
shep:
Damn! I looked more carefully. There are in fact 4 possible terminations and only one is a plug-in. The others are solder jobs.
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