JC3+

JC3+

Postby edw » Tue Nov 13, 2018 9:06 pm

Anyone know if it uses opamps? And if so which ones? TIA
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Re: JC3+

Postby Brf » Wed Nov 14, 2018 9:35 am

IIRC, the JC3+ has been described as a Vendetta with op amps (J-fets). Sorry, I don't have a clue which op-amp they use. If you open up a JC3+, they "should" be clearly marked.
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Re: JC3+

Postby edw » Wed Nov 14, 2018 10:22 am

Brf wrote:IIRC, the JC3+ has been described as a Vendetta with op amps (J-fets). Sorry, I don't have a clue which op-amp they use. If you open up a JC3+, they "should" be clearly marked.


Yes, just confirmed with Parasound. The JC3+ uses the same opamps as the JC3. From this pic of a JC3, it looks like a BB2134.

Image
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Re: JC3+

Postby Brf » Wed Nov 14, 2018 11:31 am

Mystery solved - Texas Instruments.

Are you planning on changing them with a different op-amp, or just curious?
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Re: JC3+

Postby mmai » Wed Nov 14, 2018 11:37 am

If you are in the mood of modding/upgrading, it uses one BB134 and one BB2134 (the one on the left is too small for me to make out the model, but possibly another BB134 in SOIC to DIP converter), you can replace the BB134 with BB627 and BB2134 with two BB627s - just get a right adapter to convert dual mono SOIC-8 or DIP-8 into one stereo DIP-8 -- please see below:
https://www.ebay.com/itm/5PCS-SOP8-SO8- ... 2869496337
https://www.ebay.com/itm/Gold-plated-DI ... SwwvZZSfz4

Also, the Rel-Cap output caps (C5 and C6) are good candidates for upgrade as well and there are many choices (Auricap, DynamiCap, Mundorf, Cardas, etc.).

These mods should bring the JC3+/JC3 to another level.
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Re: JC3+

Postby edw » Wed Nov 14, 2018 12:45 pm

Brf wrote:Mystery solved - Texas Instruments.

Are you planning on changing them with a different op-amp, or just curious?


I was just curious as there are a lot of phono pres using opamps. And allows for opamp rolling.
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Re: JC3+

Postby edw » Wed Nov 14, 2018 12:47 pm

mmai wrote:If you are in the mood of modding/upgrading, it uses one BB134 and one BB2134 (the one on the left is too small for me to make out the model, but possibly another BB134 in SOIC to DIP converter), you can replace the BB134 with BB627 and BB2134 with two BB627s - just get a right adapter to convert dual mono SOIC-8 or DIP-8 into one stereo DIP-8 -- please see below:
https://www.ebay.com/itm/5PCS-SOP8-SO8- ... 2869496337
https://www.ebay.com/itm/Gold-plated-DI ... SwwvZZSfz4

Also, the Rel-Cap output caps (C5 and C6) are good candidates for upgrade as well and there are many choices (Auricap, DynamiCap, Mundorf, Cardas, etc.).

These mods should bring the JC3+/JC3 to another level.


Excellent. Thanks for that.

There are a few other phono pres using the 2134 too.
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