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> 1 module of 2 pre-mounted OPA627AU op-amps on adapter
1 module of 2 pre-mounted OPA627AU op-amps on adapter
OPA627AU.jpg picture by biglawhk
* Two TI (Burr-Brown) OPA627 single-channel op-amps pre-mounted on a single-to-dual op-amp (SO8 to 8-pin DIP) adapter.
* Supply Voltage Range: +/- 4.5v to +/- 18v
* LOW NOISE: 4.5nV/ Hz at 10kHz
* HIGH-PERFORMANCE AUDIO CIRCUITRY
* HIGH-PERFORMANCE IN CD OR DAC OUTPUT AMPLIFIER
* PRECISION INSTRUMENTATION
* 52K OHM ACROSS PIN1 & 5 0N EACH OPA627AU
* MINI SIZE DESIGN ( ONE ON TOP AND ONE BELOW )EASY FITTING TO LIMITED SPACE.
P1010113.jpg picture by biglawhk
P1010114.jpg picture by biglawhk
P1010115.jpg picture by biglawhk
P1010116.jpg picture by biglawhk
What the best OPA 627 or 637 ?
Burr Brown OPA 627 BP(single, ceramic) on Browndog adaptor
Comment: Two words sum this chip up........ "absolute class" This is single chip and it was necessary to fit two single channel 627's onto a single to dual Browndog adaptor which Adapts two single-channel DIP-8 op-amps to a dual DIP-8 pinout. These 2 single channel op amps absolutely trounced anything that had gone before them ..... the width of the soundstage, the clarity and the sheer presence make this my choice of op amp without a shadow of a doubt. The sound is just so "clean", so "natural", so "musical" and so "detailed" with the 627's on board.
Burr Brown OPA 637 BP(single, ceramic) on Browndog adaptor
A "Very" revealing chip, sound similar to the OPA627 but puncher around the edges. I found this chip gave out "way" too much information for my liking. It is analytical to the point that certain pieces of music can become impossible to listen to, especially bad recordings, it reproduces every last detail / imperfection with microscopic accuracy which, at times, can be detrimental to the overall enjoyment of the music. For those that love a warts and all insight into the music then this is the star of the show but it may not be to everyone liking. The Burr Brown 627 "is" headphone heaven....... absolute class act.
It is very difficult to say which one is better since they are belongs to the same family and they have the similar sound characteristic .If you check the specification of these op amp , you will find 637 have a better bass performance.But tonal balance, natural and colouration, 627 is better. Usually I'll recommend to use 627 in dac section and 637 in headphone amp section since 637 will help to solve the weak bass perfoemance in many headphones. Many western people like 637 because they like rock and rolls and 637 hit their purpose!
