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Old 20th November 2015, 03:01 PM   #1
asilker is offline asilker  United States
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Default JBL 6230 Mods?

I'm still developing a functional understanding of where to jump in and troubleshoot/fix/modify amplifiers, so I'm thinking my JBL 6230 could be a fun project. Sounds great, and from what I can gather these amps seem fairly well respected. Sanken output transistors and very heavy duty construction.

In the pursuit of familiarity and experience, I'm wondering what kind of modifications can be done here to improve the amp. The TL084 quad op amps are on sockets, so I'm considering replacing them with AD713 or something similar as it would be a mod as easy as pop out - pop in.

But I am open to any suggestions as to how to change or rearrange the circuit. Here's the schematic, on page 31 of the service manual: http://www.jblproservice.com/pdf/Vin...6260manual.pdf

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Old 20th November 2015, 03:32 PM   #2
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Location: The Jurassic Coast, England. GB
The AD713 is a high speed BiFET op amp that offers excel-lent performance at competitive prices. It upgrades the per-
formance of circuits using op amps such as the TL074/
TL084, LT1058, LF347 and OPA404.
2. Slew rate is 100% tested for a guaranteed minimum of
16 V/
s (J, A and S Grades).
3. The combination of Analog Devices’ advanced processing
technology, laser wafer drift trimming and well-matched
ion-implanted JFETs provides outstanding dc precision. In-
put offset voltage, input bias current and input offset current
are specified in the warmed-up condition and are 100%
4. Very close matching of ac characteristics between the four
amplifiers makes the AD713 ideal for high quality active filter
Won't achieve anything but try them if you want.
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak. www.jonsnell.co.uk
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Old 20th November 2015, 03:34 PM   #3
asilker is offline asilker  United States
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Originally Posted by JonSnell Electronic View Post
Won't achieve anything but try them if you want.
You don't think an op amp change will make any difference?

What would improve them amp?
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