Luxman D-405 opamp and mod suggestions - diyAudio
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Old 22nd October 2011, 10:10 PM   #1
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Default Luxman D-405 opamp and mod suggestions

I piked up an old silver-faced Luxman D-405 at Goodwill the other day for $5. It's a pretty neat player and doesn't sound too bad despite the old 16-bit DAC. I've got to replace a little belt that opens the transport and figure while I'm in there I might as well do some low-cost mods by replacing some of the caps and opamps. I'm running into an issue with the latter. Looks like it uses two JRC opamps, a 4037 and a 4020. Can't find a thing on these guys. Any suggestions what might be good replacements? Also, I'm a beginner at this, but I'd take any other suggestions for easy mods.
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Old 23rd October 2011, 09:08 PM   #2
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I never heard of JRC4020 or 4037...
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Old 24th October 2011, 04:07 AM   #3
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The manufacturer, JRC, is Japan Radio Company. I believe it's now called NJR, New Japan Radio. Printing on the parts are: 072DH JRC 4037 and 072DG JRC 4020. This player was introduced back in 1984 so has been out of production for a long time. I doubt there is much info out there but I'm keeping my fingers crossed.
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Old 24th October 2011, 05:17 AM   #4
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Those are TL072 dual opamps, standard issue. Just from JRC instead of TI. The other #'s are just batch #'s. I'd replace them with OPA2134.
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Old 24th October 2011, 08:09 AM   #5
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Quote:
Originally Posted by fmjunkie View Post
The manufacturer, JRC, is Japan Radio Company. I believe it's now called NJR, New Japan Radio.
I know that, just they didn't have those part numbers on their database. After your posting, I saw that you read them wrong, in the first post you give us the batch numbers instead of the part number.
OPA2134 should be more that ok, they replace well the old 072.

Last edited by SoNic_real_one; 24th October 2011 at 08:17 AM.
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Old 24th October 2011, 12:25 PM   #6
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Hey, thanks. I appreciate the help. I'll give the OPA2134 a shot.
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Old 25th October 2011, 03:33 PM   #7
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Hey guys. I'm looking for another dual opamp substitute whose package only has one row of legs: TA75458S. I found NTE1529 for about $12. That seems steep, and since there are four on the board, I'm wondering if there is something else (more up-to-date) I can try. Ideas?
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Old 25th October 2011, 04:43 PM   #8
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You are referring to a "SIP" package, "single inline pins", and there are no really great opamps available in that form. When I need to deal with this, I use a surfacemount OPA2134UA on an SOIC-8 to SIP adapter board. If it's a 9pin SIP, you have to shift the 8-pin adapter to account for the redundant B+ pin, i.e., pins 1 and 9 are both B+, with B- on middle #5 pin. As for actual SIP chips, the best you can do is an NEC uPC4570S, which is not a lot better than a regular 4558/5532 type.
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Old 25th October 2011, 07:16 PM   #9
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Quote:
Originally Posted by stephensank View Post
You are referring to a "SIP" package, "single inline pins", and there are no really great opamps available in that form. When I need to deal with this, I use a surfacemount OPA2134UA on an SOIC-8 to SIP adapter board. If it's a 9pin SIP, you have to shift the 8-pin adapter to account for the redundant B+ pin, i.e., pins 1 and 9 are both B+, with B- on middle #5 pin.
Yeah, I was thinking about something like that. Got a good source for SIP adapter boards? Google doesn't turn up much...Here's a crazy question: Would it be possible to make my own from PC board and run leads from the pins into the old through-holes? If so, would I have to worry about resistance and voltage drop along the leads? Stupid idea?
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Old 26th October 2011, 12:25 AM   #10
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Brown Dog adaptors.

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