Luxman D-405 opamp and mod suggestions

fmjunkie · 22nd October 2011, 10:10 PM

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.

SoNic_real_one · 23rd October 2011, 09:08 PM

I never heard of JRC4020 or 4037...

fmjunkie · 24th October 2011, 04:07 AM

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.

stephensank · 24th October 2011, 05:17 AM

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.

SoNic_real_one · 08:17 AM

Quote:

Originally Posted by fmjunkie

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.

fmjunkie · 24th October 2011, 12:25 PM

Hey, thanks. I appreciate the help. I'll give the OPA2134 a shot.

fmjunkie · 25th October 2011, 03:33 PM

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?

stephensank · 25th October 2011, 04:43 PM

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.

fmjunkie · 25th October 2011, 07:16 PM

Quote:

Originally Posted by stephensank

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?

SoNic_real_one · 26th October 2011, 12:25 AM

Brown Dog adaptors.

22nd October 2011, 10:10 PM	#1
fmjunkie diyAudio Member Join Date: Oct 2011 Location: Arlington	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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23rd October 2011, 09:08 PM	#2
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	I never heard of JRC4020 or 4037...

24th October 2011, 04:07 AM	#3
fmjunkie diyAudio Member Join Date: Oct 2011 Location: Arlington	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.

24th October 2011, 05:17 AM	#4
stephensank diyAudio Member Join Date: Oct 2006	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.

24th October 2011, 12:25 PM	#6
fmjunkie diyAudio Member Join Date: Oct 2011 Location: Arlington	Hey, thanks. I appreciate the help. I'll give the OPA2134 a shot.

25th October 2011, 03:33 PM	#7
fmjunkie diyAudio Member Join Date: Oct 2011 Location: Arlington	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?

25th October 2011, 04:43 PM	#8
stephensank diyAudio Member Join Date: Oct 2006	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.

26th October 2011, 12:25 AM	#10
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	Brown Dog adaptors.

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