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Old 6th January 2007, 05:14 PM   #21
dennyj is offline dennyj  United States
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Default Need help on the mechanics of the switch

I hate to be stupid but I just bought a TU-9900 and I want to upgrade the OPAMps. I have some 2604s and I need to know how to actually go about going from the 7 pin 7136 to the 8 pin 2604. Can someone run me thought it? I do have some inline sockets and 8 pin sockets, if that helps.

Thanks, Denny
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Old 6th January 2007, 05:17 PM   #22
Netlist is offline Netlist  Belgium
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Denny,

Welcome.
You found the mod at the tuner site didn't you?
I do own a TU-9900 as well and replaced the opamps. Give me some time and I'll take a picture or explain how I did it.

/Hugo
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Old 6th January 2007, 05:30 PM   #23
dennyj is offline dennyj  United States
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Default Thank you!

Thanks! I'd also appreciate any suggestions you have on other upgrades to the TU 9900. I just got it and haven't started anything yet.

fmtunerinfo seems to recomend uping the size of capitors by 2x. I guess I can see that in the main power supply ones but why up the others? Wouldn't that throw off the design parameters? Or is bigger just better?

Appreciate the help, Denny
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Old 6th January 2007, 06:00 PM   #24
Netlist is offline Netlist  Belgium
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I used two OPA604 and plugged them into a 16 pin DIL socket.
I just soldered wires to the corresponding pins and holes in the PCB and that’s it.

Google for ‘OPA2604 pdf’, the rest should be pretty straightforward.
You can get away with an 8 pin DIL as the 2604 is a dual opamp.
Attached is the schematic of the TU-9900 output. I didn’t use pin 1 and 5.
Furthermore, I replaced all power supply caps.

/Hugo
Attached Images
File Type: gif ta7136p.gif (35.6 KB, 553 views)
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Old 28th November 2007, 03:39 AM   #25
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With that Boss DS-1 how did things go with that substitution? A diagram for the unavoidable repinning would be nice. Less noise is always a good thing.

I've done the usual mods and love the 1n4002 diodes but also have a switch to toggle to some geraniums. It fits next to the battery compartment spring, hidden. Any other mods, aside from the cap upgrades, that you've done? I've an older Japanese version as well.

Guitarist, N. Vancouver
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Old 16th December 2007, 08:32 PM   #26
max29 is offline max29  Netherlands
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Starting to work on the tu9900 as it just arrived .....

Only the stereo light is not working as stereo as well only mono.
so someone knows where the stereo mono signalling is coming from....


Replacing the capacitors with twice the Uf is not necessary at all i feel.
The bigger the better is not my cup of tea but the quality of the caps is all. Not the uF's.The same with the v. The high voltage caps are least 'audiominded' so to say ..
The 50v... 63 vdc are the best. I avoid the 6,3v allways and use the 100v only when indicated. These v-ees sound poorly for audio.
Sansui only placed in the 6.3 v as moneysavers as the grey cw elna's as well . Not one grey elna the better the sound quality.I replace all. And get rewarded.

There are many high quality caps on the market but i use blackgates F at the most vital spots.. Really very nice ...Muse kg and kz and elna's but there are many more.
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Old 2nd December 2011, 11:34 PM   #27
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Quote:
Originally Posted by guitaristz View Post
With that Boss DS-1 how did things go with that substitution? A diagram for the unavoidable repinning would be nice. Less noise is always a good thing.

I've done the usual mods and love the 1n4002 diodes but also have a switch to toggle to some geraniums. It fits next to the battery compartment spring, hidden. Any other mods, aside from the cap upgrades, that you've done? I've an older Japanese version as well.

Guitarist, N. Vancouver
Hi, very interesting thread. I love to find a way to substitute a dual opamp in my MIJ DS-1 that uses the TA7136. Did you ever figure out a way to map the pinout of a dual opamp to the layout on the pcb of the MIJ DS-1?

Thanx,

tvonmac
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Old 11th October 2014, 04:35 AM   #28
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Hola Paba muchas gracias, de verdad esto lo buscaba desde hace mucho tiempo para poder solucionar un problema con mi technics sh8030 mil gracias para ti!!!
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