Hi,
can someone tell me what chip IC 903 is ?
I have that number but schematic doesn't tell me anymore and alot of links in the first part of this thread are gone, I fried this chip and found out metal shavings ,microsize had found thier way to the magnet in the lazer,must have caused it to bind and locked it in place, I file sometimes on my bench so I figured that's where they came from,,,,Any way I need a controller board,or that chip,ANY suggestions,I found some jvc rc31 boxes but they won't ship to usa from canada, THANKS ALOT!
can someone tell me what chip IC 903 is ?
I have that number but schematic doesn't tell me anymore and alot of links in the first part of this thread are gone, I fried this chip and found out metal shavings ,microsize had found thier way to the magnet in the lazer,must have caused it to bind and locked it in place, I file sometimes on my bench so I figured that's where they came from,,,,Any way I need a controller board,or that chip,ANY suggestions,I found some jvc rc31 boxes but they won't ship to usa from canada, THANKS ALOT!
Not the mains and bybee, but the mods before that? Uncle leon tried to guess what they were...
200VA Trafo 12V with CT, 2x Cerafine caps 1000uF/25V, 2x MSR860, 1x LM7808, 2x Blackgates 470uF/25V and removed the ferrite spool and the 2 caps on the board and replaced by a "Red" Blackgate 33 uF/50V
Silver Cotton Jupiter Wire with 2 Allen Bradleys 300/100 and a WBT Next Gen (Gold) and a Furutech Rhodium Power Inlet with a 2K Linefilter and 2 Bybees
I was guessing at Peter's new set of mods, not Erik's (and got them right ).200VA Trafo 12V with CT, 2x Cerafine caps 1000uF/25V, 2x MSR860, 1x LM7808, 2x Blackgates 470uF/25V and removed the ferrite spool and the 2 caps on the board and replaced by a "Red" Blackgate 33 uF/50VNot the mains and bybee, but the mods before that? Uncle leon tried to guess what they were...
Silver Cotton Jupiter Wire with 2 Allen Bradleys 300/100 and a WBT Next Gen (Gold) and a Furutech Rhodium Power Inlet with a 2K Linefilter and 2 Bybees
I was guessing at Peter's new set of mods, not Erik's (and got them right ).
An educated guess....
Not really, I just installed it there assuming it's a best cap for a job, and didn't bother to compare it with anything else this time.
However, I did extensive listening tests with caps directly at the input of a DAC and V-Cap was definitely the best choice here. Some of my friends actually prefer it at the DAC's input vs. no cap at all. The new Cu version of the V-Cap, sounds a bit better too.
However, I did extensive listening tests with caps directly at the input of a DAC and V-Cap was definitely the best choice here. Some of my friends actually prefer it at the DAC's input vs. no cap at all. The new Cu version of the V-Cap, sounds a bit better too.
It is LA6541. All those chips are really hard to find.Hi,
can someone tell me what chip IC 903 is ?
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Hi Peter,
On the 2 latest pics you show a standard spindle against a Delrin with an Ebony Fran Puck.....do you use the latter as your own transport nowadays to judge mods or is it just an older photo...
A pity (for me) that you did a few mods in one go but I do hope that if you are in a situation to hear the original cap 906 against the V-cap that you are willing to post your findings....
I found the Wondercap in the 906 position a "huge" difference but out of stock nowadays...
On the 2 latest pics you show a standard spindle against a Delrin with an Ebony Fran Puck.....do you use the latter as your own transport nowadays to judge mods or is it just an older photo...
A pity (for me) that you did a few mods in one go but I do hope that if you are in a situation to hear the original cap 906 against the V-cap that you are willing to post your findings....
I found the Wondercap in the 906 position a "huge" difference but out of stock nowadays...
ground scheme
If using a two prong electrical plug, where do you terminate the (star) ground.
Would a ground lug on the outside of the unit work, then connect a wire to the ground lug of the preamp (the one meant for phono)
Or is everyone using a 3 wire electrical plug (hot neutral and ground)
Thanks,
Paul
If using a two prong electrical plug, where do you terminate the (star) ground.
Would a ground lug on the outside of the unit work, then connect a wire to the ground lug of the preamp (the one meant for phono)
Or is everyone using a 3 wire electrical plug (hot neutral and ground)
Thanks,
Paul
I use 3-pin electrical plugs everywhere, but star ground is often best left unconnected to earth (this worked best for me so far anyway). I only connect the earth wire to the interwinding shield in my transformers. All my HiFi component cases are non-metal (I made them mostly of wood), so no need to ground anything else as far as I'm concerned...
Hi Peter,
Any news on the effect of changing the C908 cap?
Also, has anyone tried tantalum caps in the Shigaclone. Some years ago I played around with power supplies for the digital side of a DA chip and found that tants in a decoupling role provided the tightest bass....
Any news on the effect of changing the C908 cap?
Also, has anyone tried tantalum caps in the Shigaclone. Some years ago I played around with power supplies for the digital side of a DA chip and found that tants in a decoupling role provided the tightest bass....
I changed C908 at the same time as other caps, so can't say what that particular mod did.
In my reference Shiga transport I had always Delrin disk table, it's just that I didn't use that chassis recently and just put it back into use last week. So yes, that's what I'm using now for listening.
Hi Peter,
On the 2 latest pics you show a standard spindle against a Delrin with an Ebony Fran Puck.....do you use the latter as your own transport nowadays to judge mods or is it just an older photo...
In my reference Shiga transport I had always Delrin disk table, it's just that I didn't use that chassis recently and just put it back into use last week. So yes, that's what I'm using now for listening.
Attachments
Hey Peter,
What is the brand or part number of the toc switch you're using? It's NC but not momentary...correct?
It's a generic switch, normally closed, I get it locally, surplus.
hi would some post or point me to a detailed manual for rcez31! Just need controler board,
Thanks for the chip number PD
Thanks,
Link to manual was posted here: http://www.diyaudio.com/forums/digi...transport-shigaclone-story-4.html#post1471494
hi pforeman,
Most people use a 3 prong ,one reason is it's polarized and the other is it is grounded at the outlet,with a two prong you can turn it around and induce HUM sometimes, the ground should go to the case ,there is 2 grounds one for power and one for signal,In the case from a phono I would ground as near the phono preamp input as I could,and there is a common ground at the power supply,maybe others can add to this!
cheers!
Most people use a 3 prong ,one reason is it's polarized and the other is it is grounded at the outlet,with a two prong you can turn it around and induce HUM sometimes, the ground should go to the case ,there is 2 grounds one for power and one for signal,In the case from a phono I would ground as near the phono preamp input as I could,and there is a common ground at the power supply,maybe others can add to this!
cheers!
Link to manual was posted here: http://www.diyaudio.com/forums/digi...transport-shigaclone-story-4.html#post1471494
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JVC RC-EZ31,35 Service Manual
JVC RC-EZ31,35 Service Manual
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