hi all!
re: bleed issue:
sorry for late comment about this, but i got no notifications of new posts to this thread.
anyway, i noticed an issue w/my 07x, which only occurred when switching from balanced 2 to balanced 1. sometimes i'd get no sound, sometimes i'd get both 2 & 1 playing, sometimes 1 would play at a muted level. (and going from 1 to 2 also worked perfectly) so, when i spoke with doug dale about it, he said it sounded like a relay issue, and i'd have to send it in, as it wasn't a socketed part that could be swapped out. well, i was in no rush; i wanted it fixed, but it wasn't a deal breaker, since going from aux or disc to balanced 1 worked perfectly. and i was waiting to get my melos ma333r back from mark porzilli, so i wanted to wait until that happened, so i'd still have a great preamp in my system.
well, mark porzilli is now either (a): no longer mentally competent and/or capable of proper documentation, or (b): an asshole. i suspect it's a mix. it took me a year of back-n-forth emails to get him to finally agree he was responsible for repairing the unit under warranty, (suffering the nasty abuse of him saying i was accusing him of sending out something that wasn't tested, {which it WASN'T}; and accusing me of trying to rip him off for a freebie repair, until i documented events via emails). then, after i sent it out, it took him 25 months to finally return the preamp. and to add insult to injury, instead of doing the proper repair to the balance pot and the special tube volume pot that was installed almost 20 years ago for $500, he just ripped everything out and installed a $15 cheap chinese sourced alps pot. it's too bad; the preamp still sounds great, even w/the cheap alps pot, but it sounded better before i sent it back to him for repair. (i'd originally paid $1k for a circuitry mod, which sounded great, but the remote & balance/volume controls weren't working properly when i got it back.) i will likely replace the cheap chinese alps pot with a tortuga ldr pot, a relatively easy conversion, before i can really decide which preamp to keep. (sorry for the diversion, i was less than pleased and just had to vent. mark was always cool in my dealings w/him prior; he's definitely got a screw loose somewhere, now. or maybe he just gets nasty, if he's made a mistake; some people are like that.)
after all that, the melos still sounds great & i know it will sound even better w/a tortuga ldr volume/balance pot. the fact that i'm still considering keeping the coda, being a bona fide tubehead, speaks for how excellent *it* is. i thought i'd *never* have a s/s preamp in my main system.
anyway, now, w/the melos back in the system, it was the time to contact doug dale and reschedule having the 07x sent out to him to fix the relay. sometimes, it's good to wait - when i contacted doug initially, he thought a relay that was soldered to the board was bad; he now said that coda received a bad run of another chip that's socketed, and that it's been misbehaving in some amps as well as preamps, similar to the problems i was having, so it's most likely that chip and not the relay. so, he agreed to mail me the chip as it's not a difficult diy, as long as you're careful aligning the 16-pin chip w/the sockets. worse case, it's something else, (which i now doubt), and i'll have to send it off anyway. i haven't yet put the 07x back into the system, (switching out preamps in my system is a b**ch), but i powered it up and everything works, regarding the switching, anyway.
when the 2-to-1 switching problem 1st occurred, the 2-to-1 switching clicked much quieter than any other source selection changes, and i'd initially thought that was indicative of the bleeding/muted sound/no sound problem, so when i installed the new chip, and 2-to-1 switching still clicked much quieter than the source selection changes, i was concerned the problem may still exist. so i called doug about the differing sound of the relays clicking; he said it was mere coincidence that the 2-to-1 click was quieter than the others, and not related to the problem. the preamp's circuitry is such that balance 1 comes on when the unit is turned on, so going from 2-to-1 engages one less relay than any other source selection change, making a quieter click than the others. while not 100% certain the issue is fixed until i try it connected in my system, doug is convinced the chip i replaced was bad, because of my getting either no sound, muted sound, or bleed-thru when going from 2-to-1. he said that issue is directly attributable to what this chip should be doing - especially the bleed-thru.
so, all you owners with bleeding 07x's may want to contact doug at coda and tell him you need a new 4094 chip. and hearing about others w/this problem, and only occurring w/the balance inputs, i'm confident it's the issue, and a good 4094 will fix it. and it's nice not to have to deal with sending the unit out for repair. i will follow up when mine is back in my system.
if you look at this pic, the chip that needs replacing is at the far left/center, to the left of the 'coda' logo; above and perpendicular to the much larger chip.
https://www.linearsystems.com/lsdata/images/Coda-012216-p-021.jpg
doug s.
ps - if customer service is a priority, coda's doug dale is great! he was ready to send me out a call tag to send the unit back to him, before he sent out the chip.
re: bleed issue:
sorry for late comment about this, but i got no notifications of new posts to this thread.
anyway, i noticed an issue w/my 07x, which only occurred when switching from balanced 2 to balanced 1. sometimes i'd get no sound, sometimes i'd get both 2 & 1 playing, sometimes 1 would play at a muted level. (and going from 1 to 2 also worked perfectly) so, when i spoke with doug dale about it, he said it sounded like a relay issue, and i'd have to send it in, as it wasn't a socketed part that could be swapped out. well, i was in no rush; i wanted it fixed, but it wasn't a deal breaker, since going from aux or disc to balanced 1 worked perfectly. and i was waiting to get my melos ma333r back from mark porzilli, so i wanted to wait until that happened, so i'd still have a great preamp in my system.
well, mark porzilli is now either (a): no longer mentally competent and/or capable of proper documentation, or (b): an asshole. i suspect it's a mix. it took me a year of back-n-forth emails to get him to finally agree he was responsible for repairing the unit under warranty, (suffering the nasty abuse of him saying i was accusing him of sending out something that wasn't tested, {which it WASN'T}; and accusing me of trying to rip him off for a freebie repair, until i documented events via emails). then, after i sent it out, it took him 25 months to finally return the preamp. and to add insult to injury, instead of doing the proper repair to the balance pot and the special tube volume pot that was installed almost 20 years ago for $500, he just ripped everything out and installed a $15 cheap chinese sourced alps pot. it's too bad; the preamp still sounds great, even w/the cheap alps pot, but it sounded better before i sent it back to him for repair. (i'd originally paid $1k for a circuitry mod, which sounded great, but the remote & balance/volume controls weren't working properly when i got it back.) i will likely replace the cheap chinese alps pot with a tortuga ldr pot, a relatively easy conversion, before i can really decide which preamp to keep. (sorry for the diversion, i was less than pleased and just had to vent. mark was always cool in my dealings w/him prior; he's definitely got a screw loose somewhere, now. or maybe he just gets nasty, if he's made a mistake; some people are like that.)
after all that, the melos still sounds great & i know it will sound even better w/a tortuga ldr volume/balance pot. the fact that i'm still considering keeping the coda, being a bona fide tubehead, speaks for how excellent *it* is. i thought i'd *never* have a s/s preamp in my main system.
anyway, now, w/the melos back in the system, it was the time to contact doug dale and reschedule having the 07x sent out to him to fix the relay. sometimes, it's good to wait - when i contacted doug initially, he thought a relay that was soldered to the board was bad; he now said that coda received a bad run of another chip that's socketed, and that it's been misbehaving in some amps as well as preamps, similar to the problems i was having, so it's most likely that chip and not the relay. so, he agreed to mail me the chip as it's not a difficult diy, as long as you're careful aligning the 16-pin chip w/the sockets. worse case, it's something else, (which i now doubt), and i'll have to send it off anyway. i haven't yet put the 07x back into the system, (switching out preamps in my system is a b**ch), but i powered it up and everything works, regarding the switching, anyway.
when the 2-to-1 switching problem 1st occurred, the 2-to-1 switching clicked much quieter than any other source selection changes, and i'd initially thought that was indicative of the bleeding/muted sound/no sound problem, so when i installed the new chip, and 2-to-1 switching still clicked much quieter than the source selection changes, i was concerned the problem may still exist. so i called doug about the differing sound of the relays clicking; he said it was mere coincidence that the 2-to-1 click was quieter than the others, and not related to the problem. the preamp's circuitry is such that balance 1 comes on when the unit is turned on, so going from 2-to-1 engages one less relay than any other source selection change, making a quieter click than the others. while not 100% certain the issue is fixed until i try it connected in my system, doug is convinced the chip i replaced was bad, because of my getting either no sound, muted sound, or bleed-thru when going from 2-to-1. he said that issue is directly attributable to what this chip should be doing - especially the bleed-thru.
so, all you owners with bleeding 07x's may want to contact doug at coda and tell him you need a new 4094 chip. and hearing about others w/this problem, and only occurring w/the balance inputs, i'm confident it's the issue, and a good 4094 will fix it. and it's nice not to have to deal with sending the unit out for repair. i will follow up when mine is back in my system.
if you look at this pic, the chip that needs replacing is at the far left/center, to the left of the 'coda' logo; above and perpendicular to the much larger chip.
https://www.linearsystems.com/lsdata/images/Coda-012216-p-021.jpg
doug s.
ps - if customer service is a priority, coda's doug dale is great! he was ready to send me out a call tag to send the unit back to him, before he sent out the chip.