Hey yall, any recommendations on sellers in the US for these ICs? At Cabintech they only have the MN3207 NOS, which I'm willing to try but they are out of the V3102. I'm hesitant of purchasing from ebay sellers that have not been vouched for after being burned enough times with fake ICs. Thanks for any advice!
Nevermind! I didn't see that Cabintech also carries the the MN3102, so I think I'll go that route.
Cabintech is highly recommended. They screwed up an order of mine and fixed it pronto. GREAT to deal with.
I just bought quite a few NOS mn3102 & MN3207 from Cabintech after reading the recommendation.
30% worked
genuine mixed in with fakes, pretty disappointed.
Pretty sure I got some fakes from them recently. Not sure if it was the BBD or the clock at this point. Only ordered one each so lesson learned I guess. They do say to let them know if you have a higher than 10% fail rate. They have a good reputation so I'm giving them another try. All these supply issue suck. Hopefully they haven't run through all the good NOS.
I have sets of 2 each coming, I got a mini-me/small clone to run the 3207's on but figuring out wtf is going on with the 3102 is new animal. I wanted to put together a pork barrel/CE-2 clone. the gpcb board uses a combo of lm358 and cd4047 to for a clock instead.
Wow, good to know. Pretty surprising, given my past orders, but like you mentioned...supply chain being what it is...
Mark at Cabintech has been pretty reasonable about it at this stage, however I hope they refund me for faulty chips. I also wont be able to get back tax paid importing them, so hopefully I dont get burnt too much.
How're you determining they're fakes?
I don't have much knowledge of this sort of thing but they look sanded and re-labeled. Just got a new one and it definitely looks different. The tops are smoother and the text is really hard to read. Hard to capture on a photo.
The third IC in the one photo is one I just got from GuitarPCB. The other two ICs were from CabinTech.
Did you test them in-circuit, or are you assuming they're fake based on appearance?
I assume because of the desire to call things 'NOS' for some reason, even legitimate chips began getting sanded and relabelled about 7+ years back, so it doesn't really say much.
They don't sand the bottom of the chip though, can sometimes get an idea from that.
Circuit was nonfunctioning with these in them. Still waiting on replacement clock. Like I said not much experience with this sort of thing so yeah, I could be wrong. Are there any other ways to tell for sure you have legit ICs?
Quote from: BryGuy on August 01, 2022, 02:01:24 PM
Circuit was nonfunctioning with these in them. Still waiting on replacement clock. Like I said not much experience with this sort of thing so yeah, I could be wrong. Are there any other ways to tell for sure you have legit ICs?
Best way is to put them in a circuit you know works.
I ran mine, the 3207's, in my mini-me, both worked but the lettering seems to have vahmoosed off the 1 chip but swear I saw it when I took it out of the static bag. I don't have e proper pork barrel or similar CE1/2 clone to test the 3102's but the printing is still sharp after rubbing my calloused thumbs over them. Would be nice to have a breadboard test method since I currently lack a pork barrel or ppcb's cephied to stick them in.
Best way is to put them in a circuit you know works.
[/quote]
Agree. These BBDs and associated Clocks should be plug and play. Not too much to them. If the circuit works, simply remove the Clock or BBD and replace with suspect IC. Much of the "problem" is verifying that the circuit is 100% working prior to using it as a test bed.
Quote from: Govmnt_Lacky on August 02, 2022, 07:40:47 AM
Best way is to put them in a circuit you know works.
Agree. These BBDs and associated Clocks should be plug and play. Not too much to them. If the circuit works, simply remove the Clock or BBD and replace with suspect IC. Much of the "problem" is verifying that the circuit is 100% working prior to using it as a test bed.
Yeah, this is definitely the place I am trying to get to. I have no reason to believe that my Caesar Chorus will not work with the proper ICs but I also can't
prove that will work currently. I will say that the LFO was not working with the original chips in the circuit but when I pulled them out and tested it the LFO came to life.
QuoteHow're you determining they're fakes?
test in a circuit with a zip socket.
As suspected some new ICs brought everything to life. Seems to be working great now. Got to make some time to figure out weather it was the BBD or the clock that was the trouble now. Or just chuck them both in the bin lol.