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Results 1 to 21 of Thread Tools Show Printable Version. Original Peavey part number is and the industry equivalent is CA Peavey replaced the original part with LMN but that is now obsolete also. Anyone know of a datashert substitute?
To be specific about its role in the circuit, datasheeg needs to replace U15 in a Peavey Mace preamp. Attached Files Mace VT. Originally Posted by km6xz. Is it the same as CA? I have two of them at home but it may be easier to buy it here: I realize that, but they are in critical roles in the preamp.
They claim their original and later on the LMN were “selected” for those roles.
I just got off the phone with Grant Brown and he reiterated that same position but also added “the recipe we used to select those OTAs has been lost. So, I don’t know if those chips will work or not. I had already seen those in your eBay link, but I’m not confident enough to purchase until I can get some further expert advice based on personal experiences with subbing for these chips.
I also heard such stories about “specially selected” golden chips from respected manufacturers and after that I found out that the chip is noting more than plain NE So you may believe, or not – it’s your choice. That ebay item is from China. I don’t buy any obsolete components from there. These may be legit, especially if they are used: Originally Posted by The Dude. But, I did learn something. There are protons, neutrons, electrons, Originally Posted by MarkusBass. Originally Posted by g1.
(PDF) CA3094 Datasheet download
Originally Posted by nosaj. An OTA is not “just a “. Look at the data sheet, it is an op amp with an ca30944 transistor.
We have two threads on this amp now? I suggested elsewhere that while it was more critical in the phasor, it wasn’t elsewhere in the amp. You got the phasor working, now replace the les criticalone you stole. They could just as easily left everyone datashert. Education is what you’re left with after you have forgotten what you have learned. Originally Posted by Enzo. I actually researched that once. If you look at the data sheets for CA and CA, they aere similar enough that one would work for the other unless a certain feature was used.
And in that also where it mattered. Grant is a good guy, but I suspect, like me, he’d have to do the same research again to come up with an answer. Originally Posted by Tone Meister. Ordered a couple from each source, thanks guys. Anyway, here’s hoping they work and that I now have some spares catasheet hand. We have seen such things elsewhare, specially in the Audiophoolery world, but Peavey is a solid feet on datashheet ground type of company, when they say specially selected I believe them, in this case being equivalent to “matched power transistors”, “selected for low noise Op Amps or transistors”, etc.
Datazheet at the Peavey schematic, I see that: Since there are no trimmers or presets to adjust gain or threshold, I imagine this circuit needs selectedprobably with transconductance within a certain range, to work “just right”.
Lab Series amp L5 uses a similar OTA circuit, but they made it adjustable, as in “inject xxx mV audio at the input, adjust output trimmer to 1. Problem is that such adjustment instructions are not datashewt or applicable here, but much worse, not even Test Point voltages are shown.
If needed, you can increase C3094 gain increasing R86 or decreasing R85 so it roughly matches the other channel, built around U Originally Posted by J M Fahey. Peavey publishes a master semiconductor catasheet with all their house numbers. They have very few selected parts, but the ones they do have usually matter.
CA datasheet & applicatoin notes – Datasheet Archive
Marketing BS usually only happens with parts consumers would buy, like tubes or speakers. That wouldn’t be their style anyway. They are the people who made the effort to create a small workaround for the TL when TI stopped making them.
An example is certain transistors of common type, but sorted on a curve tracer for a voltage characteristic needed in a particular circuit. The selected part is given a different part number from the common part. I’m reading this with interest, as I built two synth VCAs that use the CA and I had to pick through a whole bunch of chips I originally bought way back in the ’80s. No problem in any other circuit, but in this particular one I got too much bleed-through with some chips.
Yeah, I’ve learned a wealth of info by repairing several issues with that amp. The different odd chips and the lack of suitable substitutes are definitely most interesting, the workarounds Enzo and Juan shared even more so. Original repair thread is here: This may already be understood by those here, but note that, while they perform largely the same action as OTAs, the and are NOT the same chip and do not have the same pinout.
The closest thing to astill in production or recently enough is the LM and Note that this is a pin chip containing the functional equivalent of two s. One could, in theory “dead bug” them as viable replacements if the exact replacement can’t be sourced.
Substitute for CA/LMN OTA
EHX also used the in many products. Their in-house part number was EH Get it while you can. Superb, and good bedtime reading. Just the kind of book Enzo should write.
By LeftyStrat in forum Guitar Effects. Bookmarks Bookmarks Digg del. The time now is