I have some Ampzilla driver boards with original transistors date coded 1977.
I believe this make these boards the second board out as the kit was made a few years before this.
So, my memory has gone to hell and I simply cannot remember which bias IC it
needs to function. Do I need the CA3086 with this version or the MPQ6001?
I believe this make these boards the second board out as the kit was made a few years before this.
So, my memory has gone to hell and I simply cannot remember which bias IC it
needs to function. Do I need the CA3086 with this version or the MPQ6001?
Attachments
Same pin out on both the CA3046 and the CA3086 and I know I have used the CA3086 in the past and the Ampzilla is still running. Both have diff pair transistors at pins 1 thru 5. The only thing I can tell is that maybe the other three transistors aren't matched quite as good on the CA3086.
Anybody else with information? DJK?
Anybody else with information? DJK?
I have attached engineering data for evaluation use only.
It shows data on both the CA3046 and the CA3086 IC's.
Since the original GAS IC was marked with a house PN I find it hard to believe that you can say with 100% certainty that they did use a CA3046. The pin out is identical on both the 3046 and the 3086. It is hinted that the 3046 has closer matched transistors for the other three inside the IC.
In checking your prior post you have gone on record saying the Ampzilla used the CA3046 because you checked the pin out. What I am looking for here is 100% proof of what was actually used by GAS. I have old GAS IC's that are marked GAS 100 and GAS 100A. Unless some proof can actually come to life here I'm going to stay with my assumption that the GAS 100 is a CA3086 and the GAS 100A is a MPQ6001.
It shows data on both the CA3046 and the CA3086 IC's.
Since the original GAS IC was marked with a house PN I find it hard to believe that you can say with 100% certainty that they did use a CA3046. The pin out is identical on both the 3046 and the 3086. It is hinted that the 3046 has closer matched transistors for the other three inside the IC.
In checking your prior post you have gone on record saying the Ampzilla used the CA3046 because you checked the pin out. What I am looking for here is 100% proof of what was actually used by GAS. I have old GAS IC's that are marked GAS 100 and GAS 100A. Unless some proof can actually come to life here I'm going to stay with my assumption that the GAS 100 is a CA3086 and the GAS 100A is a MPQ6001.
I remember that thread as I made a few posts on it. Noting in it about the bias IC. Just wanting to put the correct IC with the boards that I am selling on ebay. I thought having the new bias IC's with the boards might make them sell easier.
as i recall from the magazine article, this ic was described as 5 opamps.....some transistors in the package were connected as series string diodes as i remember, while one transistor used as Vbe multiplier....non mission critical component imho....
http://www.diyaudio.com/forums/solid-state/211104-ampzilla-iii-3.html
Post #29
I would say that the cross ref sheet qualifies and it clearly lists the CA3086 as the replacement for the Gas 100 IC.
Post #29
I would say that the cross ref sheet qualifies and it clearly lists the CA3086 as the replacement for the Gas 100 IC.
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I really do not know where your going with this as it makes no sense to me at all. Thanks for the help anyway..........
these ic's are rather old, more than 40years i'd say.....that they are still available today is indeed fascinating......for the targeted application i do not see any issues at all....i will use the type that is most easily obtainable at a reasonable cost...
sometime in the 90's i was given a unit to look at.....and identify the ic used...so i did look at the pcb lay-out and the ca3046 was what came to my mind as i was familiar with that ic(we were using that ic in the controller board of the KnS 478 wire bonding machines in the factory where i was employed as a technician) and we happened to have spares....we used that ic and it worked without issues...
KnS 478 wire bonding machine:
An externally hosted image should be here but it was not working when we last tested it.
The CA3046 will work fine. What I was trying to remember and find out to satisfy myself was the correct IC that was used.
Per the Cross Reference sheet the CA3086 is what was actually used so that is the answer I was looking for and not the pin out of the 3046. Both have the same pin out and both could be used. For reference purpose I believe it is important for others to know what the proper part number was/is.
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