Quote:
Originally Posted by DavePlaysBass  The TI chip is a drop in replacement for the LM4250 as you found out. However it does not work the other way around.
EDIT: I am not aware of the Philips chip. I cannot find a proper datasheet for it, but I suspect it was their version of the LM4250. |
ECG was a line of replacement semiconductors that was marketed as a subset of the Sylvania line. Best I remember, the designation "ECG" stands for Electronic Components Group and was first used in the late 1960s. The ECG line was quite extensive, offering off-the-shelf replacements for literally hundreds of thousands of transistors and ICs.
The assets of ECG, held by Philips Electronics, were acquired by NTE in 2001 and the numbering conventions used by ECG were retained. In
most cases, ECGXXX will be the same part as NTEXXX. In this case the ECG944 (which is, in fact, a generic replacement for LM4250) would now appear on a parts counter as NTE944.
As a tip, should you ever be in an emergency situation, LM741(which can be found at most Radio Shack locations for 99 cents) can work in place of a blown LM4250. The more modern op-amps have lower noise and better gain characteristics than older parts like the 741, but a spare in the case can help get you through the gig if you can't find 4250s in your town.
Anyone have a schematic G&L 1505 
