I recently acquired an Atlas 210x. This was one of the first fully solid state ham transceivers from the early 70s. It had no audio output. Using a scope I narrowed this lack of audio down to the output amplifier, an LM380. I replaced the LM380 with a NOS one I got off ebay (major suppliers either had a long lead time or minimum purchase limits that made this cheaper). This caused me to get SOME audio output, but it appears to be incorrectly biased, which is weird since the LM380 is internally biased. The output waveform is chopped off at the bottom and only shows tiny tips of the sinewave output with a line at the bottom. The DC voltage on pin 8 output is about 1.8V, whereas the voltage chart says it should be about 5.2V. The input waveform is relatively clean, and sounds fine if I drive it into an external audio amp. My first guess and Ockham's Razor would suggest the replacement LM380 is bad or got too hot when soldering it in. It gets soldered to the ground plane for heat sinking purposes and takes a lot of heat. I probably should have waited a few minutes between soldering each pin. You can see the schematic attached. Note the cap indicated with magenta is not present on the board (maybe a revision of PCB). I tried adding the 0.1 uF cap from pin 14 to ground as suggested in the Lm380 App notes. This is for decoupling to reduce oscillation. However, my waveform didn't look like oscillation; it looks chopped off, like incorrect bias. This additional cap had no effect. The input signal to the LM380 looks OK on the scope and sounds OK going into another audio amp. I had replaced C316 the 2.2uF on pin 6. So that is new. C317 checks out on an LCR meter. C315 has also been replaced with a fresh cap. I have ordered some more LM380 chips. I am guessing this is the issue, but any insight is appreciated. Also, are MLCC caps acceptable for audio coupling caps (e.g. C311)? I will probably swap it out for a film cap, but the little MLCCs fit better. (I know that MLCCs reduce their capacitance as their voltage approaches their rated voltage, and thus they should be overrated in terms of working voltage.) Thanks in advance.