I just looked at an RE magazine from late 1970--my set is there. Looks like a GR_270, 20 inch version. it DOES use a v-out transformer, and a TO-3 transistor mounts on the chassis right above it. is your chassis like this.
Also--the A-out transistor is on the left, above the power tranny, there are a pair of transsitors, but I do NOT think both of them are for audio.
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