Re: Oh No! Not another howler.
ISTR the Quad AM2 instruction book has a diagram and explanation of the neutralising bridge arrangement used around the IF stage- though a modern (then!) screened EBF89 pentode, there was still enough stage gain to make this necessary for consistent performance. This was a set with an RF amp, too- the implication being that a set without RF stage would have placed even more emphasis on IF gain.
Can you imagine the instructions for a modern piece of consumer electronics going into such depth of technical detail? Even the plug fuse is pretty much regarded as forbidden mystique!
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