PNP or NPN TR1 in the Quad FM2?
The answer seems to be that the Quad FM2 circuit diagram is wrong and the device TR1 should indeed be shown as NPN to agree with the datasheet and the electronics. TR1 has a collector voltage more positive than its base voltage, and receives a positive base voltage to turn it on, so it is clearly an NPN device.
Possibly the mistake arose in the drawing stage because the AC187 is a germanium transistor, which are usually PNP.
However we advised our customer that the fault was most probably in the lamp itself rather than the transistor. The lamp is a standard type still available today, or can be replaced with a yellow LED in series with a small resistor.
Dada Electronics Australia specializes in the Quad FM tuners, for repairs, renovations, and RF/IF/MPX alignments. See the Dada Australia web-shop http://stores.ebay.com.au/dada-australia.
Dada Electronics Australia