Armstrong 500 Range
Note that the 400 and 500 ranges were very similar. Hence most of the information provided for 500 range items also applies to their equivalent in the earlier 400 range. Much of the info for the relevant sections of the tuner-amplifier also applies to the tuner and amplifier as distinct units
Circuit Diagrams and Manuals related to AudioMisc website.
GIF images of User Manual supplied with Armstrong 525 and 526 tuner-amplifier units.
GIF images of Technical Advice leaflet
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