[PJL]

I ended up winding 5000 primary and 15,000 secondary of the thicker wire I had and there was still plenty of room left. After a complete strip down, clean and reassembly following the kit instructions, the MM4 is now working very well. The set came with some spares and included 3x S215, H210, HL210, LP2 and PM254 but unfortunately, 2x S215, the H210 and the PM254 all show low emissions (very low anode current). I am using a 6" speaker and an RS miniature output transformer and it sounds as good as any MW receiver, and I only made one error in reassembling the reaction control 1/4 turn out.

These early radios work surprisingly well and the valves are normally pretty reliable so it is unusual to find so many that are weak.