[DonaldStott]

Before going any further I need to answer one key question - the K-B MR10 has a waveband/gram switch and page 3 of the Service Sheet 1233 has details of the Switch Table and Diagrams.

I can't really make much sense of this or properly view the waveband switch units from the end of the inverted chassis??

From the MR10 schematics on Mike's (crackle) helpful KB museum web site it says "Turn clockwise for FM-LW-MW" so I am assuming that turned fully anti-clockwise is the Gram position??

Can someone confirm which switch positions to find Gram, FM, LW and MW.

Hope someone can help?

Meantime with all the valves in place and the loudspeaker reconnected I re-measured the Rectifier voltages but unsure as to which waveband I was on: -

207V A.C. (Service Sheet lists 225V A.C.)

184V D.C. (Service Sheet lists 185V D.C.)