19-12-2011, 08:52 AM
The service data says that the two modules are unlikely to cause trouble, but if they do, replacements should be obtained from Ever Ready. Initially I thought that they'd be mystery objects with no data given should they fail, but if fact all the components, (resistors and caps), their values and their connection points are show on the circuit diagram, so they could be replaced if they became faulty, by making up a little PCBs or tagstrips to replicate the modules. Unlike those awful little solid state Mullard modules with their AFxxx transistors so beloved by Roberts et al, at least the Sky Queen2 modules don't contain any active components. You can also check the values of resistors contained in the modules at the connection pins. A neat idea I guess, removing the scop for wiring errors and making for a neat layout.
The problem with early PCBs on valve and solid state radios is that the used an SRBP substrate for the PCB, and the tracks so easily lift off and fracture around valveholder and IFT pins etc. (Roberts still use SRBP crcuit boards, with perforations at the edges when they've made one large board of many PCBs, then snapped off along the dotted lines. Very offensive to the eye!).
The problem with early PCBs on valve and solid state radios is that the used an SRBP substrate for the PCB, and the tracks so easily lift off and fracture around valveholder and IFT pins etc. (Roberts still use SRBP crcuit boards, with perforations at the edges when they've made one large board of many PCBs, then snapped off along the dotted lines. Very offensive to the eye!).
Regards, David.
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
