Wadley loop design
Transistorised H.F. communications receiver.
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Based on historic data, today's value of the Racal RA-1217 might be around:
Beeing a ham radio operator for over 30-years and having a lot of HF receivers to compare,I must say that it wasn't a best Racal product.Rather noisy,low IP3 .Stability is good thanks to Wadley loop.The designers from Racal have tried to build a transistorized version of RA-117,but it wasn't the same as this great tube rig !.For example RF input is a typical bipolar transistor... I sell my RA-1217 quicker then I bought ;-)