Whites/Savo Beachcomber 5D schematic required

[Gunghouk]

Hi everyone, can anyone point me to a schematic or close relation to the Whites/Savo Beachcomber 5D TR detector? I've purchased a pair of non-working detectors with a spare board and three 4B coils. If I can't get at least one working then I'll use the housings for other builds. Can anyone shed any light on the characteristics expected from good, working coils ie. Inductance and resistance. I believe they are concentric coils and the TX operated at 6.6kHz according to the advertising literature.
Thanks in advance for any assistance.
Regards

[Carl-NC]

The 4B coils were omega-type. There were probably different circuits used, the earlier TR-Disc (1974-75 ish) was all-discrete transistors like the attachment. White's-UK continued making variants of the Beachcomber even into the 2000s but I suspect they used a later opamp-based design. I have no info on what they did, as it was often their own circuit design.

BeachComberSch.pdf

[Gunghouk]

Thank so much Carl that'll help no end. You're the man.
Cheers
Neil