I read in sci.electronics.design that ddwyer
wrote (in ) about 'Extracting the
5th Harmonic', on Sat, 27 Mar 2004:

Wayne Kerr used to make a VHF admittance bridge which serves well for
measuring chips, and they can be bought for less than £100 (813? bridge)

You might well be able to extend its frequency range downwards, too.
IIRC, it needs some very small 1 uF capacitors, which simply weren't
available when it was manufactured.

There is an associated transistor test set which is a walking disaster.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk