11-04-2017, 06:44 PM
The deck is actually a 4SP, not 4HF (apologies for the error), and runs quite well apart from a slight 'bumping' noise, which is almost certainly due to the idler wheel. I've now found a circlip which is a bit of a tight fit, so may look for a more suitable one. In the meantime, having found that, in the past, someone had fitted what appears to be a version of those Chinese Ceranic cartidges to the detachable headshell, by gluing it inside the fixing bracket from a BSR Turnover cartridge, leaving the t/o knob and 'flag' in place. So far so good. The deck can, and does play both mono & stereo records OK, but two things are puzzling. One is that the BUSH SRP30C in which this deck is used has an output socket for stereo. The pickup is wired so that the RH channel signal goes to the internal amplifier, and the LH sig. to the 'Stereo' socket, which looks like a 75 ohm TV aerial socket (it's original, Btw). The replacement cartridge had it's LH Channel + terminal wired to the internal amp., and LH - to the stereo socket, with no common return wire in the detachable head. Funnily enough it played OK that way, but I've rewired it so that the -ve terminals of the two channels are connected to common neg. The other thing is that, no matter how I adjust the set screw at the rear of the arm, I cannot get a tracking weigh reading at all on my trusty Garrard SPG pressure gauge, which I've checked with it's supplied 5gram test weight. The PU as described has been tracking record alright, but I dread to think at what stylus pressure. The headshell with cartridge, etc., as described weighs about 56G, which may be lighter than with the original Garrard Cartridge. Any suggestions as to how to remedy the tracking weight problem are welcome. Those Chinese Cartridges track at about 2-4 g, IIRC.
