josephazannieri wrote:Yo 4HF'ers:
Has anybody got a working 4HF? Seems to me the answer is to stick in an ohmmeter and just measure the resistance of that rheostat, from end to end. The center pin is the wiper, which may be anywhere along the resistance element. This will give answer if we can't find a schematic. Perhaps our helpful old friend LPfan from Mumbai? Last we heard from him, he had a 4HF that was tracking at 2 grams. Cool!
And good luck from the old delegator, ("see you later, delegator?")
I've got three 4hf's two are just for parts. I use the Shure M44-7 cartridge and although I can get it to track as low as 1.5 grams I prefer it to track at 2 for home use and 3 for club use. To get it to track at under 2 grams I use a sticky weight as a counter balance it is the same weight which is used for wheel balancing when you get a new tyre fitted(Not the clip on type). If it is placed on the flat side at the back of the arm it is hardly noticeable and it sounds nice.
I had a look at the rheostats in the pitch control on two of the 4hf's, one is 2.5k ohm's(American power) and the other one is 10k ohm's(UK power). I'm going to have ago at building a new pitch control, but I'm not sure what the voltage drop across it is so that I can work out the power being dissipated across it.
Does anyone know what the power rating of the rheostat is or how much voltage is being dropped across it?