BA-3 Preamp Fairchild/Toshiba 500 ohm 1K ohm pot question:

[Russellc]

As we have seen, those using the Fairchild mosfets on the BA-3 FE board has required using 1K pots in the place of the 500 ohm pots used with the Toshiba mosfets.

I just got ready to solder in my 500 ohm pots, (P1 and P2) and noticed I had inadvertantly got the pots with the adjustment screw on the wrong side. I could make them work, but it would be a pain to adjust, so I will just order up some ones with the adjustment on the top.

However, (and my question) I do have a number of 1K pots that would work, but will these work with the Toshiba pots? Does the 1K pot just give more range needed for the Fairchild mosfets, or would it be a problem with my Toshiba mosfets?

If no one is sure, I will just get the correct 500 ohm parts rather than do a bunch of resoldering, not that big of a hurry! Has anyone tried 1K pots with the Toshiba FE mosfets successfully?

Thanks in advance,

Russellc

 

[Zen Mod]

1K will just give you half of setting range

put 1K resistor across them , to fake 500R ones

it'll work as charm

 

[Russellc]

I guess I could put that on bottom side of board across the two legs on outside edges of pot, keeping legs long enough on back side of board to solder resistor to.

Thanks,

Russellc

 

[Zen Mod]

yup

 

[wdecho]

1K will just give you half of setting range

put 1K resistor across them , to fake 500R ones

it'll work as charm

Good thinking!

 

[Zen Mod]

well , always when I'm thinking , I'm doing that good

 

[Russellc]

Yup.