|Replacing Standees Resistors|
Sent: Tuesday, 11 January 2000 11:37
Subject: Standee resistors
I've just had reasonable success repairing the 100r in the center of my Stereo 50.
I used the original ceramic tube and mounting clamp, with new contents.
The seals at either end were recreated using Holts car exhaust sealing paste,
which withstands the high temperatures (1000c).
The resistors I have recreated using a pair of wirewound 47r obtained
Farnell. They are supplied in a square ceramic tube, which needs to be
carefully removed. Collect the sand! The pair of resistors need to be
connected in series as the original, with some sort of clamp - no solder
because of the temperature.
The device will have a resistance of 94r +/- 5%, equivalent to 100r +/- 10% (almost).
Seal one end of the tube, insert the resistors, fill with sand (I collected
mine from old resistors as it is probably special)and seal the other end.
Allow the sealant to harden, then create loops with the leads to solder to.
I have another to repair, the dual 440r from my Stereo 60. This has shattered
the ceramic tube and I' have lost one of the bits. I plan to use an old
television part to aid this repair, a wirewound resistor on a ceramic tube! I
have removed the wire and coatings and the tube has cleaned up well. It is
almost the correct diameter, but the clamp may need adjusting.