Johannesburg - Allied Electronics Corporation said on Friday that Powertech's Aberdare Cables has continued to experience difficult trading.
This was blamed on the depressed state of the building and construction sector and pricing pressures.
Altron's update followed its financial half-year results in October.
"It is evident from recent economic data that industries exposed to this key sector continue to face extremely challenging times with few signs of recovery being seen, particularly in the domestic residential market," Altron said.
It noted that the remainder of Powertech's operations had traded according to group expectations, with Powertech "well positioned to capitalise on future growth opportunities when the markets turn".
It said that Bytes' trading conditions and markets had not changed significantly from previous reporting.
"Consequently, Bytes is trading in line with our expectations," Altron said.