[old_tv_nut]

Tantalum caps can be useful for their small size, BUT they degrade permanently and fail if they are EVER reverse biased. So, typically used only for bypassing power to ground, not as interstage coupling or waveform generating components, where the voltages on either end can rise at different rates during turn on.

Safest thing in restoring old gear is to replace electrolytics with electrolytics.