Where can I find dual and multi-section electrolytic capacitors, high-voltage electrolytic capacitors and electrolytic capacitors with central mounting for tube devices?

For tube radios, vintage amplifiers and many other tube devices, suitable dual electrolytic capacitors, high-voltage electrolytic capacitors and electrolytic capacitors with central mounting are often indispensable. Classic types with 18 mm central mounting are sought, for example, as well as dual versions such as 32+32 µF, 50+50 µF, 3x50 µF or other typical values such as 16 µF for power supply and filtering. Modern replacement types also require the correct capacitance, voltage rating, construction type and clean technical design. For such applications, brands such as Mundorf, JJ and F+T are available from BTB.