Old rigs of s.k. Eltje PA3CEE here for check and repair The rig's looked like they have been working in a brown cafe for years He was a real smoker ... the "tank" FT902DM very heavy rig permeability tuning very well build equipment. Plug-in modules. The standard twin 6146 PA seen in most most older transceivers until 30 years or so ago shown under power with filaments on. Dangerous be aware ! 950V and 350V are also present at the ACC backside socket for external use In the age of SSPA used to low voltages where touching a working circuit is safe. Working with high voltages is extra dangerous nowadays. The socket board of the PA the brown C looks high-quality is a known issue of the FT902. This 100pf /1kV is to separate 350V 12BY7 driver ANODE from the delicate 6146 grids -100 150 ! practical a wire direct from the driver anode is leadingto this C1 If shorted the PA wil blow the fuse shortly after the heaters are switched in
Ham radio in JO33hg31 53.15N 6.35E