Enlightening!
Worth further investigation... it's a single SIT transistor amp and the four glasswares are light-bulbs, used as resistors in circuit, NOT tubes!
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Pass is now designing power amps based on the new SIT (static-induction transistor), a variation of the JFET (junction field-effect transistor) and MOSFET (metal-oxide semiconductor field-effect transistor) fabricated from silicon carbide. Originally developed for radar applications, the SIT turns out to be ideal for audio amplification, providing the closest thing to triode-tube characteristics without the vacuum.
Pass is now designing power amps based on the new SIT (static-induction transistor), a variation of the JFET (junction field-effect transistor) and MOSFET (metal-oxide semiconductor field-effect transistor) fabricated from silicon carbide. Originally developed for radar applications, the SIT turns out to be ideal for audio amplification, providing the closest thing to triode-tube characteristics without the vacuum.