The Skyraider SR-30 features a 12AX7 tube operating in a parallel triode configuration for the preamp. Running the dual triode sections of the 12AX7 in parallel produces higher gain than a single section and lower noise than cascading one section into the other.  It also produces very warm tube tone. Another 12AX7 serves as the phase inverter and four 6V6s make up the power amplifier producing about 30 watts of power.

   The SR-30 features solid-state rectification.  This means that devices called silicon diodes convert the incoming alternating current power into the direct current power the rest of the circuit needs. Many vintage and boutique amps use tube rectifiers because they produce desirable ‘sag’.  Circuitry downstream of the SS rectifiers in your Skyraider does the same thing.  You avoid the extra cost of tube rectification and the additional heat produced by the rectifier tube.  You get sag that is indistinguishable from a tube rectifier set up.

   A volume control and single tone control reside between the preamp and phase inverter.  The tone control rolls off high frequencies to voice the top end of the amp. The lack of bass and middle tone controls restricts the amount of tone shaping, however it also reduces signal loss inherent in passive tone controls.  The fewer passive controls in the signal chain, the larger the signal getting to the phase inverter and on to the power section.  This is a key factor in the Skyraider’s ability to produce more volume than expected from an 30-watt amp and to drive the power amp into the crunch and distortion zone.