Dynaco PAT-5 Stereo Preamplifier (1974 MSRP $239 Kit, $399 Built)
Dyna's replacement for the venerable PAT-4, adding such niceties as a high-power switchable outlet, speaker selector and terminals, dual tape monitors, an external "processor loop" intended for EQs or other signal modifiers, and an op-amp high-level stage. The BI-FET term is a trademark of National Semiconductor for the JFET LF357H IC used in the PAT-5 BI-FET version. This replaced the NS LM301 opamp in the PAT-5 preamp in 1977, opening the door for numerous audiophile mods including the highly acclaimed Frank Van Alstine and Walt Jung upgrades.
Semiconductor complement: 13 transistors; 2 integrated circuits; 3 zener diodes; 4 diodes.
Dimensions: 13-1/2" x 4-1/4" by 11-3/4".
Power Consumption: 12 watts, 120V or 240V, 50/60 Hz AC.
Shipping Weight: 13 lbs. (5.9 kilos)