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Ampeg positioned the SVT-3PRO as a rackmount bass amplifier head within its SVT Pro series, designed to deliver tube-driven tone in a format suitable for rack-based rigs. The unit produced 275 watts into 8 ohms and 450 watts into 4 ohms, pairing a tube preamp section with a solid-state power amplifier stage.
The preamp ran three 12AX7 tubes, supported by a driver stage using one 12AX7 and one 12AU7. Tone shaping centred on a 3-band EQ with a 5-position midrange frequency selector — offering centre frequencies of 220 Hz, 450 Hz, 800 Hz, 1.6 kHz and 3 kHz — alongside a 9-band graphic EQ and Ultra Low and Ultra High boost switches. The graphic EQ carried a footswitch function, allowing it to be engaged independently as a secondary EQ configuration during performance. A balanced line output offered pre- or post-EQ signal selection, a ground lift and level control. Additional connectivity included an effects loop and separate preamp output and power amp input jacks. The unit occupied a standard 2U rackmount footprint, measured 19 × 3.5 × 15.5 inches, and weighed 26 pounds.
For tube replacement, impedance matching, or signal-chain troubleshooting, a qualified guitar or bass amplifier technician will be best placed to advise on compatible components and correct operating procedure for this unit.
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The catalog shot showed one finish, under one light, a long time ago. Yours has been played. Photos from owners are what the next person finds when they are trying to identify a part, match a finish, or work out whether the one they just bought is really what the seller said it was.
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From spec questions to full builds — players who have lived this gear since 2007.
Since 2007
