Sophia Electric™ 300B+ Carbon Plate Tube - Double tall plate structure, double power

300B+ = two 300B parallel internally, double the filament current, double the plate current with half of the output impedance.

Option 1: $849.99 per premium matched pair with one year warranty.
Option 2: $749.99 per premium matched pair with 30 days warranty.

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Sophia Electric 300B Plus carbon plate tube
Sophia Electric™ 300B+ carbon plate tube.

Sophia Electric 300B Plus

For U.S. domestic shipment, we use USPS priority mail with insurance -- $20 for the first pair. Express shipping is also available at higher shipping cost.
For international shipment, we either use DHL or USPS express. Please email us your country and city, so we can find out the shipping cost for you.

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