Description
The Electro-Harmonix 12BH7EH is a medium-mu twin triode designed to serve as a driver tube in hi-fi amplification circuits. Each plate is rated for 3.5 watts of dissipation, giving it the headroom needed for stable, consistent performance in demanding preamp stages.
- Medium-mu twin triode construction suited to driver applications
- 3.5 watts dissipation per plate
- Modern manufacture built to consistent quality standards
This is one of Electro-Harmonix’s current-production tube designs, engineered from the ground up rather than pulled from old stock. That’s part of why so many amplifier manufacturers quietly relabel EH tubes and drop them into their own gear as OEM components. If you’re rolling tubes on a budget without wanting to gamble on tone or reliability, the 12BH7EH gives you a dependable option that punches above its price point. It’s a straightforward swap for anyone maintaining or upgrading a hi-fi preamp that calls for this tube type, and a solid pick if you’re stocking spares for future maintenance.





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