12BH7 is a medium mu dual triode tube originally designed as a driver in TV sets. 12BH7 shares similar characterstics with 12AU7.
12BH7 is suitable for voltage amplifier amplication from audio to low-VHF frequency range. 12BH7A is a higher voltage version. When in doubt, use 12BH7A.
12BH7 can also handle higher current and power than 12AU7. This makes 12BH7 ideal for use in driver or buffer applications.
Note that 12BH7 draws more heater current than 12AU7, and is not always interchangeable.
Electro-Harmonix 12BH7A is a current production tube manufactured in Russia. It is a copy of GE Grey Plate 12BH7. 12BH7A-EH features long plate boxes for high current capacity and thick glass for lower microphonics.
12BH7A-EH is a drop-in replacement whereever 12BH7 or 12BH7A is called for.
ECC 99 was developed as a driver tube for JJ 300B. ECC99 delivers excellent linearity with very strong drive capability, making it suitable for driver application for DIY audio projects.
ECC99 is similar to 12BH7A, and is a drop-in for most applications. Please note that on some amps, 12BH7A is used in power supply circuits and ECC99 is not a drop-in. If you are not certain, please check with the amp manufacturer first.
The following is NOS and vintage tubes in this category.
Due to the scarcity of some items, inventory will change constantly, so please check back often.
Be sure to check out our NOS terms.
The photos of NOS tubes are representative samples and actual NOS tube shipped may vary. "Various" means we have multiple brands in stock.
12BH7 is a medium mu dual triode tube originally designed as a driver in TV sets. 12BH7 shares similar characterstics with 12AU7.
