Nice 70's vintage genuine British made Brimar CV4055 ( 6CH6 EL821) pentode amplifier tubes with adapters to use directly in place of EL84 tubes, an effective way to get British NOS quality without the expense of NOS EL84 tubes.
All of the tubes are in the original Brimar factory boxes and are guaranteed. EL821 is a output power pentode with ratings and characteristics very similar to EL84, but with a different pinout.
The price is PER TUBE + 1 ADAPTER. This item is shipped from Britain, in North America or Asia please allow 2 to 3 weeks for delivery.
These are tested for plate current and transconductance at normal operating voltages on a high precision AVO VCM163 tube tester.
Available as matched pairs for £2 extra each.