JHL Class A headphone amplifier earphone pre AMP kit $26.99 6463 GENERAL ELECTRIC HEADPHONE AMP TUBE $29.99 Vintage NOS Marconi 6V6G 6V6 G Coke Bottle Audio Amplifier Headphone Power Tube $50.00 Mini dual tube headphone amplifier kit / fully inclusive electronic kit $149.00 2 MATCHED NOS MULLARD GOLD PIN E88CC 6922 6DJ8 for DAC [...]