7308 is generally the highest quality tube in the 6DJ8/ECC88 family. These Amperex tubes have Gold pins. They are designed with low microphonics and low noise. Similar to E188CC.
New Old Stock * New In Box Limited 90 Day Warranty MFR: Amperex (Holland) SKU: 7308-GP-AMP
This Machlett 2C39A is a glass-metal high-mu planar triode with a plate dissipation rating of 100 watts, designed as a power amplifier, oscillator, or frequency multiplier at frequencies to above 2500 megacycles.
New Old Stock * Not available for export MFR: Machlett SKU: 2C39A-MACH
Designed to be used as a radio-frequency amplifier or as a combined oscillator and mixer in VHF television receivers. It my also be used as an audio-frequency amplifier.
New old stock * No longer available for export. MFR: Raytheon SKU: CK5965-MP
Designed to be used as a radio-frequency amplifier or as a combined oscillator and mixer in VHF television receivers. It my also be used as an audio-frequency amplifier.
New old stock * No longer available for export. MFR: Raytheon SKU: CK5965
Designed to be used in class C RF amplifier, oscillator, or frequency multiplier up to 175MC. New old stock * No longer available for export. MFR: Philips ECG SKU: 7558-ECG