ST-70 Output / Power Tubes
EL34 Mullard Power / Output Tubes (matched Quad)
Sold Only in Quads, (4) Tubes - Apex matched set. Use the Mullard EL34 in the output stage of the Dynakit / Dynaco ST-70 and MKIV tube amplifier. Premium high-voltage power pentode. An extremely faithful reissue of the XF2 Mullard EL34 from the 1960s. Special grid windings give a unique sound. Perfect power tube for Dynaco ST-70 and MKIV Tube Amplifiers
EL34 Electro-Harmonix Tubes (Matched Quad)
Sold Only in Quads, (4) Tubes - Apex matched set. Use these EL34 Electro-Harmonix Tubes in the output stage of the Dynakit / Dynaco ST-70 and MK IV tube amplifier. Superior imaging and depth, fantastic realism and holographic presentation. Superb bass response.
KT77 JJ Electronics Output Tubes (Matched Quad)
Sold Only in Quads, (4) Tubes - Apex matched set. Use the JJ KT77 in the output stage of the Dynakit / Dynaco ST-70 and MK IV tube amplifier. This tube has an extended frequency response with exceptional lows (even deeper than the E34L's) and wonderful highs. Midrange is smooth, extremely rich with harmonic complexity.
6CA7 "Big Bottle" Electro-Harmonix Tubes (Matched Quad)
Sold Only in Quads, (4) Tubes - Apex matched set. Use the EH 6CA7 in the output stage of the Dynakit / Dynaco ST-70 and MK IV tube amplifier. Electro-Harmonix 6CA7 Vacuum Tube Big bottle beam-tetrode version of EL34.
EL34 KT77 Genalex Gold Lion Power Tubes
Sold Only in Quads, (4) Tubes - Apex matched set. Use the EL34 KT77 Genalex in the output stage of the Dynakit / Dynaco ST-70 and MK IV tube amplifier. Detailed imaging and depth with lush realism and a strong holographic presentation. Excellent bass response.
ST-70 Rectifier Tubes
5AR4 / GZ34 (U77) Genalex Rectifier Tube
Sold as each. Works in the Dynakit / Dynaco ST-70, MKIII and MKIV Tube Amplifiers. Genalex Gold Lion U77 / GZ34 full-wave rectifier tube. A highly rated indirectly heated dual diode, full-wave vacuum rectifier. This tube insures a strong, dynamic response. Excellent sound and a reliable choice, the Genalex U77/GZ34 comes with a dark blue base. It has a stable tandem supported getter cup, industrial thickness dual mica spacers and full 30mm length internal plate structures.
5AR4 / GZ34 Tung-Sol Rectifier Tube
Sold as each. Pre-tested and burned in for quality assurance. For use in the Dynakit / Dynaco ST-70 and MKIII or MKIV Tube Amplifiers. Tung Sol 5AR4 rectifier tube is a premium grade directly heated heavy duty rectifier Diode. Helps extend the life of the other valves in the amplifier by allowing them to heat up before plate voltage is applied.
5AR4 / GZ34 Solid State Rectifier
Works with the ST-70, the MKIII and MKIV Amplifiers. This custom made "Copper Top" Solid State Rectifier works great. Plugs right in the socket like a tube. Includes a protective "soft start" just like a regular 5AR4 / GZ34. If you're changing from a glass tube to this solid state rectifier, your amplifier will require adjusting / re-setting the bias, as bias will typically be slightly higher with this SSR, due to it being more efficient than a vacuum tube. Reduces transformer load, runs cooler, increases bass response and improves speaker damping.