Standard Pins: Sold in quantities of (4) four tubes only. 

Matched Quad - tested and burned-in tubes for maximum stability and performance. This versatile 12AX7 / ECC83S tube sounds excellent, offering an amazing dynamic response while also proving itself with low noise and reduced microphonic issues than other tubes. The warm highs and transparent lows make it the preferred choice for the Dynakit/Dynaco PAS Preamp.

Gold Pins: Sold in quantities of (4) four tubes only. 

Matched Quad - tested and burned-in for maximum stability and performance. This versatile 12AX7 / ECC83S tube sounds excellent, offering an amazing dynamic response while also proving itself with low noise and noticeably less microphonic issues than other tubes. The warm highs and transparent lows make it the preferred choice for the Dynakit/Dynaco PAS Preamp.

Gold Pins:  Sold in quantities of (4) four tubes only. 

A well-balanced tube with strongly defined lows, a rich mid range, and clean smooth highs. One of the best 12AX7's in production today. A very nice choice for the Dynakit / Dynaco PAS Preamp, if you can swing the price.....

Standard Pins:  Sold in quantities of (4) four tubes only. 

Full bodied and bright with a more straightforward presentation. It packs a lot of bite with its higher-than-normal gain.  High gain preamplifier tube with ultra low noise and detailed, musical tone. Unique spiral filament eliminates filament to cathode induced hum common on preamps & amplifiers that use AC on the filaments. Superior high gain short plate format Twin Triode, with ultra-low noise and detailed, musical tone.

Gold Pins:  Sold in quantities of (4) four tubes only. 

Superior high gain "gold pins" Twin Triode short plate with ultra-low noise and a highly detailed musical tone. Excellent tubes for all circuits requiring 12AX7/ECC83 types. Provides Ultra-low noise performance thanks to unique spiral filament which eliminates cathode-to-filament induced hum. Gold plated pins for superior conductivity and corrosion resistance. EH Gold tubes are all new designs and are of excellent quality. Many OEMs use relabeled EH Gold vacuum tubes in their equipment.

Standard Pins:  Sold in quantities of (4) four tubes only. 

Large sound stage with excellent detail. Factory selected for low noise and microphonics. Great for Dynakit / Dynaco PAS Preamplifiers. Premium high gain Twin Triode replicates the sound signature of the large plate Mullard ECC83 tubes popular in the 1960s and 1970s. Large sound stage with excellent detail. Factory selected for low noise and lowest microphonics

Gold Pins: Sold in quantities of (4) four tubes only. 

Very warm, and musical. The filaments are almost completely encased within the plates to reduce noise. The tone is comparable to the best vintage 12AX7s like Mullard or Telefunken. Superb linearity with a dynamic 3-D sound. Well suited for HiFi application

Standard Pins: Sold in quantities of (4) four tubes only. 

A reissue of the original Tung-Sol. The Ultimate 12AX7. Big, warm, and musical. High Gain, ultra-low microphonics, and superb linearity with a dynamic 3-D sound. Improved reissue of the Vintage NOS Tung-Sol 12AX7. Superb linearity with a dynamic 3-D sound. Well suited for HiFi application

Standard Pins: Sold in Quantities of (4) Only 

The JJ Electronic ECC803 standard pin 12AX7 is a superior-grade, long plate tube. The advanced construction of the tube, with its spiral filament and firm plate construction, ensures low microphonics and superior durability. This long plate variation of this tube offers a broader, more even frequency response, with deep bass tones and clear highs, as well as vibrant mid-tones. It’s an excellent selection for Hi-Fi systems.

Gold Pins: Sold in Quantities of (4) Only -

Gold Pins: The JJ Electronic ECC803 is a superior-grade, long plate model of the ECC83 / 12AX7. The advanced construction of the tube, with its spiral filament and firm plate construction, ensures low microphonics and superior durability. This tube offers a lush and broader, more even frequency response, with deep bass tones and clear highs, as well as vibrant mid-tones. It’s an excellent selection for Hi-Fi systems

Gold Pins: Sold in quantities of (4) four tubes only. 

This tube features balanced sections and gold plated pins. Genalex Gold Lion ECC83/B759 (12AX7) dual triode preamp tube. These exhibit a large detailed soundstage that is sought after by discerning audiophiles who demand the highest quality sound. A very nice choice for the Dynakit / Dynaco PAS Preamp.

Standard Pins:  Specifically for the PAS with a Standard Power Supply / Filament Supply. 

Quality brands like RCA, GE, Tung-Sol, Sylvania and others (brand availability will vary)