Vacuum Tubes

The TAD 6V6GT-STR Redbase combines the tonal characteristics of an NOS 6V6GT such as from RCA or GE with the current requirements. It is a heavy duty 6V6GT tube, which can handle a higher plate voltage than regular 6V6GT tubes. The TAD 6V6GT-STR Redbase shines with the typical NOS "sweet top end" and at the same time a strikingly dense and complex midrange. Especially with this midrange characteristic they achieve a liveliness in tone that only NOS 6V6GT achieve and otherwise remains unmatched. Even when pushed into saturation there are no harsh upper mids, which is frequently the case with other 6V6s. Sweet full-bodied tone with silky highs. Tube Amp Doctor recommends the TAD 6V6GT-STR Redbase for all 6V6 power amps when a full yet freely defined tone is desired. The ideal tube for Fender Deluxe Tweed 5E3 or Blackface Princeton Reverb amps, single ended Class A amps like the Fender Tweed Champ, Vibro Champ, Fender Champion 600 or the Univalve.

The Tube Amp Doctor EF86 / 6267 is a low noise and low microphonic version of the vintage pentode. These tubes were famously used in classic HiFi equipment and microphone preamps. The original Vox® AC15 circuit also used an EF86 and now, thanks to its recent availability, there are plenty of options for guitar amplifiers utilizing this unique tube. The TAD EF86 / 6267 meets all of the standards of the Tube Amp Doctor Premium Selection process. This tube has a rugged construction featuring an aesthetically pleasing perforated shield. The TAD EF86 / 6267 will work in and EF86 or 6267 position.

Electro-Harmonix 6973 Power Tube Beam power amplifier used in vintage Gretsch and Magnatone amplifiers. This is a real 6973, not a rebrand of a "close" tube.

The 6BM8 contains both a power pentode and triode. It has a pentode plate dissipation rating of 7 watts with convection cooling.

Sharp cut-off general purpose amplifier. With the exception of heater and capacitance ratings, the electrical characteristics are similar to those of the 6C6.

Beam power amplifier tetrode designed for use in the output stage of radio receivers or other equipment requiring high power output, power sensitivity and efficiency.

Triode, high mu

Compactron beam-power pentode primarily designed for use as the horizontal-deflection amplifier in color television receivers. It is characterized by having a very low knee with a very high peak current of over an ampere.

Miniature, medium-mu twin triode designed primarily for use as a vertical-deflection amplifier in television receivers. The two sections may be employed in parallel, or as a combined vertical-deflection amplifier and vertical oscillator.

Pentagrid converter designed for service as a combined oscillator and mixer in AC, storage battery, and AC-DC operated receivers

High vacuum rectifier intended for use in full-wave applications. The tube incorporates an indirectly heated cathode which is internally connected to the heater

High perveance beam power pentode in a T-12 glass envelope. It is designed especially for use as a horizontal-deflection amplifier in color television receivers. The 6CB5A is unilaterally interchangeable with the 6CB5.

Pentagrid converter

Ruggedized heater-cathode type double diode using the 9 pin miniature construction. It is suitable for use in half or full wave rectifier applications or as a voltage doubler.

The 6GM5 is an audio power amplifier

The 6L6 is designed with high power sensitivity and high efficiency for service in the output stages of AC receivers. They are capable of delivering an output at all power levels with a very low percentage of harmonic distortion.

Cathode type high vacuum rectifier designed for full-wave applications. The cathode is connected internally to the heater.

Filamentary full-wave high-vacuum rectifier designed for use in the power supply of a-c operated equipment

Filamentary twin-diode designed for full-wave rectifier operation in power supplies that have D-C output current requirements up to approximately 125 milliamperes.

Full-wave vacuum rectifier.

The JJ Electronic 7027A offers the same reliability and tone as the JJ 6L6GC but with the correct pinout for vintage amplifiers that use 7027 tubes like older Ampegs. At 30W, this tube delivers plenty of headroom. The highs are clear and responsive with warm mids and tight solid lows. Known for their reliability and articulation, the JJ 7027A is a great option guitar amplifiers and Hi-Fi stereo equipment.

The Tube Amp Doctor 7025 / E83CC Highgrade is the premium selection of the RT003 ECC83-Cz for V1 positions. This tube works exceptionally well in the V1 position of high gain amps, combo amps, and phono/audio-amps. The Tube Amp Doctor 7025 / E83CC Highgrade is a miniature, high-mu twin triode with good gain, round deep bass, somewhat compressed mids and very smooth top end. Selected and recommended for guitar amps to smoothen up the tone or for HiFi to shape the body of sound more to “that” tube tone. Best for jazzy and thick clean as well as for vintage bass response. The TAD™ 7025 / E83CC Highgrade can replace any 7025, 12AX7WA, 12AX7WB, 12AX7LPS, 12AX7EH, ECC83 or E83CC.

The all-new TAD 7025 / E83CC Redbase Highgrade is carefully selected for all the demanding gain stages in any guitar or headphone amp, tube microphones or the extremely sensitive phono preamp-positions in audio amplifiers. Tonally, this tube produces fine, airy, silky and pleasant highs, a complex and dense midrange with clarity and definition in the low end - providing maximum smoothness and zero microphonics. Great warm cleans and creamy overdrive. Fine, unobtrusive highs, complex, dense mids and clear real bass. Selected for demanding applications for maximum smoothness and zero microphonics - even with very sensitive input stages of high-gain amplifiers.

General purpose triode designed for service as an oscillator, detector, or amplifier