Tube-Tech PE 1C - Program Equalizer

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The PE 1C is a passive, all-tube EQ, based on the classic PULTEC EQP 1Adesign and featuring a passive EQ section and a high quality op amp. Withthe original Pultec out of production for decades and used examples demandingsky-high prices, the PE 1C is by far the easiest way to achieve this unique andcoveted sound.

The PE 1C low end section combines two separate passive EQfilters with slightly different cut/boost frequencies. When the two sectionsare combined, this results in truly unique EQ curves, often named the “Low EndTrick” and very useful for cleaning up low/mid frequencies.

The high frequency and midrange bands really stand out interms of transparency and clarity, and the PE 1C is broadly regarded as one ofthe world’s finest passive tube based equalizers.

History and Details

“The Tube-Tech program EQ PE1A is exactly the same as Pultec program EQ!”

This was our message when promoting the very first Tube-Tech equalizer backin 1985.
The Tube-Tech PE1A program equalizer was originally made as a European exactequivalent of the US Pultec program eq EQP1A, that became very popular inthe US during the eighties in recording studios in New York and LA. The smoothsound of the Pultecs made these eq”s very different and attractive.

The challenge of this illusive sound motivated Tube Tech founder anddesigner John Petersen to design and manufacture something that sounded justexcately the same, featuring equal specs for all components .

The magic test was mixing with Pultec EQ1PA on the left channel and TubeTech PE1A on the right channel and check the stereo image: It had to remainperfect on all settings!

The PE1A was the first product carrying the TUBE-TECH name 28years ago.

Features and Technical Specifications

The TUBE-TECH PE1C is a passive tube based program equalizer based on thedesign of the old PULTEC EQP1A, featuring an all passive eq section and ahigh quality op amp. All components used are of the highest standard.

The TUBE-TECH PE 1C Program Equalizer contains a low frequency boost andattenuation section (shelving), and a high frequency boost section (peaking).The high frequency section has variable bandwidth as well as attenuation(shelving). The filter section is of the passive type followed by a tube basedpush-pull amplifier to restore the gain.

Input and output are transformer balanced as well as fully floating. Inputand output transformers come with a static screen between the primary andsecondary wirings.

• Tube based push-pull amplifier
• Freq. resp. @ -3 dB: 5 Hz – 40 kHz
•  Low noise: < -85 dBU @ 0 dB gain
•  CMRR: > 60 dB @ 10 kHz
• All-tube passive EQ
• 4 LF frequencies: 20, 30, 60 and 100 Hz (Boost: 0 to +14 dB, attenuation: 0 to -18 dB)
• 10 HF boosts with variable bandwidth: 1, 1.5, 2, 3, 4, 5, 8, 10, 12 and 16 kHz (0 to +18 dB w/ sharp Q, 0 to 10 dB w/ broad Q)
• 3 HF attenuations: 5, 10 and 20 kHz (0 to -18 dB)
• Input impedance: 600Ω
• No insertion loss
• Clickless In/Out switch
• Conductive plastic potentiometers
• In- and output are transformer balanced and fully floating