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Mullard

2x Mullard E88CC 6922 D-getter Pinched Waist - Heerlen, NL 1957 7L3

2x Mullard E88CC 6922 D-getter Pinched Waist - Heerlen, NL 1957 7L3

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Soundlumia's Opinion

This is not a listing about audio tubes but an invitation to hear the the sweetest voice on Earth. Yes no other tubes can deliver vocals like the Mullard's, whether they're from Blackburn, Mitcham, or Heerlen, and that's a fact. The Mullard labeled and Holland made E188CC tubes are extremely hard to find today and are being hunted to extinction by audiophiles and sound professionals. 

Be assured - you will not miss one single bit of the legendary Heerlen sound just because the tubes are labeled Mullard. The proud delta symbol in the date code tells you this is 100% "textbook" natural sound from Heerlen: warm and lively tone with infinitely expansive midrange and nice extension in both top and low frequencies. The technical advantages of the pinched waist design have taken sound to the next level: you get more forward vocals and a wonderful airy top end, super large imaging and incredibly clean sound.  

Professional Sound Evaluation

The pair worked wonderfully and sounded terrific in our professional studio setup for monitoring. 

 - Input: Cambridge Audio CXC V2 dedicated CD transport + Schiit Audio Bifrost 2 Multibit DAC
 - Amplification: Liquid Platinum Tube Amplifier by Alex Cavalli 
 - Output: Focal Clear MG Pro open-back headphones

Our full tube sound review was written 100% based on the actual listening experience while this pair of tubes were running in the system described above.

Professional Tube Testing

This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result: 

Tube 1:

Measured transconductance(GM): 12.89/12.82 mA/V  - 103%/103% (100% = 12.50 mA/V)
Measured plate current(IA): 17.654/17.361 mA  - 118%/116% (100% = 15 mA)

Tube 2:

Measured transconductance(GM): 10.54/11.15 mA/V  - 84%/89% (100% = 12.50 mA/V)
Measured plate current(IA): 15.606/16.184 mA  - 104%/108% (100% = 15 mA)

NO shorts, leakage or gas. NO noise or microphonics.

Curve trace is also included in the original RoeTest report.

Appearance & Cosmetic condition

Silkscreen: 95% - 100% (Pristine)Original Mullard tube boxes.

Date code(s): 
7L3 ⊿7K (7L3 = E88CC, ⊿ = Heerlen, NL, 7 = 1957, K = November)
7L3 ⊿7L (7L3 = E88CC, ⊿ = Heerlen, NL, 7 = 1957, L = December)

Packaging

NEW reproduction Mullard tube boxes.
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