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Flying Leads Plug&Play CV4033 - Premium 12AT7 ECC81 E81CC ECC801S 6201 6060 CV455 CV4024 type.

Worthy upgrade (Brimar CV4033) May 24, 2010
Reviewer: George Fink from Beaumaris, Victoria Australia  
I purchased these to replace the EH 12AT7 tubes in my Manley Mahis amps. After contacting tubemonger re suitable tubes they suggested a Siemens and 2 Brimars one of which was this type.

The sound of my amps changed quite dramatically. The harshness and coldness in the mid was replaced by a much smoother and detailed sound, warmer and more involving. Treble is smoother and not as upfront.  Bass is deep and more detailed somehow. Overall a great improvement.

The tubes sit on a black Plastic base and plug in as normal, this base is attached very well and no wobble has been noted.

I tried a Brimar 6060 yellow T in this amp and preferred the cv 4033. More life in the music, the 6060T sounded flat in comparison.  

Overall a great upgrade to new tubes, not much cost and 10000 hr life. You can't lose.

Brimar CV4033 May 10, 2010
Reviewer: Anonymous from San Diego, CA  
The CV4033 tubes that I did buy will satisfy the 12AT7 tube rolling urge for a long time to come.  These are in a totally different league from the RFT and Electro Harmonix tubes tried previously in Bottlehead Paramount amps. These tubes have warmth and detail similar to what I experienced with Brimar 13D5 tubes used in a Bottlehead Foreplay preamp.
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Brand New MINT NOS NIB Rare 1970-71 BRIMAR CV4033 Black Plate Military tubes. CV4033 Flying Lead is Premium Grade, High Reliability Long Life version of CV4024/6060/ECC81/12T7 valves. STC Rochester Plant Date Codes. Made in England. Brand New MINT NOS Rare 1960-62 BRIMAR CV4033 Black Plate with Copper Grid Post Military tubes. Factory tested/serialized*. CV4033 Flying Lead is a Prem Grade, High Reliability Long Life version of CV4024/ECC81/12AT7. STC Rochester Plant England. IMPERF Brand New MINT NOS NIB Rare 1970-71 BRIMAR CV4033 Black Plate Military tubes. CV4033 Flying Lead is Premium Grade, High Reliability Long Life version of CV4024/6060/ECC81/12T7 valves. STC Rochester Plant Date Codes. Made in England. IMPERFECT TEST SCORES.
2040M 2042MI 2040M-IMP