GE JG-5751 Low Microphonic 12AX7 (PAIR)

Triple Mica - Heavy Duty Posts - Gray Plates

Tube #1 Labeled: GE JG-5751 Vintage 1961 Week 33
Tube #2 Labeled: GE JG-5751 Vintage 1961 Week 43

These are considered one of the finest 5751 tubes ever made. They have the desired Triple Mica and Heavy Duty Posts. They have rich and smooth tone with an extremely quiet background. The 5751 was originally developed for military use and are very consistent testing. The 5751 is totally compatible with a 12AX7 with a bit less gain. They are extremely low noise and not subject to microphonics. These tubes were made tough and can withstand a drop on the floor. It's extremely hard to find these today, especially a matched pair! 
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TESTS NOS - Platinum Triple Matched on AT1000

          Amplitrex AT1000 Test Results                       90%+ GM = Within NOS Specs              90%+ EM = Within NOS Specs

 

(GM) Mutual Conductance

1200 = SPEC

(EM) Emission

3.0 gV = SPEC 

Noise

Test

Gain (mU)

TUBE #1

 1200/1200   (100.0/100.%)

  2.9/2.9   (96.7/96.7%)

 5/5

63.1 63.1

TUBE #2

       1200/1230          (100.0/102.5%)

          2.9/2.9          (96.7/96.7%)

 5/5

63.1 68.8

TUBE #3

N/A

N/A

  

N/A

TUBE #4

N/A

N/A

  

N/A
  • PERFECT = 0.0% (10% or less = Outstanding)
  • Balance (Balance Goal = Mhos > 10% / Gv > 10%)
    • Tube 1: A to B = Mhos - 0.0%  Gv - 0.0%
    • Tube 2: A to B = Mhos - 2.5%  Gv - 0.0%

  • Match (Tube 1 to Tube 2) (Match Goal =  Mhos > 10% / Gv > 10%)
    • Tube 1A to 2A = Mhos - 0.0%  Gv - 0.0%
    • Tube 1B to 2B = Mhos - 2.5%  Gv - 0.0%
Noise Test Scale: 5=Ultra Low; 4=Very Very Low; 3=Very Low
Tube Gain Specs:  70 Mu (+10 or -10) = Within Factory Specs
About BULLzTUBEz:
I've been an Audiophile for over 50 years, 2 time National Champion in Car Audio and owned a chain of Car Stereo Stores... I have a massive collection of vacuum tubes specializing in mostly esoteric tubes but we have just about any tube you need. Just check the store for the listed inventory. If you have a request just send a message to NOVA.76 through the eBay messaging system...

About my TUBEz:
All tubes are tested with the Audiophile in mind for SHORTS, GAS, MUTUAL CONDUCTANCE and NOISE (large tube lots are not tested for noise). All my tubes are tested thoroughly on an Amplitrex AT1000... My backup tube testers are an AVO MKiv and another Amplitrex AT1000... I WILL NOT GUARANTEE THAT MY READINGS WILL MATCH YOUR READINGS...

I stand behind everything I sell... My goal is to "Create a Positive Experience" for my customers...

Warranties:

Used or vintage items are sold as is with no warranty beyond the description and photographs provided on the listing. Returns will NOT be accepted for reasons such as: don't like the sound, ordered the wrong item, changed mind, not what I thought it was, wrong color ordered, wrong item ordered or tube readings don't match my tester. Any exceptions are on a case by case basis and subject to a 15% restocking fee... 


Shipping:
Domestic Shipping to the continental United States will be by the US Postal Service (USPS) including free tracking. Some items listed will ship free and will be clearly listed as "free Shipping". Items not listed as free shipping will be for the cost of packaging plus shipping only, no extra charge will be added to the USPS fee.

INTERNATIONAL BUYERS PLEASE CHECK THE SHIPPING CHARGES PRIOR TO BIDDING
International Shipping will be offered for select items and will be clearly identified in the listings Shipping & Payment tab. Shipping will be by the "eBay International Standard Shipping" and be made available as a shipping option at check-out. Shipping costs to international locations will be paid by the buyer. The shipping and handling cost will be clearly identified at check-out. THERE ARE NO RETURNS ON INTERNATIONAL SHIPPING, apart from the exceptions as dictated by eBay... Please note the following:
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  • Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying.
  • These charges are normally collected by the delivering freight (shipping) company or when you pick the item up. Do not confuse them for additional shipping charges.
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