post #1 of 1
Thread Starter 
This Classified is Closed

For Sale:
Mullard 6SN7GT tubes, grey glass, AVO tested

Will Ship To: EU

I bought these a couple of weeks ago as NOS from Langrex UK.  In my headphone amp (Icon HP8) there was a slight noise in one of the channels (noticeable only in quieter passages of music), so I've had them both fully tested by Mullard Magic (AVO VCM163).  Test data are below and I will include the report in the sale.
 
Although they're not quite suitable for my application, someone else may find a use for them.
 
6SN7GT tubes marked Mullard, British Made BVA, actual manufacturer unknown. 
 
Tube 1
 
Anode current Ia (mA) A1 = 9.3, A2 = 9.5 (Spec = 9), emission A1 = 103%, emission A2 = 106%. 
Mut conductance Gm (mA/V) A1 = 2.2, A2 = 2.3 (Spec = 2.9), emission A1 = 80%, emission A2 = 80%.
Sections matching < +/- 10% = Yes (Pass)
Emission >80% all sections = Yes (Pass)
 
Tube 2
 
Anode current Ia (mA) A1 = 7.5, A2 = 7.5 (Spec as above), emission A1 = 83%, emission A2 = 83%. 
Mut conductance Gm (mA/V) A1 = 1.8, A2 = 1.8 (Spec as above), emission A1 = 62%, emission A2 = 62%.
Sections matching < +/- 10% = Yes (Pass)
Emission >80% all sections = No (Fail)

 

Price includes the PP fee.  Postage to the UK is £5.  Please contact me for a quote for the rest of the EU.