Skip to product information
1 of 5


1x Mullard EL84 6BQ5 - Philips Label - Blackburn 1961 rX1 - NOS

1x Mullard EL84 6BQ5 - Philips Label - Blackburn 1961 rX1 - NOS

Regular price $74.00 USD
Regular price Sale price $74.00 USD
Sale Sold out
Shipping calculated at checkout.

Sound Sample:

Product Summary

Model: 1961 Mullard EL84 6BQ5 (Made in United Kingdom)

Soundlumia Tube Sound Rating9.0/10 - Outstanding 
Lush and warm vintage tone, intiimate vocals, wide sound stage with layered details.

Date codes:
B1G1 (B = Blackburn, 1 = 1961, G = July, 1 = Week 1 of the production month)

GM (Mutual Conductance) test result: 135% of NOS/NEW

Silkscreen: 90% - 100%

Packaging: New white box

Professional Tube Testing

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

This tube tested NOS (100%+ mutual conductance value for NOS/NEW) on a reliable Mercury 2000 tube tester with the following result (mutual conductance both in uMhos and in percentage of NOS/NEW value): 

14,900 (135%)

Good tubes start at 7,000 and new tubes (incl. NOS/NIB) 11,000, and the Mercury 2000's rated mutual conductance for new EF86 tube is 11,000. Test result can also be seen in the pictures. In case you wonder what all these numbers mean to your sound experience, it's actually quite straightforward: mutual conductance directly translates to a tube's ability to amplify sound, so the higher the numbers the better. 
View full details