Adopting a conventional active RIAA equalization phono stage circuit. T is 3 metal covers and 4 acrylic covers for those tubes.
And you will be able to choose which type as you like. Supporting 6N2/12AX7 tubes, which offers many replaceable tubes for you like 6H2,6H2n (For 6N2 type) and 12AX7B, 6N4(9PIN), ECC83,5751 (For 12AX7 type). On the bottom of the description, t is a few Q&A for buyers who might meet the humming problem.
If you encounter a similar issue, please check those tips, which have covered most of conditions. As our valued customer, we will do our best to make sure the product you receive arrives to you on time and as expected. This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps". The seller is "the_global_village" and is located in this country: US. This item can be shipped worldwide.