The matching on these is for plate current and transconductance and each tube box is marked with these numbers as well as a serial number. These tubes are exactly matched. The sound of these El34s is romantic and warm, reminiscent of the NOS Mullard, in fact we think they are better.
As Engineers and Audiophiles we have been dealing with Tubes and vintage equipment for 40 years. Try a Quad in your ST-70, Marantz 8B, MArantz 9, QuickSilver MX-190 (Octet), or a Pair or Quad in your Marshall or any Guitar amplifier that uses El34 tubes. Our company CTech Electronics stands behind its products and services. We are a full service company offering parts, tubes and repair services for vintage equipment.
This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets". The seller is "ctech-electronics-store" and is located in this country: US. This item can be shipped worldwide.