NOS NIB Matched Pair Sylvania 7N7 Loctal Vacuum Tubes 1950s Test Strong Balanced
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One Pair-of-Ediswa n 6P25 EL33 KT61 Valve Tubes NOS. Sign in to check out Check out as guest. Adding to your cart. The item you've selected was not added to your cart. Add to cart - Best Offer: Make Offer - Loading. Resume making your offer, if the page does not update immediately. Add to watch list Unwatch. The EL33 needs a cathode resistor of 150 ohms at least, while the KT61 needs a cathode resistor of only 90 ohms. Without changing the cathode resistor the EL33 and the KT61 may never be used to replacing each other. As a makeshift one can use a KT61 to replace an EL33, but the performance will decrease.