Selling two of these. Proven performance, used in many different brand tube amplifiers around the world. This board would permit to warm up vacuum tube filament first, and then switch to high plate voltage in about 20 - 30 seconds later. To protect your expensive output vacuum tubes such as 300B/2A3/845, KT88/El34 ... to achieve longer lifespan, you need to get this delay action board (assembled, ready for use). Green wires with LED are for pilot display.Braid green wires are for 6.3V AC (from tube filament supply).Red/Black wires (2 pairs) are being used to switch up to two (2) sets of power supply.Instruction: When turn on main power switch, let the tube filament on first, 30 seconds later this delay action board is going to switch on (control two sets of plate voltage supplies).The board gets 6.3 AC voltage for its own power use. Once 6.3V AC (from filament winding) is being applied to the board, the red/black pairs are going to be connected in about 30 seconds. So you may use one pair of black/red as one set of switch. There are two sets of switch in this board for turn on the plate voltages with a delay.Warning: This board is intended for experienced users due to the high voltage involved.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

Lot of 3 tubes. One generic. One from EML Emission Labs, one from Sophia Electric.274 274BI have no way of testing these, but they look very new. On 03-May-24 at 09:36:15 EDT, seller added the following information: I spoke to the customer that brought these in and he confirmed that they are working. And operation was just confirmed with a tube tester.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.