The Shun Mook Power Tube Resonators (PTR) use the same design principies as the mini-valve resonators by Shun Mook. Only the physical size of the PTR is much larger due to the higher level of energy flow through the bulb. The PTR is designed for placement on top of the vacuum tube; its body is approximately 1.4 inches in diameter bu 1-inch in height.Three silver alloy wire legs firmly hold the PTR to the top of the vacuum tube. The legs are sized at the Shun Mook Workshop for large, medium and small (1.75”, 1.5”, and 1.25” average glass diameter) vacuum tubes. However the user can bend and make adjustments to the legs to fit slight variations in different tube brands. In the case if tubes like the 300B or KT88, the legs are set for the top portion of the glass dome. Due to the high heat output of most tubes, the PTR is treated with a special heat resistant epoxy coating, In normal operation, the wood will get very hot which means the molecules inside are excited and resonating musical energy to enhance the bulb’s performance. At the same time after long periods of use the wood will show signs of cracking but this does NOT effect performance in any way The PTR is packaged in sets of two. For multi-tube power amps, it is not necessary to cover all output tubes with PTRs. Usually one or two per channel will be enough for a big improvement. It’s like upgrading your ordinary vacuum tube to those famous brand name NOS models. I've gone away from using amps with power tubes (yes call me stupid...I tell myself this all the time) but I have no use for these now. I have 2 sets of 2, price shown is for one (1) set of 2. Original box and paperwork included. 6-2017 One set SOLD one set left and one single PTR available. PayPal and shipping not included in price.
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