SKU:98922596351
Matched Pair Sylvania Type / Number 27 #27 Vacuum Tubes Valves Perforated Plates
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Ships within 48 hours · Estimated delivery Sep 26 - Oct 1
Description
Matched Pair Sylvania Type / Number 27 #27 Vacuum Tubes Valves Perforated PlatesThis matched pair of Sylvania Type 27 triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 32 for Tube One and 33 for Tube Two where minimum (65%) is 25. The tubes have rounded black plates; wire snubbers for increased rigidity and lowered microphonics; dimpled sheet getters; excellent flashing and well secured bases and bottles that are nice and tight. WE
These five GE number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U
They have engraved bases
minimum (65%) is 1690)
mesh plate tubes tested 33 and 34 on our Paul Hart-calibrated TV7/U where minimum (65%) is 25 and 100% is 38
As a survivor of Communist East Germany
One is a Cunningham
Minimum (65%) is 32/32 and 100% 66/66
Transconductance: 1410 / 1411 (New is approximately 1450)
There were no shorts or gas and they measured as follows (from left to right
each with three rectangular holes
This Ken-Rad 5V4G rectifier tube was tested on our Paul Hart-calibrated TV7/U
Please note there has been some flaking of the cathode material
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