Systemic Development > Amplification and Preamplification
New: KT-170
Nick B:
--- Quote from: steve on August 23, 2021, 10:37:42 PM ---
--- Quote from: Nick B on August 19, 2021, 01:56:39 PM ---Steve,
How would these values compare to something like a KT 88? Any idea if the build of this tube is likely a result of a special order by an equipment manufacturer or if TungSol built it with the assumption that equipment manufacturers will start utilizing it in their designs?
Nick
--- End quote ---
Sorry I am late responding Nick.
Tube shape is different than 150, may or may not mean anything. Like the 150 and 120, the high plate voltage can be a cause for concern in beam/pentode mode as voltage spikes could be high enough for arcing between pins 3/plate and 2/filament. In UL or triode mode, 600 volts, I would not be too concerned.
The Chinese tried manufacturing the EL-156, but evidently a bust as I don't see it sold in the USA anymore. It also had a high voltage rating but the screen was designed for a lower voltage, so triode/UL operation was limited to a lower screen voltage, dissipation, thus efficiency.
The KT-88/120/150 has a higher screen voltage rating for more efficient use in UL/triode mode. In beam/pentode mode the high screen voltage makes the tube less efficient.
The 170 has a great cathode emission rating of 300ma, the 120 is 250ma and I believe the 88 is around 230ma.
I don't know concerning your last question of manufacturers. Years ago I tested the new tung sol
6550 and was not impressed sonically. Maybe the 120/150/170s are different though.
cheers
steve
--- End quote ---
Thanks, Steve. I appreciate your thoughts :thumb:
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