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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Defective 300B Tubes? posted by Devils Advocate on August 15, 2015 at 16:49:53:
I have a good friend who runs a Cary SEI300b in his system and I have repaired it for him on several occasions. The heater supply to the 300Bs is a joke. It consists of a silicone bridge and a cap. Failed twice in my buddies amp. Even worse, the voltage was well over 5V. 300Bs don't take too well with over voltage on their filaments. I would measure the filament voltage being supplied to the 300Bs. If significantly over 5V I would suggest adding a resistor between the bridge and cap. Look up the current draw of the 300Bs to estimate the value of the resistor for the needed drop and determine final value empirically.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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Follow Ups
- RE: Defective 300B Tubes? - JKT 08/16/1515:53:15 08/16/15 (1)
- RE: Defective 300B Tubes? - Caucasian Blackplate 10:11:32 08/17/15 (0)
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