strange tube? E-8128

Electar · 11th January 2009, 06:13 PM

I have a few guitar amps from the 30's and 4o's .the one from the 40's has a Black metal tube that reads

E-8128 clarostat

I cant find any info on it or any codes for testing.

M

Tom Bavis · 11th January 2009, 06:32 PM

Clarostat made resistors - could that be a clue?

This is probably a ballast resistor for a series heater string. Such amplifiers are potentially very hazardous unless an isolation transformer is used.

Electar · 13th January 2009, 01:21 PM

I added an isolation transformer in line, I would like to test that resistor but i cant find any info on it,or another one.Its been getting hotter and hotter lately.

Thanks

11th January 2009, 06:13 PM	#1
Electar diyAudio Member Join Date: Jan 2009	strange tube? E-8128 I have a few guitar amps from the 30's and 4o's .the one from the 40's has a Black metal tube that reads E-8128 clarostat I cant find any info on it or any codes for testing. M

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11th January 2009, 06:32 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Clarostat made resistors - could that be a clue? This is probably a ballast resistor for a series heater string. Such amplifiers are potentially very hazardous unless an isolation transformer is used.

13th January 2009, 01:21 PM	#3
Electar diyAudio Member Join Date: Jan 2009	I added an isolation transformer in line, I would like to test that resistor but i cant find any info on it,or another one.Its been getting hotter and hotter lately. Thanks

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