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I bought a bunch of NOS Toyo 6E5 (tuning eye) tubes that I use to replace bad 6G5 tubes. How much of a difference is there between the 6E5 tube and the 6G5/6U5?
6E5 eBay listing: http://tinyurl.com/ojyc5j6
Tom in La Porte, Indiana
Home of the First Automatic Telephone Exchange.
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The 6G5 employs a remote cutoff triode to drive the target and so takes a considerably larger voltage to close the eye compared to the 6E5 which uses a sharp cutoff triode. 6U5 was esp useful as a radio tuning indicator where the AVC voltage would be used to drive it. The remote cutoff characteristic gave the 6U5 much greater signal strength range compared to the 6E5.
So does that mean that if you substitute a 6E5 for a 6G5 that the eye will close with a weaker signal then what would close the eye on a 6G5?
Tom in La Porte, Indiana
Home of the First Automatic Telephone Exchange.
Bright area may overlap on a strong station. But it is the same except for sensitivity. It MAY be possible to add a resistor divider to lower input level, using resistors in the megohm range.
Depends on the specifics of the AVC. But it's probably pretty safe to assume that subbing a 6E5 for a 6U5 as a tuning ndicator will reduce the usefulness of it for tuning. A guess is that the eye will completely close on weak stations resulting In no useful indication on med and strong stations. Best way to find out is to try it in your specific app.
Yes, I have to agree I've replaced 3 6G5 tubes with no green display with 6E5 tubes and I get a bright green display but ther're useless for tuning.
Tom in La Porte, Indiana
Home of the First Automatic Telephone Exchange.
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