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Old 30th October 2019, 09:18 AM   #1
aspringv is offline aspringv  Australia
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Hi there,
Just curious to know what the difference on the 18FX6 and 18FX6A is? One of the pairs I got is a 18FX6/18FX6A pair, hence the interest.

Cheers!
A

Last edited by aspringv; 30th October 2019 at 09:22 AM.
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Old 6th November 2019, 04:45 AM   #2
pmillett is offline pmillett  United States
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Location: Near Fort Collins, CO
Quote:
Originally Posted by aspringv View Post
Hi there,
Just curious to know what the difference on the 18FX6 and 18FX6A is? One of the pairs I got is a 18FX6/18FX6A pair, hence the interest.

Cheers!
A
The 'A' designation means that the heater has a specified / controlled warm-up time. That characteristic is useful when several tube heaters are connected in series.

In reality, there likely is no difference - I suspect all 18FX6 tubes were made to accommodate series heater strings, as that was the common application in AC/DC tube radios.

Pete
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Old 6th November 2019, 05:04 AM   #3
aspringv is offline aspringv  Australia
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tube rolling kit SSh2
Thanks kindly for the answer! I'd really better get my Engineers Amp finished too...

Looking forward to having a bit of a play with them, so thanks for making them available.
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