[Boatanchors] Re: Tube substitution question

Tue, 07 May 2002 22:33:06 -0400

Ken -

My RC-30 lists the 5963 as "similar" as a sub for a 12AU7.  Description for 12AU7 is "phase
inverter or push-pull amplifier in AC/DC radio equipment" while 5963 is "used for 'on-off'
control applications involving long periods of operation under cutoff conditions."  Max
plate voltage for the 12AU7 is 330 volts; for the 5963 it's 250.  Example application listed
for the 5963 is "Frequency Divider in Computer Service."   Pinout is the same.

The substitution chart lists the direct industrial replacement for a 12AU7 as a 6189.

Kevin

[email protected] wrote:

>   I just got back from AES where I picked up a 5963 tube as a substitute for a 12AU7.
> At least I thought it was a substitute. My Eico 667 tube tester lists different settings
> for both types. Tested as a 5963, it comes out fair. Tested as a 12AU7, it comes out
> much better. It's going in an HQ-180A as the product detector. Anyone know just
> what the difference is between these two types? My memory (yeah right), tells me
> that the numbered tubes were heavy duty industrial equivalents of the number-letter
> tubes. True?
>
> Thanks,
> Ken kb7rgg
>
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