RCA 5963 instead of 12AU7 or Alt

for the DIY ST35, the Dynakit and every other PP EL84

RCA 5963 instead of 12AU7 or Alt

Postby justinsweber » Tue Nov 03, 2009 7:38 pm

Hey Everyone.

I picked up a gently used DIY ST35 to compliment my ST70 and MKIII.

I got a stash of 5963 tubes... $5 each new (RCA) Im told they are directly interchangible with a 12AU7... is this true... will it work will in the 12AU7 spot? Any thoughts about using it on the DIY ST70 12AU7 spot?

By the way.. .the previous owner loved using 12BH7 tubes... again will this work in almost any 12AU7 spot?

Thank you very much,

Justin
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Postby EWBrown » Wed Nov 04, 2009 8:12 am

5963s are close enough to 12AU7s to be direcly interchangeable. 12BH7s (and 12BH7As) are also a good replacement, a popular DIY - ST35 "upgrade" is to use a 5751 and 12BH7A in place of the 12AX7 and 12AU7.

I've used 5963s as 12AU7 replacements in several projects, all with good results, and general improvement.

6GU7 is also very close to 12BH7, but with the 6.3V filament connected to pins 4 and 5 (same pinout as a 6DJ8).

HTH

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Postby justinsweber » Wed Nov 04, 2009 8:51 am

the lower voltage cap. was my concern... thanx for all the info.
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Postby Ty_Bower » Wed Nov 04, 2009 5:49 pm

Don't forget, you can also try the 5814 or 5814A in place of the 12AU7. I've had good luck with some of them.
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ST35 12AU7 Position

Postby HiFiGuy » Sat Feb 06, 2010 12:29 am

Can the ECC99 be used in the 12AU7 Position?
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