View Full Version : 6eu7 equivalent?

09-19-2009, 01:25 AM
Does anyone know of an equivalent for the 6eu7? Iv looked but came up empty handed.

09-19-2009, 01:34 AM
Similar to 12AX7 but with different filament wiring, no?

09-19-2009, 01:36 AM
Yep! 12AX7, but its not a drop in replacement. You would need to rewire the tube socket.

I accidently broke my one and only 6EU7 in my Magnavox preamp/tuner, so I rewired it for the 12AX7. Works exactly the same as it did with the old 6EU7.

09-19-2009, 05:22 AM
The 6EU7 is a purpose made tube to have no cross ,originaly made by RCA so you woud have to buy it from them ,rewire the socket for 6DJ8 or 12AX7

09-19-2009, 08:11 AM
Like everyone else said.....NO direct drop in replacement. are going to use current production 12ax7 tubes, I'd rewire the socket.
BUT.....if you like NOS tubes, stick with the 6eu7 tubes.
NOS 6eu7 tubes, which BTW, are made by other manufacturers other than RCA also, are roughly half the price of most of the better NOS 12ax7 tubes.
I found a pair of NOS Mullard 6eu7 tubes of flea-bay, for under $50.


09-19-2009, 10:31 AM
Right, comparing them, entire socket rewire. 6eu7s not cheap. Avail, yes.
I asked only for replacement/spares purposes. 8802 uses 2. But I do have a couple
12ax7 in case of emergncy. I'll just keep looking for some to come up on ebay for a good price(ha ha). This amp is not that good anyway. Needs new beefier OPTs. Not heard it yet after new coupling caps, feedback bypasses, PS and hf decoupling.
Did some scopeing for freq resp/amplification. Flatter and more bass extension to 40Hz but amplification sure looks low. .3vin for 1.7max at clipping(.1in/.6out lowlvl 40-20k). It's been an education. Rite up my street.

Jim McShane
09-19-2009, 11:04 AM
The 6EU7 is a purpose made tube to have no cross ,originaly made by RCA so you woud have to buy it from them ,

Agreed, they did the same thing with 5879 and a few other tubes.

rewire the socket for 6DJ8 or 12AX7

No, not 6DJ8. The 6EU7 is a 12AX7 with a scrambled pinout and 6.3 volt heater only. Use a 12AX7 wired for 6.3 volt filaments.

6DJ8 mu is only about 1/3 of a 12AX7 or 6EU7.

09-19-2009, 11:09 AM
There are quite a few circuits that would probably respond well to having less gain, but without knowing which one is being discussed, it's hard to say.