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Old 16th April 2012, 08:38 PM   #1
diyAudio Member
Join Date: Jul 2005
Default ECC33 Driver Stage

Hi Guys,

I have moved to Canada and am rebuilding my amp as the iron was just too heavy to haul in the cabin. Having added a few years poking about with SMPSs at work in the meantime, I am going to SMPS power this - which leads me to the questions below...

I have the following choices (to drive Brimar 6V6Gs)

Brimar 12SN7GT

Used this before, it works. Sounds great from what I remember in 2009.

Mullard ECC33

Not tried this before, but they sell for $250-300 on Tubeworld...what is going on?! I know the transconductance is higher, but otherwise it's 'close enough' to an a 12SN7. My primary reasoning for using this would be that I'd only need one heater downconverter... I must have a gander at the curves (The ECC33 is a 'switcher' type tube?)

Last edited by flyinglemur; 4th July 2015 at 05:42 PM.
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Old 16th April 2012, 08:55 PM   #2
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Join Date: Dec 2004
Location: Brussels
The ECC33 is a great sounding tube but way too expensive.
Did you considered the 12SX7GT ? Another 12.6V variant of the 6SN7 which will fit your application, and also an excellent sounding tube. Cheaper and better than most 6SN7/12SN7's.
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Old 16th April 2012, 09:04 PM   #3
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Join Date: Jul 2005
I actually managed to swipe a NOS Mullard ECC33 from college

It has been sitting in my guitar case for years!
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