RCA 7094 tetrodes...

[nickds1]

Hi,

I have found a pair of RCA 7094 NIB tetrodes in my loft (I bought them years ago as part of a large lot - didn't know they were in there).

I'm a novice in the tube amp stakes - currently just building my first (a nice version of the Bevois Valley amp from Morgan Jones - Sowter transformers arrived yesterday! may be ready for xmas... or maybe not)...

Anyway, do the 7094s have any audio use? Has anyone done anything good with them? As I only have 2, I was wondering if they would make a good SE tube (though I was going to do a 6C33 SE amp next).

Should I just put them on eBay for the radio amateur lot?

Thanks

Nick

[tubelab.com]

I have never heard of these before, but after looking up the data, they have a set of curves for "Hi Mu triode connection". Here you connect G1 to G2 and use it for the control grid. In this mode it looks like a really pumped up 811A, which makes a good audio amplifier in A2 operation. These tubes would likely do well in a A2 SE amp, but that requires a really good driver circuit. They will also need a lot of plate voltage, maybe 600 to 1000 volts. Since there are no obvious circuits for this, you are forging into uncharted teritory. If you are new to this hobby, I would try a different tube first, at least the 6C33 doesn't need a lot of voltage.

If you decide to put them on Ebay, let us know here. I am crazy enough to try this (as if I don't have enough projects already), but I don't watch Ebay very often.

[Ken Glaza]

Have the same thing. Just finding out what they can do. Any specs on them? Let me know if something develops. Likewise I will do the same.