My guess is he did not mean to recommend the 6N1P as that is an INPUT tube.

Personally I am not a fan of output tubes other than the 6P15P (aka SV83) tube as this one takes advantage of the CCE mod, and I always hear the lack of that mod and prefer to hear it. Just my 2 cents.

I am not sure if a WE 274B is compatible with the amp--and is probably going to be very expensive.

As input tubes I have boiled down my favorites to NOS Amperex 7308 or Cryotone ECC88-WC.

Thanks for the info, gents! Although it sounds like the tubes that he has recommended really aren't rated by either of you haha.

I do see there is someone locally here that is selling a Mullard GZ33 for ~€50 which isn't too bad and could be worth a punt.CAJames, any insight on how it might vary the amp's sound compared to the stock rectifier?

That's encouraging to hear! In which case I will snatch one up and check it out. I guess it also begs the question then of whether there are any input/output tubes you'd recommend pairing with the GZ33?

Thanks, Tony. But I already put in and order from someone selling locally earlier today. Glad to hear that the GZ33 is working well in your system though. I'm actually waiting on my first pair of Omega speakers (Junior 8 XRS's) that Louis is building for me and would be keen to hear your thoughts on how your Omegas (I peeped your signature) pair with your ufo25 (and the GZ33) if you're ok to share

I’d take CAJames advice and become adventurous.  Through his advice…I went with the EL822 with the adapters, and I really liked the sound.  

Dom

Just wanted to check back in to say that the GZ33 I bought arrived and I am stunned by the improvement to the sound compared to the stock rectifier. I honestly wasn't expecting such a significant difference but everything just sounds fantastic. More dynamics - tighter, weightier bass and far more depth to the soundstage. Appreciate the recommendation, folks!

Now I'm curious to try the El822s... Any suggestions on where to buy (with adaptors) that might ship to Norway?

Cheers! Will look into it

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You're very welcome, glad you're enjoying them.

Dominick (Dom) recently posted a picture (that I can't find) of a similar issue with an adaptor that didn't fit between the screws. I would say it is not a critical problem, but it is not ideal. If you are handy you could try making a (very) small notch in the edge of the adapter so it fits over the screw. Or, you could get an inexpensive 9 pin socket saver that will likely fit better between the screws.

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School is out and you have graduated, you are on your own now . Input tubes can be highly variable and highly personal so my advice is don't be afraid to try them, but don't expect great results from every tube. But do let us know what you find! Also, if you haven't already, I would start looking through other threads about tube rolling to see what other posters do and don't like.

You mentioned the placebo effect, and one thing to keep in mind when you're changing tubes is volume does have an effect on perceived audio quality, with louder being "better." So if a tube don't sound great consider whether the volume is the same as your usual listening level. Another thing to consider when you're changing input tubes is the bias switch in the front of the amp. It will change the performance of an input tube for better or worse, but will also change the volume. So be sure to adjust it to make a fair comparison.