bohemian

another valve question!

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How do you valve guys rate jj12au7s?  I have 4 which I am rolling in the central positions on my PL Dialogue Premium Monos in place of stock PL valves. (preamp has mullards in central positions)

The midrange seems very good but I wonder if I could do better? Can't run to mullards at £70 each, but maybe look at gold lion or brimar?
 

Love my valve amps but I am confused about relative quality of valves and don't want to spend a fortune tube-rolling (6 12au7s in pre and each mono!)

I must say I am loving the PL EL34s and I have some 6550s when I fancy trying them.

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I've a PrimaLuna Prologue 5 power amp. 

It came with Philips JAN 12AU7 and 12AX7 input valves which were OK but things improved noticeably when I replaced them with TAD valves.  I've not tried JJs in the PL but I generally prefer TADs to them. I also now have a set of Psvane and they are good, too, pretty much equivalent to the TADs, I can't say I prefer one over the other. 

The amp came with Edicron 6550 power valves, I swapped them for TAD el34 and was impressed by the extra clarity. I'm not usually a fan of el34, but the TADs worked really well. I then tried KT120, heh, the search stops here! Superb.  They are tall, though, and just fit in the valve cage if it's on tippy toes! 

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Recently acquired a pair of PrimaLuna Prologue Six monoblocks that had Electro Harmonix 12AU7's replaced them with RCA clear tops for a good improvement in sound quality

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Its a while since I used that particular tube.  However, I quite liked the old Ei Elite Gold Pins or Electro Harmonix Gold pin varieties.

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Posted (edited)

with the jj tubes I am getting clearer highs and upper mids, which may help me because of age-related hearing loss. The bass is still great.  I think I will leave them in for a while and then maybe revert to my previous configuration.

I'll get the piggy bank out to save for something like the mullards or brimars.

Edited by bohemian

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Posted (edited)

The TADs would give you the sophistication and subtlety of the Mullards imo but will retain the upper freq clarity of the JJ.  The Mullards /Brimar are a bit "cumfy" and smooth in comparison.

Edited by JANDL100

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