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Re-tubing my Audio Research Ref 3

Hi, after getting great advice on this site re re-tubing my ARC ref 110 power amp, I was persuaded to do it myself so have detailed advice on biasing etc. Anyway I decided to buy the valves/tubes for my ref 3 too. Apparently as most made in Russia, supplies are running out so thought I might as well get them - also the ref 3 has 3,850 hours on them.

Anything i need to know about putting these in. Do they need biasing etc? Or just put them in?

willmarchant
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willmarchant OP
11 posts
 

Thanks Mulveling!

mulveling's avatar
mulveling
1,895 posts
 

Preamp tubes don’t need biasing adjustments. The four 6H30 for the audio circuit should ideally be a matched quad, in which case put them in any which way. If you have 2 matched pairs, ask ARC for guidance on the best layout to deploy them in. If you don’t have any matched tubes here (matching within ~ 10% on mu and Gm) - you should have bought a matched quad :)

The power regulator tubes are both singles, so just put them in.

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