Tubes, old and new


I sat down next to Tim Pavaracini in a room at T.H.E. Show in Irvine weekend before last, and listened to him talk about tubes. He told me that in the 50's and 60's the various tube companies would swap tubes amongst themselves when they ran low of a certain model, putting their own logo on the glass of a competitors tube. It would therefore behoove tube enthusiasts to learn the internal physical characteristics specific to each make, especially when spending big money on them. Tim's personal favorites are Mullards. He had nothing good to say about ANY tubes being manufactured today, feeling the guys and gals on the tube assembly lines have not apprenticed long enough to learn the skills necessary to build a quality tube, that they are not career professionals, but merely temporary employees. Buy your tubes from an honest, knowledgeable tube vendor!
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Wolf, how about those Tung Sol 5881 tubes for one of those geetar amps of yours, a favorite of mine in my preamp as a regulator, man are they musical!
If you go to Brent Jessee's site he usually has a bit of history behind the tubes and their provenance: who originally built them, for who, and if machinery was left that the newer ones use. It can be quite informative.

Also, I read somewhere (or was told by Jesse himself) that some of the metals used back in the day are no longer available due to their potential and illicit uses in weapons manufactoring. Newer tubes can be made to very exacting standards but they'll never quite sound the same as NOS. That's not to say they'll sound inferior, just different.

All the best,
Nonoise
I no longer use a 6L6 type guitar amp so 5881s wouldn't work…6V6 and EL84s for lower wattage amps these days.