2. amps-preamps
  3. 1225326688

Mesa Baron

Not a question, really, just looking to share something with any users of the Mesa Baron all-tube power amp (now sadly discontinued).

I just found THE preamp to match this high-gain amp, after trying for 10 years. It's the Promitheus Audio TVC (passive transformer volume control).

Over the past 12 years, I've used the Baron in 3 phases - back in 96-97, when it first came out, when I reviewed it for a publication; then in 2000-2001 when I bought and then sold one ... and finally, in 2004, which I intend to keep until Hell freezes over.

I've used McCormack's passive TLC-1 preamp (a pretty great match), Audio Research low-gain LS15 and LS16, Quicksilver Linestage and many others ... but something just clicked with the TVC.

Just in case anyone's still in the hunt to optimise their Baron's performance. Do note - all the while, I've been using the stock version. I have, however, messed around with the input driver tubes (AX7) - the onboard Russion Sovteks have the best punch, Tungsols sound cleaner and airier, and Mullards are just too syrupy for me ... :)

Appreciate any thoughts ...

cheers
bassraptor
lloydc's avatar
lloydc
751 posts
 
I forgot to add that I have had the best results with old Telefunken input tubes, but the difference was very subtle and I am not sure it is worth the trouble and expense.
bassraptor OP
64 posts
 
If you're looking at something cost effective: http://www.promitheusaudio.com/

Otherwise, a passive tvc shud work great. I've written to the Mesa people to check on the tubes and upgrades, let's see ...

Yes, I bought the amp from the authorised dealer!
heradot
30 posts
 
Hi, I also bought a Baron this week just to test. Amp is in great condition but still has first original 5881 tube set. Think is not in excellent condition anymore afer all these years and I think to replace also to avoid damage of the amp or my speakers.

Has anyone listened to TUNG-SOL 6L6 G (bottle) in this amp. Is this tube working/matching with the Baron? Could someone tell me something about the mods you've written? It's possible to use the EL34 tube set without any modification or is amp originally sold with EL34 the same like the 5881 version?

Many questions. Thanks for your help; amp is very rare here in Europe so it's hard to find someone to help me.

Bye,
Marco
kana813
956 posts
 
The guy I got my Baron from had replaced the 5881s with Russian 6N3CEs. These tubes failed, blew out some resistors and ate one of my tweeters.

I fixed the amp and installed a matched set of 6L6s, but was always worried it would eat some more drivers. Hopefully, the next owner got more enjoyment out of it.

BTW- there's no need to use XLR cables, the input section is not balanced.
lloydc's avatar
lloydc
751 posts
 
Marco, originally the amp was built only for 5881/6L6 tubes, although the manual implies others could be used, but recommended against it. Later, audiophiles convinced Mesa and the designer, Randall Smith, that EL34's would sound better, and a factory modification was offered called the "tri-tube" mod. Mesa then offered tri-tube Barons with E34l tubes, later finding that they were not reliable and robust enough, and finally settling on EL34's. The do sound much better in most ways, in almost everyone's opinion, but are still not as reliable as 6L6, which have a lower bias point and run more conservatively (I think). Almost any good 6L6 probably sounds better than the 5881; Mesa offers some they say sound better than the 5881's.
More to discover