Letters • April 2023

Replacing output tubes

April 19, 2023

Marc,

If my amp does auto biasing, does it matter if I replace just one maybe two output tubes that have mileage on them with new ones? Or is mixing old with new not recommended?

Sheldon Simon

It depends how the amp automatically biases the tubes: by pair or all tubes as a group. Either way, I would contact the manufacturer and follow their recomendation. It's always advantageous to replace all output tubes at once. Then you can buy identical tubes, not mix and match, and you won't need to track the life of each tube individually. --Marc Mickelson

". . . please add me"

April 1, 2023

Marc,

Regarding the e-mail list, please add me. Thanks.

Tony Margherita

You've been added. To join TAB's reader e-mail list and find out about new articles first, send e-mail to rl@theaudiobeat.com. -Marc Mickelson

 

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