Tube amps and speaker ohms

05-26-07: Bartokfan
My JOR is,, well the one I sold...is rated 40 watts "conservatively" as they say...does "manage" to drive the 89 db speakers. However since i never biaed the unit, I am not sure there was more highs it could have achieved.

You NEVER biased the tubes in your JOR? Thanks for admitting this. It completely invalidates every post you have ever made about your comparisons of different tubes, including your preference for the KT90.

When you receive your new tube amp, unless it's an autobias model, you MUST bias your tubes for the amplifier to sound as it's supposed to sound.

Inexperienced members of Audiogon who are looking for guidance read posts and take them as gospel, not realizing the egregious errors sometimes made during the testing and listening process.

Readers of your posts deserve better.

The guy who bought my JOR , who actually owned 2 previous JOR's said the amp "should/ought" to be biased every year. Take that up with him. I figured he knows what he is talking about. said tubes wear every yr and a slight bias adjustment 'could be made". Obviously take all my posts as though i am a learning newbee. I hope no one takes anything i say with too much seriousness. Just ideas to open discussion. We can all learn something here. You too.

05-26-07: Bartokfan
The guy who bought my JOR , who actually owned 2 previous JOR's said the amp "should/ought" to be biased every year. Take that up with him. I figured he knows what he is talking about.

It's too bad you received bad advice. Tubes should be checked every few weeks or so for bias, and every time you install different tubes, they have to be biased.

Good lesson learned.

We can all learn something here. You too.
Bartokfan (Threads | Answers)

Yup. I learn something here every day.

Tvad, all the time I had the JOR i never thought to bias the unit to see if I could get a tad more highs. Now that i have the Defy 7, if there is something I don;'t like about the sound, i'll look into biasing the unit. But since the amp has few hours on it, should I bias the amp? It should be biased correctly with few hours use. I've never heard tube amps need biasing regularly. I should look into how to bias the defy 7. Not even sure how to go about it. There is a wooden board at the bottom. Will have mt tech friend assist me first time.
Also I learned the JOR had a pre out and never took advantage of in use with a sub. I will have Tyler replace the woofer in his Taylo with a Seas Excel W26. And so will keep my Thor's, which I had for sale 3 days last week.
The things we learn, one must research and think for oneself of all the options avaliable.

If the Defy is not autobiasing, then it requires biasing the first time you install it and power it up. Then, the bias should be checked at least monthly thereafter. Why? Because tubes age, and the bias shifts. Autobiasing amps take care of this for you.

Your amp's manual will explain the biasing procedure.