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Does the slll have to be baised??

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bubbleboy

Post subject: Does the slll have to be baised??

Posted: Wed May 16, 2007 10:06 pm

Friend

Joined: Sun May 13, 2007 11:08 pm
Posts: 21

Do you have to bias the EL84's on the slll?

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coco

Post subject:

Posted: Thu May 17, 2007 9:06 am

Holy Ghost

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7519
Location: Canada

Nope. Tthe 18, 15 and Deluxe are all cathode biased. No set up required. A common power resistor on the power tubes cathodes sets the bias.

In contrast, a JTM45 does requires biasing making that build more complex.

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Wicksy

Post subject:

Posted: Mon May 21, 2007 9:08 am

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Joined: Sun May 20, 2007 2:53 pm
Posts: 75
Location: Halstead, Essex, UK

As a side note i have found that you need to keep an eye on your power tubes. The Ampmaker 18 watt lite i built took JJs fine with the 150R cathode resistor but when i tried NOS Polam EL84s, there was a little red-plating under low light conditions. I upped the cathode resistor to 180R and had no further problems.

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zaphod

Post subject:

Posted: Mon May 21, 2007 9:12 am

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Joined: Sun May 20, 2007 1:45 pm
Posts: 1254
Location: YYZ

Or you could have made sure not to use your amp in low-light conditions. :lol:

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coco

Post subject:

Posted: Mon May 21, 2007 9:13 am

Holy Ghost

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7519
Location: Canada

Safe advice. We have used 125 ohm OK so far.

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rjgtr

Post subject:

Posted: Mon May 21, 2007 2:47 pm

Novice

Joined: Sat Apr 02, 2005 10:32 am
Posts: 122
Location: JAX, FL

Of course they still red plate in bright light conditions, but tubes always sound great when they are dying! :lol:

So a few minutes of bliss might be worth changing tubes every song! :roll:

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Richard Johnson
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Playing an insturment doesn't make you a musician, listening does

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