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Heavision
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xx SLO bias action
« Thread started on: Jan 19th, 2015, 5:10pm »

Hey guys. I know there are some threads on this already, but...

What brand of bias testers are people digging? (My baby needs new power tubes and I'm seriously considering doing the biasing myself--with the help and guidance of a seasoned tech, of course.)

Where do you like your bias set and why?

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nevismusic
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xx Re: SLO bias action
« Reply #1 on: Jan 21st, 2015, 12:33pm »

i bought a weber bias rite years ago and i still use it. https://taweber.powweb.com/biasrite/br_page.htm

what i do to set up my bias on all my amps is take the amp out of the chassis turn it up loud and play. then i try small changes then check where i am w/the bias rite. w/my SLO i'm at 27ma.

just a friendly fyi from my experience, i notice very little change in the tone/feel of the amp from biasing hotter or using different output tubes (which makes sense because the amp is designed to keep a clean power section at really high volume and get most of it's tone from the pre-amp). i had some TAD 6L6GC-STR around that i decided to try out and the stock 5881's were warmer in the highs and mids to me but still not much difference.
« Last Edit: Jan 21st, 2015, 12:38pm by nevismusic » User IP Logged

ryanmichael95
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xx Re: SLO bias action
« Reply #2 on: Jan 21st, 2015, 4:42pm »

Somewhere in the area of 65%-70% of plate dissipation.....around 42-44 ma on JJ 6L6 tubes. They are 30 watt tubes. My amp's around 450-460 plate volts. It makes the amp "come alive". I use a bias probe from Eurotubes. The digital one.
« Last Edit: Jan 21st, 2015, 4:44pm by ryanmichael95 » User IP Logged

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heritage80elite
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xx Re: SLO bias action
« Reply #3 on: Jan 24th, 2015, 09:35am »

I use a QuadStage BiasPro that I bought off of eBay. Guy who sells them is an electrical engineer and he makes each of these by hand. www.asharpfretworks.com. You'll need your own digital multimeter to use this bias probe, but it works great. I bias my SLO at 27 mA and use SED Winged C power tubes.
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1999Hotrod50
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xx Re: SLO bias action
« Reply #4 on: Jan 24th, 2015, 10:41pm »

I could be wrong, but isn't 27MA considered a 'cold bias'......just curious
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xx Re: SLO bias action
« Reply #5 on: Jan 25th, 2015, 10:46am »

on Jan 24th, 2015, 10:41pm, 1999Hotrod50 wrote:
I could be wrong, but isn't 27MA considered a 'cold bias'......just curious



Yes you are correct, that is a rather cold bias.
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Heavision
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xx Re: SLO bias action
« Reply #6 on: Feb 2nd, 2015, 4:10pm »

Thanks dudes. Great info.

By the way; I'm swapping tubes and biasing because I'm past due. But also; my fizzy, kazoo, jar of hornets tone problem is back with a vengeance! Weird, I know.

A few weeks ago I was playing and had a problem: volume/gain, bass super-drop-out, a little crackling and such too. Also--and this was weird to me--a sort of "noise gate" thing happened where my guitar vol was down at maybe half and if I picked lightly; nothing, if I picked hard; signal, albeit quiet and thin and crackly. I thought "pre-amp tube trouble! [Man, I'm an awesome amp tech guy!]." I tapped on them all with a pencil (cuz I totally know my shit!) and no noise/whistle/hiss, no problems, all good. Plus all my tubes are good quality, V1 V2 and PI are NOS, the rest JJ. Anyways, the problem just sorta went away--the weird "noise gate" drop-in-signal, not the jar of hornets, kazoo tone problem. Anyways, that's that. Any thoughts?
« Last Edit: Feb 2nd, 2015, 4:15pm by Heavision » User IP Logged

SLO ("bone stock")
Bogner 412, Scumbacks & Emis
a few guitars, (Highorder pickups!)
T.C. Hall Of Fame, Strymon Timeline
LOTS of picks
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