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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Sun Jan 15, 2012 11:02 am
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Have fun. I sure did. :wink:

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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Fri Jan 20, 2012 7:44 am
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Got my tubes in yesterday! Put 'em in. It does bring the gain down, but for right now, I LOVE IT! Will find out how it compares next weekend, when I get together, with my just starting out band, next weekend. More to come!

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Blues Deluxe Reissue
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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Mon Apr 23, 2012 4:05 pm
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So you have the 12AY7 in V1?

Do you notice a clear difference with the stock tubes regarding the clean tone? Also, how do the 5751 work in comparison with a 12AY7 in the same position? (maybe a question for bluesky636 since he tested a lot).

I am looking for a cleaner tone out of my BDRI too. It's great how it is, but nothing wrong with experimenting right?


Last edited by jaymie66 on Tue Apr 24, 2012 12:36 am, edited 1 time in total.

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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Mon Apr 23, 2012 4:13 pm
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jaymie66 wrote:
So you have the 12AY7 in V1?

Do you notice a clear difference with the stock tubes regarding the clean tone? Also, how do the 5751 work in comparison with a 12AY7 in the same position? (maybe a question for bluesky636 since he tested lot).

I am looking for a cleaner tone out of my BDRI too. It's great how it is, but nothing wrong with experimenting right?


Read through this thread. Lots of info and links. Do a search on my user name for more BDRI stuff including bias information. Have fun. :D

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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Tue Apr 24, 2012 12:50 am
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I did read through this thread and several of your posts. That's how I came up with the 12AY7 and 5157 comparison. You should know I am completely knew to this, so I'm trying to learn as much as I can.

The bias thing sounds scary. With the proper tools and care it should be a piece of cake, like you said (slightly different words :P). I will have to read up on that one again, don't want to be electrocuted. 80-85 seems a bit high though, doesn't it shorten the life span of those tubes a lot?

I will try one of your setups in the near future. Amp needs to be fixed first. :(


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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Tue Apr 24, 2012 5:36 am
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Biasing is only scary, if you don't know what can hurt you, or you have very shaky hands. Here's a link that I followed, step by step: http://www.musicradar.com/forum/showthread.php?t=53041

This is the most detailed explanation of how to bias, plus it has pics!

Last year, I was just like you. Didn't have a clue what I was doing. With the help of this forum, and numerous searches of the web, I have mutiple sites that I go to for help.

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2000 American Deluxe Stratocaster
2011 Gibson Les Paul Trad Pro 50's
2007 Epi Les Paul Custom
90's ESP Eclipse
JH-1B Jimi Hendrix Crybaby
Analogman KOT
Korg Pitchblack
Boss NS-2 PH-2
Blues Deluxe Reissue
1999 & 2007 Marshall TSL 100 w/1960BV cab


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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Tue Apr 24, 2012 7:40 am
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Lots of great sites on "how-to" bias an amp. The site linked to above, forgot to mention, recheck the bias after playing for awhile, it can and does drift a little after the initial setting, especially with new tubes. So, wait to put the cover back on until you have rechecked the bias after trying it for awhile.

Here is another great site to look at for biasing info, it has videos of Bob biasing amps. After reading the info first, scroll down to - "#1. Fender Hot Rod Deville / Deluxe Bias", it's the same procedure and component locations for the Blues Deluxe/Deville reissues.

http://www.eurotubes.com/eurotubes-how-to-bias-video-probe-Pro-One.htm

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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Tue Apr 24, 2012 8:18 am
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I came across some very helpful vids and websites indeed. Yours are good too!

I'm confident enough to do it myself now. I only need a multimeter so if anyone knows an accurate, not too expensive one which can be purchased in Europe, let me know! :P


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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Tue Apr 24, 2012 1:14 pm
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have been following this discussion, thanks all and for all the links.

I think I can probably try to bias my BDRI when it comes time for new power tubes

I have a digital multimeter, and will purchase the tool from AmpHead


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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Tue Apr 24, 2012 5:44 pm
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jaymie66 wrote:
The bias thing sounds scary. With the proper tools and care it should be a piece of cake, like you said (slightly different words :P). I will have to read up on that one again, don't want to be electrocuted. 80-85 seems a bit high though, doesn't it shorten the life span of those tubes a lot?


Definitely read up on amp bias. By itself, the voltage reading at the Fender test point is meaningless. Checking the bias consists of measureing BOTH the cathode current (which is what the Fender test point is for) AND the plate voltage. Those values are then used to calculate the approximate percentage of maximum plate dissipation.

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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Tue Apr 24, 2012 5:46 pm
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jaymie66 wrote:
I came across some very helpful vids and websites indeed. Yours are good too!

I'm confident enough to do it myself now. I only need a multimeter so if anyone knows an accurate, not too expensive one which can be purchased in Europe, let me know! :P


You also need a good bias probe to do it safely.

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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Tue Apr 24, 2012 6:03 pm
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OK, I'm learning, but have a lot more reading to do :!:

I didn't know you could vary the plate voltage

So is it a function of where you set the bias point?

Maybe I'll live longer if I take the amp to a qualified tech

But like a moth drawn to a flame, this fascinates me


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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Tue Apr 24, 2012 7:36 pm
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Rxtele wrote:
OK, I'm learning, but have a lot more reading to do :!:

I didn't know you could vary the plate voltage

So is it a function of where you set the bias point?

Maybe I'll live longer if I take the amp to a qualified tech

But like a moth drawn to a flame, this fascinates me


You don't vary the plate voltage. It varies on its own as a function of the plate current which is affected by the bias adjustment.

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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Wed Apr 25, 2012 7:19 am
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So I need this too?
http://www.eurotubes.com/eurotubes-Bias ... oltage.htm


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Post subject: Re: New Amp Day! Blues Deluxe Reissue
Posted: Wed Apr 25, 2012 11:45 am
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That's one way to go, but the EuroTubes probe is quite different from the rest. It actually breaks the circuit on one pin of the octal tube ("The Cheapest Solution"), and you measure current directly. Most other probes use a 1-ohm precision resistor (like the ones below), and the best ones put the resistor in the tube socket instead of in the box where the probes attach. The EuroTubes probes (even the more expensive version) only check one tube at a time, and you have to shut down, cool off, then switch the probe to the next tube.

I recommend this bias tool, I have been using for quite awhile. Great, accurate, and you can check up to four tubes at the same time. It comes with two probes, but you can add a couple more probes while ordering, or buy more probes later if needed. You can even get two octal probes and two 9-pin probes and be covered for most tube types. I have four of each type, octal and 9-pin.

http://www.ebay.com/itm/QuadStage-BiasPro-Tube-Audio-Amp-Biasing-Bias-Matching-Probe-Tester-Tool-/320892068346?pt=LH_DefaultDomain_0&hash=item4ab6a861fa

I liked it so much that I also bought the metered version, which is easier to use, no need for a separate meter.

http://www.ebay.com/itm/Meter-ed-QuadStage-BiasPro-MQ10-Audio-Amp-Tube-Bias-Matching-Probe-Tester-Tool-/320894181819?pt=LH_DefaultDomain_0&hash=item4ab6c8a1bb

Absolutely one of the best available! :D

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