Newbie TA-15 Tube question

Talk about tubes and their effect on your tone

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gibby58
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Newbie TA-15 Tube question

Post by gibby58 » Thu Jun 23, 2011 2:18 pm

I bought a demo TA-15 from Sweetwater. I'm loving the amp, but I had a Preamp tube go microphonic on me. I ordered a set of Tung-Sol's. I've read good things about them. I bought 4, but in the TA manual it says not to replace all the tubes at once. I've never heard of this before. Is that right?
Thank you in advance

dodger916
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Re: Newbie TA-15 Tube question

Post by dodger916 » Fri Jun 24, 2011 12:48 am

gibby58 wrote:I bought a demo TA-15 from Sweetwater. I'm loving the amp, but I had a Preamp tube go microphonic on me. I ordered a set of Tung-Sol's. I've read good things about them. I bought 4, but in the TA manual it says not to replace all the tubes at once. I've never heard of this before. Is that right?
Thank you in advance
If it's in the manual there's probably a good reason. Does it so why?

If you replace all tubes at once you're probably discarding good tubes. When dealing with a microphonic preamp tube, the commonly accepted procedure is to tap lightly on each tube with a pencil eraser while powered up to find the bad one. Another way is to replace each tube one at a time with a tube known to be good until the noise goes away. This way you'll isolate the bad tube.

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J.J
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Re: Newbie TA-15 Tube question

Post by J.J » Sat Jun 25, 2011 5:54 am

The Tung sol is a great tube and has been my favorite new tube for a few years now. It almost always has taken my amps to where I want them tone wise.

One thing though, more than one or two may be hard on your ears as they will tend to shift your tone to the bright side.

What I would do is find which tube is bad by substituting one of your new tubes into each slot. Then change your tubes around so that you have a Tungsol in V1 or whatever the first gain stage is and the stock tubes every where else.

Have a good play and decide if you like that and then perhaps target V2 and see if that was an improvement or not.
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gibby58
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Re: Newbie TA-15 Tube question

Post by gibby58 » Sat Jun 25, 2011 10:57 am

J.J wrote:The Tung sol is a great tube and has been my favorite new tube for a few years now. It almost always has taken my amps to where I want them tone wise.

One thing though, more than one or two may be hard on your ears as they will tend to shift your tone to the bright side.

What I would do is find which tube is bad by substituting one of your new tubes into each slot. Then change your tubes around so that you have a Tungsol in V1 or whatever the first gain stage is and the stock tubes every where else.

Have a good play and decide if you like that and then perhaps target V2 and see if that was an improvement or not.
Thank you, I get it now. I'll start with V1. Thanks again.

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J.J
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Re: Newbie TA-15 Tube question

Post by J.J » Sun Jun 26, 2011 8:44 am

Let us know how you go.
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Re: Newbie TA-15 Tube question

Post by mule#1 » Fri Jul 01, 2011 3:49 am

The pencil eraser trick works like a charm!

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