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Post subject: Hot Rod Deluxe tone going Bassy!
Posted: Thu Jul 23, 2009 8:11 pm
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My Hot Rod Deluxe is starting to sound bassy. I changed guitars no difference. The guitar with the P-90's and nanomag (Ultra II Les Paul) is muddy sounding...

Are my tubes pooched? Or is something else the culprit? The amp is only about 4 months old... :?

Any Ideas?

BTW I use the amp with the bass right off no drive and treble on six, reverb on five, middle on five...


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Posted: Thu Jul 23, 2009 10:38 pm
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What would cause my amp to go from "pristine" clarity to muddy sounding...

What says the guru's of Fenderville...?


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Posted: Thu Jul 23, 2009 11:48 pm
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I had a similar issue with an amp being kind of muddy and bassy after I played it pretty loud pretty long. Next time I fired it up it sounded like I had a blanket over it. Changing the preamp tubes cleared it back up considerably. Specifically V1 made the biggest difference.

Check if any of the pre tubes are microphonic. Power up the amp normally then when it is fully powered up and hot take a pencil eraser and tap the tubes. Don't hit the chassis. You barely have to tap them to hear it. They should amplify the thump. If they are microphonic they'll ring, crunch, or feedback, or some other non-thumpy sound. Replace the microphonic one(s). If they aren't microphonic and if you have some extra pre tubes, try changing out V1. That will be the one on the far right as you look at the back of the amp. Ideally try changing them all, but if you only have one spare then V1 will be the most likely culprit usually, then V2. V3 is the PI so I don't think there should be anything there causing it. It could possibly be on the power amp side with the 6L6s and V3, but I'd check pre amp side first.

If you already know how to do all that, then apologies in advance for spelling it all out. Just posted it out in case you don't to save any back and forth down time. Good luck!


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Posted: Fri Jul 24, 2009 5:51 am
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frostymug wrote:
I had a similar issue with an amp being kind of muddy and bassy after I played it pretty loud pretty long. Next time I fired it up it sounded like I had a blanket over it. Changing the preamp tubes cleared it back up considerably. Specifically V1 made the biggest difference.

Check if any of the pre tubes are microphonic. Power up the amp normally then when it is fully powered up and hot take a pencil eraser and tap the tubes. Don't hit the chassis. You barely have to tap them to hear it. They should amplify the thump. If they are microphonic they'll ring, crunch, or feedback, or some other non-thumpy sound. Replace the microphonic one(s). If they aren't microphonic and if you have some extra pre tubes, try changing out V1. That will be the one on the far right as you look at the back of the amp. Ideally try changing them all, but if you only have one spare then V1 will be the most likely culprit usually, then V2. V3 is the PI so I don't think there should be anything there causing it. It could possibly be on the power amp side with the 6L6s and V3, but I'd check pre amp side first.

If you already know how to do all that, then apologies in advance for spelling it all out. Just posted it out in case you don't to save any back and forth down time. Good luck!


Frostymug "you da man"...! Thanks for all the info! I don't play it loud, just in my house I play so the volume stays pretty low...

I'll give this a try and see what happens thanks :D


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Posted: Fri Jul 24, 2009 6:42 am
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Hey Frostymug...It's was exactly like you spelled it out! The V1 tube (far right) rang like a bell when I tapped it...! I'm going to change out the two far right tubes and go from there...

It's been a long time for me that I have had to deal with "tubes"...lol...


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Posted: Fri Jul 24, 2009 6:54 am
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Good deal! Glad that seems to have been the case. I usually change all the preamp tubes at the same time when one gets funky then save the non-microphonic one(s) to have backups on hand.

Hope that gets you rocking again! Or twanging, as the case may be.


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Posted: Fri Jul 24, 2009 7:27 am
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frostymug wrote:
Good deal! Glad that seems to have been the case. I usually change all the preamp tubes at the same time when one gets funky then save the non-microphonic one(s) to have backups on hand.

Hope that gets you rocking again! Or twanging, as the case may be.


I'm more of a twanger than a "banger"...lol...

I'll take your advice into hand...

Thanks


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