Reverb tank replacement?

BenPerkins

Joined: Oct 19, 2011
Posts: 147
United States

Posted on Apr 02 2016 12:56 PM

Hi all,

I have a Carvin Belair 212 with a 4FB2A1B reverb tank. The reverb is pretty weak - I'm thinking of replacing the tank with something better (more Fender sounding). Any recommendations? Should I go with 4AB3C1C?

Thank you.

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I want to hear Caravan with a drum solo.

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artdecade

Joined: Aug 30, 2012
Posts: 399
Twangsville
United States

Posted on Apr 02 2016 01:05 PM

Must be an older Carvin. I think the new ones are digital, aren't they?

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To Boldly go where no Tiki has gone before...

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wfoguy

Joined: Dec 11, 2011
Posts: 2137
United States

Posted on Apr 02 2016 01:51 PM

Here's your answer. The link is for a pdf.
https://www.amplifiedparts.com/tech_corner/spring_reverb_tanks_explained_and_compared

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BenPerkins

Joined: Oct 19, 2011
Posts: 147
United States

Posted on Apr 02 2016 01:59 PM

Correct - older model

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I want to hear Caravan with a drum solo.

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BenPerkins

Joined: Oct 19, 2011
Posts: 147
United States

Posted on Apr 02 2016 03:02 PM

Based on the pdf, it sounds like I need a 4FB3A1B to get more of a Fender (wet) reverb? Or can I put whatever tank I want in there as long as the input/output impedance matches?

—

I want to hear Caravan with a drum solo.

Last edited: Apr 02, 2016 15:33:06

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BenPerkins

Joined: Oct 19, 2011
Posts: 147
United States

Posted on Apr 07 2016 10:28 PM

So... bought a 4FB3A1B and installed it. I can turn the reverb up to about 50% before it starts this oscillating (sounds like a UFO, LOL). Anyone know what this is and how I can fix it? Thanks

—

I want to hear Caravan with a drum solo.

Top

JObeast

Joined: Jul 24, 2012
Posts: 2762
Finknabad, Squinkistan
Turkmenistan

Posted on Apr 08 2016 04:19 AM

You may have a microphonic vacuum tube. Ping each of them with a pencil's eraser while the unit is on to see.

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Squink Out!

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Gilette

Joined: May 04, 2014
Posts: 734
Montserrat

Posted on Apr 08 2016 04:29 AM

Ben, is the pan in a bag or screwed to the bottom of the amp?

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BenPerkins

Joined: Oct 19, 2011
Posts: 147
United States

Posted on Apr 08 2016 08:43 AM

Gilette wrote:

Ben, is the pan in a bag or screwed to the bottom of the amp?

Hi Gilette, it's screwed to the bottom of the amp, open end down as was installed previously.

I went ahead and ordered a Tuki reverb bag just in case, but will also check the tubes this weekend. I appreciate your feedback!

—

I want to hear Caravan with a drum solo.

Top

BenPerkins

Joined: Oct 19, 2011
Posts: 147
United States

Posted on Apr 09 2016 01:27 PM

While I'm waiting for the reverb tank bag, I went ahead and put a small blanket over the reverb tank - oscillation went away. Case closed!

The reverb is okay - not the best, but gets better with a Topanga and Naga Viper in front. Thanks to everyone for their input.

—

I want to hear Caravan with a drum solo.

Top

BenPerkins Joined: Oct 19, 2011 Posts: 147	Posted on Apr 02 2016 12:56 PM Hi all, I have a Carvin Belair 212 with a 4FB2A1B reverb tank. The reverb is pretty weak - I'm thinking of replacing the tank with something better (more Fender sounding). Any recommendations? Should I go with 4AB3C1C? Thank you. — I want to hear Caravan with a drum solo. Top
artdecade Joined: Aug 30, 2012 Posts: 399 Twangsville	Posted on Apr 02 2016 01:05 PM Must be an older Carvin. I think the new ones are digital, aren't they? — To Boldly go where no Tiki has gone before... Top
wfoguy Joined: Dec 11, 2011 Posts: 2137	Posted on Apr 02 2016 01:51 PM Here's your answer. The link is for a pdf. https://www.amplifiedparts.com/tech_corner/spring_reverb_tanks_explained_and_compared Top
BenPerkins Joined: Oct 19, 2011 Posts: 147	Posted on Apr 02 2016 01:59 PM Correct - older model — I want to hear Caravan with a drum solo. Top
BenPerkins Joined: Oct 19, 2011 Posts: 147	Posted on Apr 02 2016 03:02 PM Based on the pdf, it sounds like I need a 4FB3A1B to get more of a Fender (wet) reverb? Or can I put whatever tank I want in there as long as the input/output impedance matches? — I want to hear Caravan with a drum solo. Last edited: Apr 02, 2016 15:33:06 Top
BenPerkins Joined: Oct 19, 2011 Posts: 147	Posted on Apr 07 2016 10:28 PM So... bought a 4FB3A1B and installed it. I can turn the reverb up to about 50% before it starts this oscillating (sounds like a UFO, LOL). Anyone know what this is and how I can fix it? Thanks — I want to hear Caravan with a drum solo. Top
JObeast Joined: Jul 24, 2012 Posts: 2762 Finknabad, Squinkistan	Posted on Apr 08 2016 04:19 AM You may have a microphonic vacuum tube. Ping each of them with a pencil's eraser while the unit is on to see. — Squink Out! Top
Gilette Joined: May 04, 2014 Posts: 734	Posted on Apr 08 2016 04:29 AM Ben, is the pan in a bag or screwed to the bottom of the amp? Top
BenPerkins Joined: Oct 19, 2011 Posts: 147	Posted on Apr 08 2016 08:43 AM Gilette wrote: Ben, is the pan in a bag or screwed to the bottom of the amp? Hi Gilette, it's screwed to the bottom of the amp, open end down as was installed previously. I went ahead and ordered a Tuki reverb bag just in case, but will also check the tubes this weekend. I appreciate your feedback! — I want to hear Caravan with a drum solo. Top
BenPerkins Joined: Oct 19, 2011 Posts: 147	Posted on Apr 09 2016 01:27 PM While I'm waiting for the reverb tank bag, I went ahead and put a small blanket over the reverb tank - oscillation went away. Case closed! The reverb is okay - not the best, but gets better with a Topanga and Naga Viper in front. Thanks to everyone for their input. — I want to hear Caravan with a drum solo. Top

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Reverb tank replacement?