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FDP Forum / Amp Mods, Repairs, and Projects / Reverb Tank: 2 vs. 3 springs?



Helloooo, ball!
Apr 14th, 2003 11:43 AM   Edit   Profile  

Hello All,

I'm looking to replace the reverb tank in my '67 Deluxe Reverb. Its stock tank is the regular 2-pring type. The 3-spring units are tagged "long delay". Does that just mean that they will have more dwell, or will it also be more prevalent in the mix, relatively speaking in comparison to the 2-spring unit? Thanks in advance.


United Kingdom

Apr 14th, 2003 03:27 PM   Edit   Profile  

I'm about to replace mine too! Steve Dallman (contributing member) prefers the 2 spring but he doesn't say why.


I could really use an answer to this...so fingers crossed!


Tele-wielding .....

Ooops ... did I offend someone??
Apr 15th, 2003 09:31 AM   Edit   Profile  

Easy! I tried a three-spring in my BFPR which made the Reverb unusable (too thick).

Unless you can get a medium delay 3-spring tank, it has to be two-spring.

Steve Dallman
Contributing Member


Tiffany and I are happy in Appleton WI!
Apr 16th, 2003 07:09 AM   Edit   Profile  

I have heard lush 2 springs and not-so-hot 3 springs that weren't all that deep. I had a great 3 spring (that was a bit too much) in my 67 DR for years, but when I put a newer 2 spring in, I liked the sound better. These things can be pretty spotty. Just because a unit has 3 springs doesn't necessarily mean it will be better.

For instance, short tanks...I've yet to hear a short 3 spring that comes close to a full size tank, but I've got a few short tanks that Peavey uses that have a "single" spring in a "Z" formation that sound great.

When changing or adding a reverb tank, I like to have a couple different types laying around to try, then I go with the one that sounds the best.



Don't fear the reverb
Apr 16th, 2003 11:09 AM   Edit   Profile  

I may get laughed at but here goes - is there any mod to make the 'verb in my HRDx sound more "spitty" like a free standing Fender Reverb unit? I did the R103(?) mod, and it did improve the tone, but it's not like that splashy sound the unit makes..

Contributing Member

God Bless Texas

Apr 16th, 2003 05:32 PM   Edit   Profile  

I tried the 3-spring medium delay with very good results.

Contributing Member


Apr 16th, 2003 06:04 PM   Edit   Profile  

I used a three spring medium in a Peavey LTD400, a great improvement for this amp.

(This message was last edited by Fenderonly at 07:32 PM, Apr 16th, 2003)

Contributing Member

USA/North Texas

Anybody got some glue? I'm fallin apart!
Apr 16th, 2003 06:59 PM   Edit   Profile  

I have a very nice sounding 3 spring in my JC-90, however they toned it down a bit with a higher value resistance (2X the resistance of the main audio line). It has a medium delay. I think it depends on the amplifiers reverb circuitry and your tastes. One thing I have read is the preferred mounting method is on the side of the amp vs. the bottom. This is reported to give the cleanest reverberation with the least effects from the outside world..i.e. vibrations from the amp itself.
Make sure you get the proper input/output impedance match for your reverb as required by your amps circuitry. The code on the reverb tank will help in that area.

Contributing Member

God Bless Texas

Apr 16th, 2003 11:00 PM   Edit   Profile  

My 3-spring with medium delay is in my Vibroverb clone (which started as a Super Reverb).



Helloooo, ball!
Apr 16th, 2003 11:08 PM   Edit   Profile  

Well, I just ordered the regular 2-spring unit (#4AB3C1B) from Antiques Electronics, as well as a few replacement Sprague 25uF @ 25V Atoms for the bypass caps. As long as it sound like it supposed to sound on a properly-running Deluxe Reverb, I'll be fine.

Steve Dallman
Contributing Member


Tiffany and I are happy in Appleton WI!
Apr 17th, 2003 09:51 AM   Edit   Profile  

iceman, let us know how it turns out. I think you'll be happy. We just put one of those tanks in AlPike's SFDR and he was pleased.

Dolemite, I think that splashy sound you are looking for would take hitting the reverb tank input harder. A stand alone reverb has a dwell control, which controls how hard the reverb tank is hit.

Find R33, a 4.7k resistor. Replace this with a larger value. Try 10k, or even 22k.

This will kick up the gain of the reverb drive. Now this CAN cause some trouble. It will make the drive amp more sensitive and at some point you may overdrive that amp. However, even if you get a little distortion in this amp, the reverb tank will smooth out a lot of that. You might even want to replace the 4.7k R33 with a 20k trimpot in series with a 4.7k resistor, so you can dial in your desired drive.



Helloooo, ball!
Apr 17th, 2003 10:56 AM   Edit   Profile  

Thanks for the encouragement, Steve. I'm not necessarily a reverb fanatic, as a lot of it get's lost when you're playing with a band. It's more of a tonal thing. Anyone who's familiar with the classic BF Fender reverb amps knows that the reverb circuit adds some sweetness and spank to the tone of the amp, and even though the reverb does work on my late-'67 Silverface DR, it's a little weak up to about 4, and then it has a long trail. The bypass caps look to be original, in that they are the "1 in/2 out" black barrel type with the burgundy ends. The tank seems to be in good shape, but these things do age, so I figured I'd cover both ends to see what's up. I've cleaned all the contact points, and even tried replacing the pot, but simply cleaning the original with contact cleaner was all that was really needed, as it wasn't affecting things too much.

This amp has really become my baby over the last few years (it's the one piece of gear that I would never consider trading for anything), so I want to feed it right.



Helloooo, ball!
Apr 24th, 2003 11:35 AM   Edit   Profile  

Well, I just replaced the old tank. Not a huge difference, but there were some improvements. Firstly, the mix is a bit more present at lower settings. Secondly, the old tank had a bit of a nasty trail-off, sort of buzzy, and it would take a while for it to die off. This new Accutronics tank doesn't trail off as long, or at least with the same sort of buzziness of the old one. I got two Sprague Atom 25uf @ 25V bypass caps, and I have two more on the way, so I'll be replacing the old bypass caps in both the driver and recovery part of the circuit, which should get everything back up to snuff. Thanks for all the replies.



Apr 24th, 2003 11:55 AM   Edit   Profile  

It depends on the sound YOU want. Buy a 2 spring and a 3 spring reverb tank(s) and, pick the one you like best. You should try some short and long tanks too.

FDP Forum / Amp Mods, Repairs, and Projects / Reverb Tank: 2 vs. 3 springs?

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