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Post subject: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Mon Sep 07, 2015 10:07 am
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I have a number of different tube amps, and a '63 RI Fender Reverb Tank all with tube driven spring reverb, and I have a question for you guys that's been on my mind for some time.

Is it just me, or possibly my old bandmate's particular amp, but it seems that the newer spring reverb systems are not as bump sensitive as the older original Fenders of the '60's used to be?
I can clearly remember my bandmate getting very exercised if anyone gently bumped his (new at the time) ~1965 tweed ???? (unfortunately I just don't remember the exact model anymore) and the reverb would loudly splash for some extended time, just like the intro to Wipeout.

Neither my Egnater Tourmaster head's spring reverb, my '63 RI Fender tank reverb, the '65 RI twin I had, nor the two new '68 Vibrolux amps (I just bought for a stereo set up) are anywhere near as sensitive/easy to get to splash like that.
His amp would splash even if you just stomped on the floor a bit too hard.

I'm not advocating that as a wise thing to do, but just curious as to what's up with that????
Have they made modern spring reverb circuity/isolation mounting more 'bump immune' or has all my spring reverb equipment been coincidentally shot up with electronic Novocain? :wink:


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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Mon Sep 07, 2015 11:02 am
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Perhaps it's the difference between the contemporary junk from Korea and the original Gibbs/Hammond spring units made in Indiana......

Arjay

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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Mon Sep 07, 2015 11:06 am
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Arjay beat me to it. USA made Accutronics tanks (Hammond) are no longer built. They are now made in Korea and they are currently in competition with two other companies in the verb tank biz; Mod and Belton. Korean Accutronics tanks are less immediate than the old USA ones. They seem to be slower to respond. Mod tanks can be efficient but Belton tanks are also slow.

You could also check to see if the tank is rubber mounted and if it has a bag covering it.

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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Mon Sep 07, 2015 2:57 pm
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Even the old tanks wouldn't react to foot stomps.
I would suggest that your friend's tank had a problem.
The sensitivity that you describe occurs when the a spring breaks off the driven end. This leaves the output connected to one spring that is lying at the bottom and one spring that still works.
It goes microphonic as all get out


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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Sun Oct 11, 2015 10:01 am
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Interesting topic. About six months ago I built a MODKits DIY tube driven Wave Reverb unit. Naturally it uses a MOD reverb tank. The reverb tank is mounted directly to the chassis with no mechanical isolation whatsoever. Surprisingly it very shock resistant. This unit sounds more cavernous than splashy. It took me a little while to get used to it, but I really like it. You have to give it a pretty good shot before you get any kind shotgun noise out of it. It's a long spring unit. I don't know if that has anything to do with it.

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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Sun Oct 11, 2015 2:42 pm
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I've been trying to track down a original USA Accutronics 4AB3C1C if anyone has a lead on one for sale? will pay decent $$ for one in good condition.


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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Sun Oct 11, 2015 3:23 pm
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my56strat wrote:
I've been trying to track down a original USA Accutronics 4AB3C1C if anyone has a lead on one for sale? will pay decent $$ for one in good condition.


Ebay is a good place to start.

Arjay

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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Sun Oct 11, 2015 3:27 pm
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Thanks Arjay, they only seem to have 4AB3C1B's, been checking.


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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Sun Oct 18, 2015 8:09 am
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http://amprepairparts.com/reverb.htmHas anyone tried the Revist reverb tanks(made in USA?)? trying to find out more about them, not much info on the web.I see they do have the 4AB3C1C model I need.


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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Mon Oct 19, 2015 11:58 am
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my56strat wrote:
http://amprepairparts.com/reverb.htmHas anyone tried the Revist reverb tanks(made in USA?)? trying to find out more about them, not much info on the web.I see they do have the 4AB3C1C model I need.

They look interesting. I'm considering giving one a shot just to see if there's a difference between them and my MOD tank.

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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Mon Oct 19, 2015 12:41 pm
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63supro wrote:
my56strat wrote:
http://amprepairparts.com/reverb.htmHas anyone tried the Revist reverb tanks(made in USA?)? trying to find out more about them, not much info on the web.I see they do have the 4AB3C1C model I need.

They look interesting. I'm considering giving one a shot just to see if there's a difference between them and my MOD tank.

I'm surpirised there is so little info out there on them.I believe someone stated they are made in the same place as the original USA tanks were made?


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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Mon Oct 19, 2015 12:57 pm
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Don't know, but the prices aren't that far off from the imports. I'm going to see if it will bolt directly to the unit I built. It's a true point to point build. Sounds really nice, not at all like a Fender verb but nice still the same.
Here's a couple of photos of it. It's a rack mount unit that I still have to get a face plate and cabinet for. I shot the photos. That's my day job.

Image

Here's a little of the inside.
Image

They have tanks that match the impedance of the unit, so I might give one a shot.
Thanks for the info. I like sourcing parts from the the U.S.A.

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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Mon Oct 19, 2015 3:55 pm
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Looks great, and really nice pics! If you get one from Revisit be sure to post pics and review.


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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Mon Oct 19, 2015 7:00 pm
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Those are great shots, the first thing I said to myself was "that's a pro product shot, I thought he said he built it, "lol , That is my day job as well.


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Post subject: Re: Question Re: bump sensitivity new spring reverbs Vs Old
Posted: Tue Oct 20, 2015 3:26 pm
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Thanks, I will for sure. I got into kit building a couple years ago. I built a ton of pedals, a Marshall 1974 clone, a 5e3 Deluxe and a couple of smaller amps. It's a lot of fun and not that hard. Little by little I'm learning the more technical end of of amp building. Fun stuff and highly recommended.

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