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SurfGuitar101 Forums » Gear »

Permalink Gibbs reverb pan just installed...

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This might be of help to some, as well as feed the search engine for those who come later. Note that 'impedance' ratings (ala the common number codes) are not the DC resistance you'll get checking with a simple meter; important to know what one is checking for.
Smile

image

Wes
SoCal ex-pat with a snow shovel

DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices.

Oops, I should have said resistance. Typically you want approx 1-2Ω on the input and 170Ω on the output

Danny Snyder

Latest project - Now That's What I Call SURF
_
"With great reverb comes great responsibility" - Uncle Leo

I'm back playing keys and guitar with Combo Tezeta

The A023580-15 is also stamped R inside.

http://www.reverbnation.com/bangmustang
http://www.facebook.com/bangmustang
https://soundcloud.com/bang-mustang

AO23580-18 is stamped 4V inside. Don't know the resistance yet.

http://www.reverbnation.com/bangmustang
http://www.facebook.com/bangmustang
https://soundcloud.com/bang-mustang

My AO-23580-17 4U measured 1.7Ω (white transducer)
and 200Ω (red transducer).Grounded on the output side.

Last edited: Mar 13, 2016 13:03:39

Anecdote, I just bought a Gibbs L pan off ebay, like the OP from years ago I also have to turn up things, and it sounds amazing. I did have to spray it with contact cleaner and get the RCA jacks to make full contact.

INPUT RESISTANCE IS 170 OHM. OUTPUT RESISTANCE IS 177 OHMS according to the seller (not sure how that makes sense, but whatever.

Now its Drip, perfect decay and no annoying overly metallic overtones...

I think the springs and the quality of steel probably have to do with the sound, like how vintage transformers sound "better" or whatnot I guess. I debated just swapping the springs into one of my modern pans, but decided that was too much of a hassle.

Last edited: May 01, 2017 13:54:48

Sorry, but you bought a pan that's not really compatible with a Fender reverb unit. One post above you shows the colors/ranges you should look for. I believe yours is Red/Red. Yes, your pan does work, but it's not optimized, that's why you need turn things up. I believe you will be much happier with a proper pan.
If you don't play in a band, it might not be as critical, but in a band situation, it will make a difference.
Good luck,
Ran

The Scimitars

Duh! Thanks your right. I had to re-read this thread a few times to really get it. I thought the colors were for the rca jack inputs.. mine are white and red, but the transducer things are red/red and I completely ignored the specs the seller posted. Id10T error!

I like the sound though as I mentioned above. I might try migrating the springs, or I'll just sell it and move along (was only $20).

Yeah, they are not expensive, just be on the lookout, the right ones come up every 1-3 months.
All the best,
Ran

The Scimitars

AO-23580-18 is stamped 4V in the inside. It has 180 ohms on the Input and 180ohms on the output.

http://www.reverbnation.com/bangmustang
http://www.facebook.com/bangmustang
https://soundcloud.com/bang-mustang

LaFleur wrote:

AO-23580-18 is stamped 4V in the inside. It has 180 ohms on the Input and 180ohms on the output.

I've found that won't work. The input should be between 1 and 2 ohms.

Danny Snyder

Latest project - Now That's What I Call SURF
_
"With great reverb comes great responsibility" - Uncle Leo

I'm back playing keys and guitar with Combo Tezeta

I know Danny. I just want to create a kinda database, where people can inform themself, if they find a pan on ebay.

http://www.reverbnation.com/bangmustang
http://www.facebook.com/bangmustang
https://soundcloud.com/bang-mustang

thanks for doing that, everyone!

I have a salvaged Gibbs/Hammond with the following codes:

A023580-15
1122 - 6347
R stamped inside

thanks to this site, I now know:
1122 = mfr code
6347 = 47th week of 1963

I can't tell if the tape is yellow, or just old faded white?

output measures approx 175 ohm resistance, could not get a reading on the input, but I'm an electrical noob

LaFleur, what tank are you using your A023580-15 in? if it is working for you, I can figure out what amp/circuit to use mine in.

I wonder what the "R" stands for? mine was out of an old abandoned organ

Guys and gals this is amazing info thanks a million! I am on the hunt for a Gibbs pan to put in my G-Spring.... Time to dust off the multimeter

Robbin Henley (Men in Grey Suits HONOLULU)

https://www.facebook.com/Men-In-Grey-Suits-207897529235582/

www.meningreysuits.com

So if the input is 180 Ohm and it still sounds good (albeit higher settings on the control pots), is it usable or will it stress components in the tube circuit / transformers etc.?

Robbin Henley (Men in Grey Suits HONOLULU)

https://www.facebook.com/Men-In-Grey-Suits-207897529235582/

www.meningreysuits.com

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