JObeast
Joined: Jul 24, 2012
Posts: 2762
Finknabad, Squinkistan
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Posted on Dec 22 2014 12:13 PM
Mu Gibbs pan has just "1122 6428" stamped on the outside and a big "C" inside. I take it that it was made in June 1964.
I experimented switching it with a Accutronics 4AB3C1B and there was no compatibility. I like the sound of the Gibbs, not too long a tail on it.
— Squink Out!
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BJB
Joined: Jul 28, 2008
Posts: 413
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Posted on Dec 22 2014 06:16 PM
eddiekatcher wrote:
Here's how ya do it...... Next time ya play out, take along a tape recorder, a cheezy one will work fine.....set it up in the middle of the room and play your set. Fiddle with the mix control and then listen to the playback later...... I think you'll find that your guitar will get lost in the mix when it's over-verbed (sorry jake).
In my experience, cheap tape recorders sound 'washy' because they have omnidirectional microphones that picks up sound from all over the room. Our ears are more directional so the recording is going to be more washy than what the audience hears. It's always good to record your performances, but if the recording is indistinct, are the reverb settings at fault or is it simply a bad recording?
— If it ain't broke, fix it until it is.
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LaFleur
Joined: May 20, 2009
Posts: 525
Leipzig
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Posted on Dec 23 2014 08:37 AM
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irv78
Joined: Jun 26, 2009
Posts: 99
Austria
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Posted on Dec 23 2014 10:25 AM
The easiest way to make sure that the pan is compatible with your unit is to have the seller measure the input and output dc-resistance. The input should be around 1 Ohm and the output around 200 Ohms (+/-).
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JObeast
Joined: Jul 24, 2012
Posts: 2762
Finknabad, Squinkistan
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Posted on Dec 23 2014 11:45 AM
Yes LaFleur, the Gibbs C's impedance must be incompatible with that of the Fender Twin. LaFleur wrote:
So JOBeast, did I understand you correctly? The C version of the Gibbs didn't work in your tank?
— Squink Out!
Last edited: Dec 23, 2014 11:46:30
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LaFleur
Joined: May 20, 2009
Posts: 525
Leipzig
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Posted on Dec 23 2014 12:26 PM
Yes I know about the resistance measurement, but nearly no one on ebay wants to measure it...
— http://www.reverbnation.com/bangmustang
http://www.facebook.com/bangmustang
https://soundcloud.com/bang-mustang
Last edited: Dec 23, 2014 13:30:53
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dboomer
Joined: Jan 05, 2009
Posts: 262
Port Hueneme, CA
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Posted on Dec 23 2014 12:44 PM
I suspect that very few people can measure the "impedance". Measuring the "resistance" while easy to do, is something else.
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LaFleur
Joined: May 20, 2009
Posts: 525
Leipzig
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Posted on Dec 23 2014 01:32 PM
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HallmarkSweptWinger
Joined: Jul 27, 2006
Posts: 1284
Berlinesia, Germanifornia
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Posted on Dec 23 2014 03:39 PM
Oh this will getting to complicated for me…
What can I say? I am not lazy. I am simply ignorant
— Twang cheers!
Ralf Kilauea
www.kilaueas.de
https://kilaueas.bandcamp.com/album/touch-my-alien
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dboomer
Joined: Jan 05, 2009
Posts: 262
Port Hueneme, CA
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Posted on Dec 23 2014 03:48 PM
First, these things aren't exact. If you are looking for a typical Fender pan for a tube circuit Reverb the input side will have a resistance of about 1 ohm (as measured with a MultiMeter/VOM) and and impedance of about 8 ohms. The output side's resistance will be about 40 ohms and it's impedance will be about 2.2kOhms.
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irv78
Joined: Jun 26, 2009
Posts: 99
Austria
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Posted on Dec 23 2014 04:22 PM
dboomer wrote:
The output side's resistance will be about 40 ohms and it's impedance will be about 2.2kOhms.
According to my sources the output's dc-resistance has to be around 200 Ohms:
amplifiedparts.com
—
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LaFleur
Joined: May 20, 2009
Posts: 525
Leipzig
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Posted on Dec 23 2014 05:21 PM
yes: "1 ohm (as measured with a MultiMeter/VOM) and and impedance of about 8 ohms. The output side's resistance will be about 200 ohms and it's impedance will be about 2.2kOhms."
— http://www.reverbnation.com/bangmustang
http://www.facebook.com/bangmustang
https://soundcloud.com/bang-mustang
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DannySnyder
Joined: Mar 02, 2006
Posts: 11046
Berkeley, CA
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Posted on Dec 23 2014 08:08 PM
I've found more often than not people will measure. When contacting seller I ask if they have an multimeter and would they check the resistance by putting the leads across each of the 2 jacks. Makes it sound a lot easier than just asking what the impedance is.
— Danny Snyder
"With great reverb comes great responsibility" - Uncle Leo
Playing keys and guitar with Combo Tezeta
Formerly a guitarist in The TomorrowMen and Meshugga Beach Party
Latest surf project - Now That's What I Call SURF
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Badger
Joined: Nov 16, 2013
Posts: 4536
Wisconsin
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Posted on Dec 23 2014 09:23 PM
LaFleur wrote:
Just found this information:
"Gibbs model L, is an Accutronics model number 4FB2B2C"
So we need to find out what is C and what is F.
4 Type 4 pan
F Input 1475 ohms
B Output 2250 ohms
2 Medium decay
B Input grounded/output insulated
2 ? (refers to locking device)
C Mount vertically, connectors up
Reference source for "pan code"
Merry Christmas.
— 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.
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LaFleur
Joined: May 20, 2009
Posts: 525
Leipzig
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Posted on Dec 24 2014 03:42 AM
Badger wrote:
LaFleur wrote:
Just found this information:
"Gibbs model L, is an Accutronics model number 4FB2B2C"
So we need to find out what is C and what is F.
4 Type 4 pan
F Input 1475 ohms
B Output 2250 ohms
2 Medium decay
B Input grounded/output insulated
2 ? (refers to locking device)
C Mount vertically, connectors up
Reference source for "pan code"
Merry Christmas.
I meant the C and F stamp inside the Gibbs pan, but thanks anyway...
— http://www.reverbnation.com/bangmustang
http://www.facebook.com/bangmustang
https://soundcloud.com/bang-mustang
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Badger
Joined: Nov 16, 2013
Posts: 4536
Wisconsin
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Posted on Dec 24 2014 03:52 AM
LaFleur wrote:
I meant the C and F stamp inside the Gibbs pan, but thanks anyway...
Ahh.
— 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.
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JObeast
Joined: Jul 24, 2012
Posts: 2762
Finknabad, Squinkistan
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Posted on Dec 24 2014 12:01 PM
My pan marked "C" is hung horizontally & upside down in the cabinet, secured by screws through the top panel of the Gibson RV3 unit.
— Squink Out!
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Badger
Joined: Nov 16, 2013
Posts: 4536
Wisconsin
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Posted on Dec 24 2014 01:04 PM
JObeast wrote:
My pan marked "C" is hung horizontally & upside down in the cabinet, secured by screws through the top panel of the Gibson RV3 unit.
When I got my RI Fender 2nd-hand, it had the "wrong" pan in it (which I noticed when putting a MOD pan in), although it was electrically same specs. I did not notice anything vast in difference because of how the connectors now were, or that it was hung as intended.
Funny you mention that. I think Ed contributed something awhile back to the Wiki about there being some "optimum" orientation based on air gap to transducer or something. Then again, my ears are still hearing alot of muzzle blast so it's possible I'd never detect anything. Maybe the electrical specs and the TYPE of pan (springs & delay) are what we're really hearing. Don't know that one or another orientation contributes or detracts from life of the pan.
(Ahh, the calm before the storm of little one's descending on house later today.)
— 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.
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LaFleur
Joined: May 20, 2009
Posts: 525
Leipzig
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Posted on Dec 25 2014 01:22 PM
JObeast, can you measure the resistance over the Gibbs C pan? So we could make some kinda database for the Gibbs pans.
— http://www.reverbnation.com/bangmustang
http://www.facebook.com/bangmustang
https://soundcloud.com/bang-mustang
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JObeast
Joined: Jul 24, 2012
Posts: 2762
Finknabad, Squinkistan
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Posted on Dec 25 2014 04:02 PM
Sure thing. I'll post results when I get them.
Meli Kalikimaka!
— Squink Out!
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