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Silvertone 1483


 
11/18/2003 5:48 PM
Drew Silvertone 1483
A pair of 6L6 feed a cabinet with a big 15in jensen. Why is there a choke across the speaker (and OT secondary)? Could you eliminate the choke and run two speakers in parallel? What is the purpose of the choke?
 
11/18/2003 7:08 PM
ewnorton
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Is this a bass amp? Could the choke have a purpose in a bass amp?
 
 
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11/19/2003 1:47 PM
Drew
Yes. I believe it is a bass amp.
 
11/19/2003 3:01 PM
Wild Bill
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Drew, are you absolutely certain it's a choke?  
 
A choke seems odd to me if run in parallel to a speaker. Inductors look like a low value short to bass frequencies and a higher resistance to treble, in a curve determined by the choke's value. Why would they bypass bass frequencies?  
 
I could see a choke used as some kind of impedance matching/power soak device. I could also understand if it were a higher-value resistor used as a no-load protection device.  
 
If it really is a choke are there any markings on it to indicate its value?  
 
---Wild Bill
 
11/19/2003 3:27 PM
Magamps
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Bill,  
I found a schematic link on Duncan's page...yep...it is a choke across the voice coil.  
Mike
 
11/19/2003 8:58 PM
Drew
The amp belongs to a relitive of mine, don't have it in my possesion, but from what I remember the choke was mounted in the cab - I didn't have much light, but it was about as big as my thumb, 14-16awg w/ ferite core or slug. Not too many turns, so I would imagine the DC resistance is pretty low.  
Someone on this site built a homebrew with one of these (Chris B.?), I might want to ask him some q's.  
 
Thanks.
 
11/19/2003 8:30 PM
Chris ( CMW amps )
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Hi Drew  
 
Just did check the schematic and "it does look weird" :) .  
The choke would cancel lows , can you measure the dc-resistance ?  
 
Chris
 
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