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Post subject: Fender hot rod deville wiring question...........
Posted: Mon Jun 14, 2010 3:19 am
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just wondering if anyone could shed any light on my current predicament,

as you are aware, my hot rod deville has two 8ohm speakers in it they are wired up like so

"speaker 1" positive leg to "speaker 2" positive leg

"speaker 1" negative leg to "speaker 2" negative leg

jack plug from positive and negative leg of "speaker 1"

can anyone shed any light on to whether this is series or parallel wiring and/or what the overall ohm rating would be (I'm led to believe this is series and will therefore be a total 8 ohm load)

any help is much appreciated


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Posted: Mon Jun 14, 2010 4:17 am
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This is parallele wiring

Fender use always ( in Combo) 8 ohms speakers. So two 8 ohms in parallele is 4 ohms total load on your amp


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Posted: Mon Jun 14, 2010 4:17 am
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Hello,

This is a parallel wiring with 8Ohms each speaker (~4 Ohms).

Please refer to the schematic: http://www.fender.com/support/amplifier_schematics.php

:P

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Posted: Mon Jun 14, 2010 4:42 am
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I'm assuming that I would need a 4 ohm hot plate then?!

can anyone shed any light therefore on why I have been told on more occassions that I can count that the 8 ohm hot plate is the one needed for my amplifier?! is there any specific reason for this that anyone knows of that I may have missed?!

would using an 8 ohm hot plate damage my amp at all?!


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Posted: Mon Jun 14, 2010 5:53 am
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You use HotPlate because you want to cranck up your amp. lts a lot of power to go to uour power tubes and transformer. They work hard.

I can't tell for sure you won't damage your amp but is not good for your power tubes and transformer. Use a 4 ohms Hot Plate.

You already have a 8 ohms HPlate ? Better sell it and buy 4 ohms


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Posted: Mon Jun 14, 2010 6:14 am
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Even if you run a 4 ohm Hotplate and run your amp flat out a lot, it will be really hard on your power tubes and you'll have to replace them more often.
Don't confuse speaker ohm rating with the total load the transformer wants to see. Fender uses different combination's of 8 ohm speakers to get a total load from 2 ohms, 4 ohms, just 1 single 8 ohm speaker.

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Posted: Mon Jun 14, 2010 8:20 am
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that's it settled then, will sell my 8 ohm hot plate and get a 4 ohm hot plate!!!!

many thanks for everyones help and advice and input

oh, anyone want to buy or swap an 8 ohm hot plate at all?! hahaha


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Posted: Mon Jun 14, 2010 12:44 pm
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I think that the HRD has been design for 2 Ohms to 8 Ohms then the 8 Ohms Hot plate should work but make sure it can be 60W.
May be Stratele52 can confirm.
Nevertheless valves and transfo will warm more and less life time.

:P :P :P

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Posted: Mon Jun 14, 2010 2:05 pm
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I Just check HRDeville schematic and they said about the 2 out put jacks that they are 8 ohms each.

hippiedan, maybe a made a mistake Your speaker could be 16 ohms each ? To give a 8 ohms load to your amp ? I don't know. I'm sorry
That's new to me that fender use 16 ohms speaker.

Are ther a number on your speaker n(Jensen ?) we can find how many ohms ?

Your 8 ohms THD could work.


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Post subject: Hot Rod Deville Speaker Configurations
Posted: Wed Jun 30, 2010 6:30 am
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stratele52 wrote:
I Just check HRDeville schematic and they said about the 2 out put jacks that they are 8 ohms each.

hippiedan, maybe a made a mistake Your speaker could be 16 ohms each ? To give a 8 ohms load to your amp ? I don't know. I'm sorry
That's new to me that fender use 16 ohms speaker.

Are ther a number on your speaker n(Jensen ?) we can find how many ohms ? Your 8 ohms THD could work.


Only one of the output jacks on your amp is used for your two existing speakers. Both of your existing speakers are 8 ohms each, in parallel, making 4 ohms which is connected to only one output jack. The other output jack can be used for another speaker connection.

The HRDeville can run a 2, 4 or 8 ohm total speaker configuration using 1 output jack, or both output jacks, the manual lists possible connections under "V. Main Speaker". I have the 4x10 version myself. Hope this helps, and BTW your English is fine! :wink:


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Posted: Wed Jun 30, 2010 9:42 am
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hippiedan wrote:
that's it settled then, will sell my 8 ohm hot plate and get a 4 ohm hot plate!!!!

many thanks for everyones help and advice and input

oh, anyone want to buy or swap an 8 ohm hot plate at all?! hahaha


How much? :D

And as a side note, i ALWAYS double check the resistance of the speaker load with my multimeter before hooking them up after having disconnected, and periodically between then. More than once i've had speaker wiring in a fender amp go bad but was able to catch the problem by checking myself. Note that since it is DC Resistance rather than impedance the number will usually be slightly lower than the quoted number, usually within 1.5 ohms. Definitely a nice safety net, and even a fairly nice multimeter is cheaper than a new Output transformer...! [/i]


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