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100V amp to modifying 220V - Peavey 5150
100V amp to modifying 220V - Peavey 5150
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Old 31st October 2019, 02:54 PM   #11
BJosephs is offline BJosephs  United States
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Originally Posted by venndi View Post
With your method would be 220V or 120V? Also are you sure that it works in that way?
Unused taps are always left unconnected. If there are other windings sometimes that need a series or parallel connection to be made but that is not applicable here.

Transformers are electrically isolated coils of wire that are coupled magnetically to one another. The ratio of the windings from primary to secondary determines the ratio of voltage and the inverse ratio of current. A transformer designed for 220 volt service vs. 110 will have twice the number of primary windings and probably a smaller gage wire (because current will be 1/2 and space will be needed for the additional windings). This is why you are unlikely to find a transformer that can handle both incoming power types with simply an additional tap. If you look at Hammond's tube amp transformers they have 115v versions and “universal” versions. The universal versions have multiple windings that are connected in series or parallel to accommodate a wide range of input voltage. They have taps for small adjustments.

Last edited by BJosephs; 31st October 2019 at 03:03 PM.
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Old 1st November 2019, 01:34 AM   #12
leadbelly is online now leadbelly  Canada
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Not much to add, other than my guess is the BL tap is 110VAC.

A lot has been said already. Maybe you can find a 230V/115V autoformer, that'll help with the practicalities of bulk and weight.
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Old 1st November 2019, 08:51 AM   #13
mandu is offline mandu  Singapore
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higher powered devices, if there is a transformer that can be connected to 110 or 220 volts will have 4 wires on the primary. These types are designed to be connected in parallel for 110 v or 220 v in series. Not a single tap as in the drawing. The tap may be 110/120 volts connections, but don't trust anyone's word. Best is to get a 240/110 auto transformer which when connected to 220 will output nearly 100 volts. Regards.
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Old 2nd November 2019, 07:31 PM   #14
knockbill is offline knockbill  United States
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Originally Posted by PRR View Post
It is very-very unlikely the 100V version has a 230V tap. (100V + 120V is more likely, but not proven.)
IF the unused blue wire will provide 120V,, he could connect it, and use a more common 120V-240V adapter (boost tx)... May not be ideal, but could eliminate expensive shipping...
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Old 8th November 2019, 06:58 PM   #15
Gnobuddy is offline Gnobuddy  Canada
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Originally Posted by PRR View Post
...you *may* be able to get the stock PT re-wound.
Isn't Peavey one of the manufacturers that welds up the corners of their power transformers? If that's the case in this particular model, there's no chance of rewinding it.

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Old 8th November 2019, 09:24 PM   #16
JMFahey is offline JMFahey  Argentina
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Originally Posted by JonSnell Electronic View Post
Identify the transformer type number and if it has the BL unused, disconnect the wire going to BA and connect it to BL.
Wire the amplifier with a 3 core power cable. REMOVE the capacitor of death, the one that goes to the switch between Live and Neutral and fit the earth wire from the three core mains lead, to the chassis.

If anything, it MIGHT convert a 100V primary to a 120V one but it will NEVER EVER CONVERT IT TO 220/230/240V which is what the OP is asking.

Your unqualified suggestion hints at it being possible, which it is NOT.

Cīmon jonsnell, you are an experienced Tech, what were you thinking?

Leave it open with no wire connected

Did you read the thread title?:
100V amp to modifying 220V
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.

Last edited by JMFahey; 8th November 2019 at 09:32 PM.
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