Hello,
I have a resistor in my amp, one end which is attached onto the barrier strip where the hot lead from the AC connects to the power transformer. The other end of the resistor is attached to a blank position on the barrier and goes nowhere/no connection points.
What is the purpose of this?
This is the wire wound resistor:
Mills
1.3K Ω +/- 10%
MRW-15
Thank You,
Joe
I have a resistor in my amp, one end which is attached onto the barrier strip where the hot lead from the AC connects to the power transformer. The other end of the resistor is attached to a blank position on the barrier and goes nowhere/no connection points.
What is the purpose of this?
This is the wire wound resistor:
Mills
1.3K Ω +/- 10%
MRW-15
Thank You,
Joe
Post a picture 🙂
If it's not connected at one end it's not used, and manufactures wouldn't "waste" the money of a redundant resistor.
Are there any "options" that can be fitted to whatever it is.
If it's not connected at one end it's not used, and manufactures wouldn't "waste" the money of a redundant resistor.
Are there any "options" that can be fitted to whatever it is.
I'd like to provide a pic but it's not possible atm. Got me thinking though, its a resistor that literally goes to nowhere, but is attached from position 1 (hot) to the unused portion of a 5 position barrier. The other 4 leads from the transformer are all attached to positions 1,2(jumpered together)3,4 (jumpered together). Then maybe the 5th unused position would have been for the purpose of a 240v arrangement for the transformer (it's 120v now). I dunno just guessing at this point but that would seem logical.
But I guess if it isn't going anywhere, I can remove it since its really just in the way of soldering at this point.
But I guess if it isn't going anywhere, I can remove it since its really just in the way of soldering at this point.
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oops-! It's the PS Audio 200c. I suppose I could email them as well, they are very responsive.
I forgot I had taken a picture of this, at these angles awhile back. Maybe this will shed light.
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I can only suggest as my earlier post that it's used with some "option" or other. Maybe a remote on/off function... relay board etc... dunno 🙂
Having a wire run over the top of something that could get hot (the resistor when used) isn't good.
Having a wire run over the top of something that could get hot (the resistor when used) isn't good.
That wire goes to the power switch, not my handywork. But hearing that makes me feel better about removing the resistor entirely, since its in the way for re-attachment. (the transformer has been pulled and sent out for service).
If the amp can be strapped for 220v operation, the resistor is likely used to drop the voltage to that power relay when used on 220v. The coil of the relay is probably 120v.
Sounds reasonable, I checked with Paul McGowen at PS Audio, too long to remember what it could be or was for, but he was leaning toward 220v (although, this would dramatically drop voltage?). Given the age of the amps, I'm sure there's been work on some of them, and I haven't seen 2 identical ones at this point.
Curious tho, if this Relay only requires a minimum of 1A@12VAC to turn on, why would I want to send a ton more anyway? Could lowering the voltage be helpful to maybe even quiet the coil down (it does have some mechanical hum).
I actually did find and old pic of one where is looks like this is going to the front panel switch. But there is no way to tell 100%, or what the ohm rating is and country of origin.
Also included pic of my layout for clarity.
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The relay is rated as a 120 vac coil and 10 watts. this means the current is 10/120 or about 83 ma... Now take the 1.3K resistor times 83 ma and you would drop 108 volts... so if we apply 220 to the resistor in series with the coil we would get about the desired 120 volts across the coil... I am now sure of what that resistor was used for... There would be about 10 watts dissipation in the resistor as well.
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