How do I remove these connectors

kipple · January 2022

I need to remove two of these type connectors they are the type that have the pinkish plastic/rubber ish covering on th end that looks like a shovel shape. How the F%ck do I remove then they just will not budge and I don't want to force them and break anything
https://i.imgur.com/Mz9Tmz2.jpg

BillDL · January 2022

Yes, they are "spade connectors" just as you find on speaker wiring, in cars, on washing machines, etc. Usually very gentle side-to-side wiggling while holding the body of the connector is the way to remove them.

kipple · January 2022

BillDL said:

Yes, they are "spade connectors" just as you find on speaker wiring, in cars, on washing machines, etc. Usually very gentle side-to-side wiggling while holding the body of the connector is the way to remove them.

They will not come off no matter what I try. There is a small pin in a hole inside holding them in place, It's some kind of locking tab/pin but I cannot figure out how to disengage the locking part

Spikeedog · January 2022

Do you have to slip a tiny flat-ended screwdriver into the spade and hold down a pin for them to slide out?

Roland · January 2022

Will the plastic covers pull back exposing the metal?

kipple · January 2022

Spikeedog said:

Do you have to slip a tiny flat-ended screwdriver into the spade and hold down a pin for them to slide out?

Nope I tried that and unfortunately they will not come off

kipple · January 2022

Spikeedog said:

Do you have to slip a tiny flat-ended screwdriver into the spade and hold down a pin for them to slide out?

There does not seem to be anyway to do that as the plastic covers are in the way and they are very rigid and they will not move out of the way.
The actual connectors I need to remove are on the circuit board so I need to be careful not to cause any damage by putting too much pressure on the connectors as the leads are fron the mains tranny. I'm trying to change the amp from 230v to 240v byt don't look like it's going to happen anytime soon

Funkfingers · January 2022

kipple said:
I'm trying to change the amp from 230v to 240v

Why? The change should be well within tolerance.

+10% = 253v
-6% = c. 217v

kipple · January 2022

Funkfingers said:

kipple said:
I'm trying to change the amp from 230v to 240v

Why? The change should be well within tolerance.

+10% = 253v
-6% = c. 217v

The amp is set a 230v and just to clarify are you saying setting it at 230v is within tolerance ? I read comments the ideal is 240v and if the amp is set at 230 it can cause premature wear of components and tubes etc. I read ICBM comment on this so thought better safe than sorry.
I am not techy enough to know the science behind what are considered optimum operating conditions but I assume they do exist and when someone such as ICBM say's 240v is ideal.... I don't fancy any failures of any sort if they can be avoided

Danny1969 · January 2022

Some spade connectors look normal but actually have a little latching pin that needs to be squeezed before the spade connector will come off. I don't know what amp you are working on so don't know if it's the case for yours.

davros · January 2022

UK voltage from the mains should be 230 volts, doesn't that mean the setting is right?

Danny1969 · January 2022

davros said:

UK voltage from the mains should be 230 volts, doesn't that mean the setting is right?

240V ... so the amp set for 230 is running higher than it should be. A modern SMPS amp would self adjust for this but a valve amp with a linear transformer can't ....Everything will be a little less stressed if the amp is set for 240V

kipple · January 2022

Got the connectors off ..
Improvised and used a dental probe that I bent with pliers so it was right shape to do the Job
https://i.imgur.com/pewLN5r.jpg
https://i.imgur.com/qWwW7tU.jpg

kipple · January 2022

Danny1969 said:

davros said:

UK voltage from the mains should be 230 volts, doesn't that mean the setting is right?

240V ... so the amp set for 230 is running higher than it should be. A modern SMPS amp would self adjust for this but a valve amp with a linear transformer can't ....Everything will be a little less stressed if the amp is set for 240V

Thank you... there is no way the voltage in my house is ever 230v its normally a bit higher than 240v sometimes closer to 250v

ICBM · January 2022

Funkfingers said:

Why? The change should be well within tolerance.

+10% = 253v
-6% = c. 217v

Because the amp will run at its designed internal voltages and power dissipations, and put less stress on the components. While it will *tolerate* being run over voltage by that amount, especially in the short term, it's not ideal in the long run and could cause components to fail prematurely.

It's a worse problem with valve amps than any other type of equipment commonly used now, because they're almost unique in stepping *up* the incoming mains voltage, rather than down. (A valve amp typically operates at 400-500VDC.) The power dissipation of components is related to the square of the voltage, so makes more of a difference when the voltages are higher than when they're lower.

Some voltages are referenced to a fixed lower voltage which is independent of the supply, too - the usual example is low-voltage rails derived from higher ones using Zener diodes and resistors - often used for low-voltage supplies for channel switching, reverb etc. Because the lower voltage doesn't also rise, the power dissipation in the resistor then increases disproportionately.

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