Hi-Gain Amp Input Jack Shielding

[Cathode Ray]

I've seen this done on modded Marshalls, and the amp I'm building(kit) has it as well. It's often done very crudely, using scrap materials.

I can assume it's shielding, but what for ?

RF from inside the amp itself ?


Thanks in advance

[Roe]

yes, it is shielding and it works well. Fender even shields the speaker output jacks on newer amps

[SoulFetish]

yes, it is shielding and it works well. Fender even shields the speaker output jacks on newer amps

Are you talking about the thick insulating board they fit around the two speaker jacks? If you notice where the jacks are located in the chassis, often they are positioned near high voltage nodes and those are there to prevent anyone (children, etc.) from inadvertently sticking something in the speaker input and potentially shocking themselves.

[Roe]

that makes sense

[Reeltarded]

A better method of shielding is electrical tape with a foil layer encased in shrink wrap.

An even better method is none at all and the jack is installed right at the input grid of the first stage.



#rearinput #pokerintherear

[Cathode Ray]

A better method of shielding is electrical tape with a foil layer encased in shrink wrap.

An even better method is none at all and the jack is installed right at the input grid of the first stage.



#rearinput #pokerintherear

I know what shrink tubing is, and have some..

but can you tell me a source for the type of shrink wrap that will work for this little aluminum shield that's about 1-1/2" tall


Thanks.

[Reeltarded]

you wrap the jack in electrical tape, then foil with a ground wire, then a big shrink thing. The ground wire and the wire shield go to the input ground.. you use smaller shrink butted up to and over the larger stuff to cover the wire tail made at the junction of tye jack and wire.. it looks like a real rat tail.

[Cathode Ray]

you wrap the jack in electrical tape, then foil with a ground wire, then a big shrink thing. The ground wire and the wire shield go to the input ground.. you use smaller shrink butted up to and over the larger stuff to cover the wire tail made at the junction of tye jack and wire.. it looks like a real rat tail.

I can visualize it RT.

But what about the "shrink wrap".

Can you link a source for what you're talking about there

[Reeltarded]

At hardware stores I shop at they have it up to I think 3.25 inch (1.62 wide?) Electrical supply sites I have browsed also had thick and wide shrink.

[Cathode Ray]

At hardware stores I shop at they have it up to I think 3.25 inch (1.62 wide?) Electrical supply sites I have browsed also had thick and wide shrink.

Thanks RT.

I'll check it out.