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Old 3rd March 2009, 02:51 PM   #1
WRyan is offline WRyan  United States
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Default External Test Points

Hello,

I would like to install external bias test points on my amp. I am curious to know what these kind of connectors are called.

Click the image to open in full size.

Also, does anyone have a suggestion concerning what kind of externally accessible pot I can use for bias adjustment? I have heard of thumb screw style pots... never seen them though.

Any suggestions would be greatly appreciated!

Thanks Everyone!!
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Old 3rd March 2009, 03:33 PM   #2
Trout is offline Trout  United States
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Default Re: External Test Points

Quote:
Originally posted by WRyan
Hello,

I would like to install external bias test points on my amp. I am curious to know what these kind of connectors are called.

Click the image to open in full size.

Also, does anyone have a suggestion concerning what kind of externally accessible pot I can use for bias adjustment? I have heard of thumb screw style pots... never seen them though.

Any suggestions would be greatly appreciated!

Thanks Everyone!!
How about this, The exact mouser part numbers,

Electronic Hardware TIP JACK BLACK
Mouser Part #: 530-105-0803-1

Electronic Hardware TIP JACK RED
Mouser Part #: 530-105-0802-1

As far as the pot used, I always use The Fender Style 10K pot in most of my amps.
Click the image to open in full size.

You can get them at AES
Antique Electronic Supply
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Old 3rd March 2009, 03:41 PM   #3
WRyan is offline WRyan  United States
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Thank you very much!!
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Old 3rd March 2009, 05:42 PM   #4
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they're also called 'banana' plugs, they're 4mm. make sure you buy fully insulated ones
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Old 3rd March 2009, 06:26 PM   #5
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You can also get panel mount "tip" jacks from Digikey, Mouser, etc. That are smaller than banana jacks; they are for the tips of multimeter probes.

Panel mount pots are also available with a screwdriver slot in a flush-mounted shaft for this application.
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Old 3rd March 2009, 07:57 PM   #6
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exposed 'tips' are not a good idea if it's anything above 48V (say a bias point for an 845). 4mm banana jacks are what's commonly used for multimeters
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Old 3rd March 2009, 09:53 PM   #7
Trout is offline Trout  United States
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Quote:
Originally posted by makeb4break
exposed 'tips' are not a good idea if it's anything above 48V (say a bias point for an 845). 4mm banana jacks are what's commonly used for multimeters

Most of the multimeters " Probes " fit the tip jacks in the pictures above.
The tip jacks from mouser (part number above) are pretty much the standard for bias test points on guitar amps these days.
There must be over a hundred of amplifier builders that use those exact parts.

The actual contact is well inside of the plastic mounting sleeve.
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Old 3rd March 2009, 10:02 PM   #8
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yes, we agree

i was just making a point about exposed banana plugs as they come in many different shapes, some not suitable for this purpose
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