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3rd March 2009, 02:51 PM
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#1 |
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diyAudio Member
Join Date: Jan 2009
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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.  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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3rd March 2009, 03:33 PM
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#2 | |
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diyAudio Member
Join Date: Nov 2004
Location: Midwest Madman
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Re: External Test Points
Quote:
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.  You can get them at AES Antique Electronic Supply |
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3rd March 2009, 05:42 PM
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#4 |
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diyAudio Member
Join Date: Jan 2009
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they're also called 'banana' plugs, they're 4mm. make sure you buy fully insulated ones
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3rd March 2009, 06:26 PM
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#5 |
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diyAudio Member
Join Date: Jan 2008
Location: So.Cal.
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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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3rd March 2009, 07:57 PM
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#6 |
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diyAudio Member
Join Date: Jan 2009
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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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3rd March 2009, 09:53 PM
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#7 | |
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diyAudio Member
Join Date: Nov 2004
Location: Midwest Madman
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Quote:
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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3rd March 2009, 10:02 PM
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#8 |
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diyAudio Member
Join Date: Jan 2009
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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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