(Topic ID: 272200)

Stern v.1 audio potentiometer

By Caucasian2Step

3 years ago


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  • 13 posts
  • 6 Pinsiders participating
  • Latest reply 2 years ago by seshpilot
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#2 3 years ago
Quoted from Caucasian2Step:

What is the rating on a potentiometer for a Stern made in 1980.

From memory the potentiometers are 25k ohms logarithmic.

Speakers are 8 ohms.

#4 3 years ago
Quoted from KenLayton:

This Jameco Electronics # 140514 will work fine:

Ken, that's for Bally. They use the pot directly on the amplifier output to the speaker - hence the low ohms and high wattage.

Stern is different - their sound boards have a MC3340 volume attenuator chip with the 25k ohm pot in the cabinet connected to it. No audio is carried on the cabling to the pot hence there's no noise picked up via the cabinet cabling.

#6 3 years ago
Quoted from KenLayton:

I just noticed in a Meteor schematic, Stern does NOT even mention a value of the pot. It just says external pot.

No worries, check the Hot Hand schematics for the SB100 sound board - there it's mentioned as 25k ohms. The SB300 sound board uses the same volume attenuator chip.

About 6 months ago I measured the pot on a Catacomb (uses a SB300 sound board) and it was a standard 500mW logarithmic 25k ohm pot.

6 months later
#9 3 years ago
Quoted from Madmax541:

Need to replace volume control potentiometer 25k assuming 5watts rated.
Would be using as replacement for Hot Hand & Seawitch

Presume that's a typo, but Stern only requires 0.25 watt potentiometers.

Quoted from Madmax541:

Not sure what tapered wire wound means on performance

Wirewound potentiometers are how they are constructed to be higher power. Lower power potentiometers use carbon.
That potentiometer is labeled as "linear taper" which is contradictory. Either it's linear, or its tapered. Audio equipment volume controls are logarithmic, but in a set once and forget scenario like this it's not going to matter too much if it's linear.

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