Barcus-Berry Standard Preamp Model 1330 (OPAMP VERSION)

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
Manfred
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Post by Manfred »

roseblood11 wrote:Is there really no better solution than using transformers as inductors?
4700uH inductors are avaliable on ebay.
Now what is correct, 4.7H, 500mH transformer, 4700uH = 4.7mH? :?

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soulsonic
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Post by soulsonic »

Manfred wrote:
roseblood11 wrote:Is there really no better solution than using transformers as inductors?
4700uH inductors are avaliable on ebay.
Now what is correct, 4.7H, 500mH transformer, 4700uH = 4.7mH? :?
! ! ! ! Good catch! :lol:
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran

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Post by Manfred »

One more Question.
What is the pin spacing of the potentiometers?

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Post by Manfred »

Hi Soulsonic,

to create this layout i made a template from the photos and had the problem that when the opamp pinout was right the pads for the potentiometers had a distance of 1/4".
Is this true or is the real distance 1/5", if necessary I will adjust the layout.
3130 Layout.JPG

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soulsonic
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Post by soulsonic »

The spacing I measured is 1/4". The original pots are the larger size CTS branded ones, like one usually sees in older guitars and amps. I believe they are approximately 1" diameter.
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Post by Manfred »

soulsonic wrote:The spacing I measured is 1/4". The original pots are the larger size CTS branded ones, like one usually sees in older guitars and amps. I believe they are approximately 1" diameter.
Thanks!

Ready to print PDF-files:
BarcusBerryStdPreAmpModel1330_ComponentSide.pdf
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BarcusBerryStdPreAmpModel1330_SolderSide.pdf
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SprintLayout 6.0 File:
BarcusBerryStdPreAmpModel1330.zip
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