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...

Re: Barcus-Berry Standard Preamp Model 1330 (OPAMP VERSION)

Postby Manfred » 06 Jan 2020, 21:01

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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Re: Barcus-Berry Standard Preamp Model 1330 (OPAMP VERSION)

Postby soulsonic » 06 Jan 2020, 21:11

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:
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Re: Barcus-Berry Standard Preamp Model 1330 (OPAMP VERSION)

Postby Manfred » 07 Jan 2020, 20:37

One more Question.
What is the pin spacing of the potentiometers?
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Re: Barcus-Berry Standard Preamp Model 1330 (OPAMP VERSION)

Postby Manfred » 08 Jan 2020, 00:02

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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Re: Barcus-Berry Standard Preamp Model 1330 (OPAMP VERSION)

Postby soulsonic » 08 Jan 2020, 00:53

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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Re: Barcus-Berry Standard Preamp Model 1330 (OPAMP VERSION)

Postby Manfred » 08 Jan 2020, 02:47

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

BarcusBerryStdPreAmpModel1330_SolderSide.pdf


SprintLayout 6.0 File:
BarcusBerryStdPreAmpModel1330.zip
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