Roland - AF-60 BeeGee Fuzz Sustainer  [schematic]

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Sickle
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Post by Sickle »

Not sure what year this booger came from, but here ya go, my precious Bee Gee laid bare. Always thought the Toshiba silver hat IC was pretty cool.

:mrgreen: :mrgreen: :mrgreen:
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Roland - AF-60  ( Bee Gee ) gutshot
Roland - AF-60 ( Bee Gee ) gutshot
Roland - AF-60  ( Bee Gee ) gutshot
Roland - AF-60 ( Bee Gee ) gutshot
Roland - AF-60  ( Bee Gee ) gutshot
Roland - AF-60 ( Bee Gee ) gutshot
Roland - AF-60  ( Bee Gee ) gutshot
Roland - AF-60 ( Bee Gee ) gutshot
Roland - AF-60  ( Bee Gee ) gutshot
Roland - AF-60 ( Bee Gee ) gutshot
Roland - AF-60  ( Bee Gee ) gutshot
Roland - AF-60 ( Bee Gee ) gutshot
Roland - AF-60  ( Bee Gee ) gutshot
Roland - AF-60 ( Bee Gee ) gutshot

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Bernardduur
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Post by Bernardduur »

Roland - AF-60  ( Bee Gee ) schematic
Roland - AF-60 ( Bee Gee ) schematic
Schematic

How's the sound? Are those silicon diodes?
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analogguru
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Post by analogguru »

The resistor from the volume pot to gnd isn´t 47 Ohm, it is 470 Ohm. And one capacitor 10µF from V+ to ground isn´t drawn in the schematic.

BTW, the "beautiful TA7504M" has been "cannibalized" by the guys at Roland. Normally this chip has 8 pins. in the factory they cut two legs (pin 1 and 5) for easier assembly - have a look at the underside of the chip. From the chip architecture it is very similar (and compatible) to a 741.

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gnognofasciani
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Post by gnognofasciani »

Great pics, thank you! :applause:
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Sickle
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Post by Sickle »

Bernardduur wrote:How's the sound? Are those silicon diodes?
I personally dig the sound a lot. I think it gets overlooked frequently in favor of the Double Beat and Bee Baa.

Not sure if the diodes are silicon or germanium.

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analogguru
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Post by analogguru »

Not sure if the diodes are silicon or germanium.
They are silicon.

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Sickle
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Post by Sickle »

Makes sense as virtually everything that came out of Japan by that point was silicon-based. Question, AG: Would swapping out the silicons for germaniums require any tuning to the rest of the circuit or would it be a straight affair?

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analogguru
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Post by analogguru »

Sickle wrote:Makes sense as virtually everything that came out of Japan by that point was silicon-based. Question, AG: Would swapping out the silicons for germaniums require any tuning to the rest of the circuit or would it be a straight affair?
:shock: :shock: :shock:
Better if you mod an Colorsound Tonebender reissue - similar circuit.

But if you really want to change the diodes then I would change the output capacitor from 47n to 100n and shorten the 47k between the cap and the volume poti. This will give you nearly the same max. output level. The reason is that germanium diodes will have less signal.

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yeeshkul
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Post by yeeshkul »

analogguru wrote:And one capacitor 10µF from V+ to ground isn´t drawn in the schematic. analogguru
Hello analogguru, i can see a 10uF cap to the ground via 15k and 470k resistor - did you overlooked this one or you mean another 10uF filtering cap?

also ... guys does anyone have a datasheet for TA7504M please?

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modman
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Post by modman »

more gutshots
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