Maestro - FRB-1 Full Range Boost

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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RLBJR65
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Post by RLBJR65 »

Sometimes I troll Ebay for odd old stuff. Never seen this one before.

https://cgi.ebay.com/Maestro-FRB-1-Full- ... dZViewItem
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Maestro Full Range Boost FRB1
Maestro Full Range Boost FRB1
Last edited by modman on 27 Jul 2012, 16:47, edited 3 times in total.
Reason: uploaded a picture - orignal link dead

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soulsonic
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Post by soulsonic »

That thing looks really cool - and the apparent scarceness and value of the original makes it a perfect candidate for DIY copying. I would really like to see a schematic for it.

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The Rotagilla
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Post by The Rotagilla »

soulsonic wrote:I would really like to see a schematic for it.
I'm on it. Might need a few days.

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Post by analogguru »

So you are looking for this ?

Maestro Full Range Booster (FRB-1) schematic

18V without additional electronics and for this reason less power consumption.

Hey, that´s something for bajaman....:
Frequency selective distortion from the 70´s..... another time - back to the future: Maybe the first Klon-Clone... :roll:
Attention: Maestro - B*hringer of the 70´s - is trying to harm Bill Finnegans income :!: :wink:

enjoy,
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Last edited by analogguru on 30 Aug 2007, 09:04, edited 2 times in total.
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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Post by soulsonic »

Danke!

I noticed the two battery snaps in the picture. Hmm... I'll have to try this one out. I've got some 2N5088 and 741 gathering dust.....

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Post by soulsonic »

Huh? "Power Boost" is all four filters on at once... that's funny!

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Post by bajaman »

an early KLON :lol: :lol: :lol:
bajaman

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Post by RLBJR65 »

Thanks, AG!

Did you have that posted somewhere else at one time? I could have sworn that I had seen a schem for it before but couldn't find any references.

Replacing R20, R22, R24 and R26 with pots would make the frequencies adjustable?

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Post by markm »

bajaman wrote:an early KLON :lol: :lol: :lol:
bajaman
:lol:
Join together with the "Banned"!

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Post by The Rotagilla »

I attempted to make my first contribution but Analogguru beat me to it. I did compare the Analogguru schematic to the factory one and they match 100%. Should anyone want the factory schematic shoot me a PM.

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Post by bajaman »

you gotta be quick to beat AG :lol: :wink:
bajaman

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Post by The Rotagilla »

bajaman wrote:you gotta be quick to beat AG :lol: :wink:
bajaman
The intent was there. Do I get credit for that? :lol:

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Post by bajaman »

close - but no cigar :lol:

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Post by The Rotagilla »

bajaman wrote:close - but no cigar :lol:
Damn! Always a bridesmaid, never a bride. [smilie=a_cry.gif]

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Post by analogguru »

guts:

https://cgi.ebay.com/Vintage-1972-Maestr ... 0028000109

Note the bottom-plate with the wrong schematic of an octave-box.

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Post by frank.clarke »

You could have opamp clipper for each frequency without a lot of extra trouble, that would be a step up from a Klon.

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Post by briggs »

I already made a tubescreamer style design that does exactly that. It was sold at one point too :) I'll be getting the go ahead to post the design/schematic soon 8)
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Post by mirosol »

The link's dead, so here's AG's schem..
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Maestro_FRB-1.gif
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
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