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"Roland Blues Cube" schematic wanted...

Started by stratitis, April 25, 2020, 02:15:52 PM

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stratitis

Can somebody help me finding "Roland Blues Cube Hot" schematic?

(PS: Sorry for the confusion and my extensive editing my postings. I did not know the "Hot" is a DSP modeling amp, I'm looking for the old all-analog - non-DSP version)

joecool85

Quote from: stratitis on April 25, 2020, 02:15:52 PM
Can somebody help me finding "Roland Blues Cube Hot" schematic?

I'm thinking it unlikely you'll find this schematic, I've not seen it, that's for sure.  Are you repairing one, or looking to make a clone?
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

stratitis

#2
I want to analyze the schematics to understand the Roland "Tube Logic" technology.
I randomly found an used equipment offer of that amp (i never heard of it before) but the reviews I found were not too bad...
https://www.soundonsound.com/reviews/roland-blues-cube-hot-british-el84-modified
https://translate.google.de/translate?hl=de&tab=wT&sl=auto&tl=en&u=https%3A%2F%2Fwww.bonedo.de%2Fartikel%2Feinzelansicht%2Froland-blues-cube-hot-test.html

Jazz P Bass

"Tube Logic – a marriage of solid-state analog technology and DSP"

Not too sure how the schematic will reveal the true nature.

joecool85

Quote from: Jazz P Bass on April 27, 2020, 07:42:45 PM
"Tube Logic – a marriage of solid-state analog technology and DSP"

Not too sure how the schematic will reveal the true nature.

Sounds like they're running an analog opamp into a DSP circuit lol.
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

stratitis

#5
Obviously there are DSP (about 2014) and non-DSP versions (about 1996)

I'm interested in the non-DSP.
(user manual BC-30: https://static.roland.com/assets/media/pdf/BC-30_30-210_OM.pdf )

"This Vox-inspired special edition of Roland's analogue modelling amp is equally impressive at home, on stage or in the studio." [edit: this is a DSP version] ( https://www.soundonsound.com/reviews/roland-blues-cube-hot-british-el84-modified ).

That's what I've found:
https://www.vguitarforums.com/smf/index.php?topic=11865.0
There's a schematic of the Blues Cube 30 (no DSP, no reverb, no USB, no power control switch):


Better quality service manual (including schematics):
http://www.synfo.nl/servicemanuals/Roland/BC-30_BC-60_SERVICE_NOTES.pdf

Power amplifier uPC1188H:

http://www.electronica.ro/audio/uPC1188H.shtml
https://translate.google.com/translate?hl=de&sl=ru&tl=en&u=http%3A%2F%2Fradiostorage.net%2F3404-mikroskhema-upc1188h-usilitel-nizkoj-chastoty-18watt-pri-22v.html

Q1,2,8,9,10,11 (amplifier stages):
2SK184, N channel J-FET
https://alltransistors.com/pdfdatasheet_toshiba/2sk184.pdf

Q3,6,7,13,14, 19(?) (signal switches, tone stack output impedance converter):
2SK246, N channel J-FET
https://alltransistors.com/pdfdatasheet_toshiba/2sk246.pdf

Q15,16 (tone stack driver):
2SK363, N channel J-FET
https://alltransistors.com/pdfdatasheet_toshiba/2sk363.pdf