Yamaha RA-70R Amplifier

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neeeek
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Yamaha RA-70R Amplifier

Unread post by neeeek » Sat Apr 14, 2012 3:29 pm

Helloooo!

I'm new here and wasn't quite sure where to put this.. sorry if it's in the wrong part of forum..

I've spotted a Yamaha RA-70R Amplifier on ebay that i'm thinking of buying but i have no idea how much it's worth? I've tried searching for information regarding the amp but apart from a few old threads / posts briefly mentioning it, wikipedia listing it and the keyboard player from Yes playing it.. I can't find anything??

I'm new to the whole music game so don't know if judging it's value by RA-50 / 70s selling prices will be anything to go by but if so it should be worth about £100?

But then i'm thinking, because there's such little information about this particular model that it could be extremely rare and worth alot more? Or maybe i'm being stupid and the AR-70R is the same as an AR-70?

All information will be greatly appreciated.. I'm highest bidder so far but don't know what a fair price to pay is..



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Fozzer
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Re: Yamaha RA-70R Amplifier

Unread post by Fozzer » Sat Apr 14, 2012 4:23 pm

..is it similar to this?...>>>

http://www.youtube.com/watch?v=3QVDIoOtSzU

One 2-speed rotating speaker, and a one fixed speaker.
It merely creates a simple modulating effect.


Note that it is nothing like a Leslie unit, which contains 2 speakers.
One fixed 15" Bass speaker with a 2-speed rotating drum.
One fixed 2" Treble speaker with a 2-speed rotating horn.

The rotating units will rotate at slightly different speeds, creating a unique doppler effect.

I suspect that one of the small, "Leslie speaker effect Modules" available, would produce a more realistic effect, to mimic a real Leslie Speaker cabinet!

http://www.youtube.com/watch?v=pIfCwo3aD-0

Paul...with a 760 Leslie... 8) ...!


Yamaha MO6, MM6,DX7,DX11,DX21,DX100,MK100,EMT 10,PSR 400,PSS 780,Roland GW-8L v2,Roland TR 505,Casio MT-205, Korg CX-3v2 dual manual (Hammond B3 clone) + Leslie 760/770,M-Audio Pro-keys 88, Key Rig,Cubase,Keyfax4.Various Guitars.Orchestral,Baroque,Renaissance,Medieval Instruments.....and a Petrol Lawn Mower...
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neeeek
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Re: Yamaha RA-70R Amplifier

Unread post by neeeek » Sat Apr 14, 2012 5:22 pm

To be honest I have no idea wether or not it's like that.. The only information from the seller is "THIS AMP IS 160 WATTS AND HAS THE USUALL CONTROLS - VOLUME, BASS, TREBLE ALSO WITH TREMELO AND REVERB" and bits of info on the 50 and 70 models.. Is the 70R better that the 50? Better than the 70? Lack of info is frustrating :/

Thanks for the reply ;)



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Fozzer
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Re: Yamaha RA-70R Amplifier

Unread post by Fozzer » Sat Apr 14, 2012 5:38 pm

neeeek wrote:To be honest I have no idea wether or not it's like that.. The only information from the seller is "THIS AMP IS 160 WATTS AND HAS THE USUALL CONTROLS - VOLUME, BASS, TREBLE ALSO WITH TREMELO AND REVERB" and bits of info on the 50 and 70 models.. Is the 70R better that the 50? Better than the 70? Lack of info is frustrating :/

Thanks for the reply ;)
It sounds a bit dangerous, and expensive?, to jump into E-Bay looking for an "amplifier" that you know nothing about!

I would think that you really need to know, and fully understand, the exact specification of exactly what you are looking for, and to what purpose is it going to be used for.

There are so many Amplifiers around for different purposes, all at different prices, and specifications.

..in other words...A Minefield!

Paul.... :wink: ...!


Yamaha MO6, MM6,DX7,DX11,DX21,DX100,MK100,EMT 10,PSR 400,PSS 780,Roland GW-8L v2,Roland TR 505,Casio MT-205, Korg CX-3v2 dual manual (Hammond B3 clone) + Leslie 760/770,M-Audio Pro-keys 88, Key Rig,Cubase,Keyfax4.Various Guitars.Orchestral,Baroque,Renaissance,Medieval Instruments.....and a Petrol Lawn Mower...
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Buzzard
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Re: Yamaha RA-70R Amplifier

Unread post by Buzzard » Thu Oct 03, 2013 6:37 pm

I've got one !!

Typical and VERY COOL example of japanese over engineering !!

Ordinary Leslie speakers use rotating drum for bass and rotating horn for treble speaker,
but the speakers are firmly fixed in the cabinet.

Yamaha have a fixed bass/midrange speaker without the rotor drum,
and a midrange/treble speaker that rotates.
This solution requires a counterweight to balance the rotating rectangular polystyrene speaker.
It has ball bearings, and motor coals like on an electric motor, to power the speaker.

It was made as an organ amp, and that's why the controls are located on the rear,
so that the organ player can control the amp facing the audience.

Tech info:
70 watt transistor amp.
Yamaha JA-3852 , 1 x 15" round cone speaker, 70 watt , 8 ohms
Yamaha JA-1701B , rectangular polystyrene speaker , 8 ohms ,
used in rotor unit powered by Electric motor for rotation.
real old school spring reverb unit.

controls for : hi/lo inputs , volume , bass , treble , reverb , remote jack , tremolo (rotor) speed ,
fuses , power indicator , on/off switch.

VERY cool for guitars too !!

2 switch remote footswitch for "normal" sound or rotor sound.
The second switch changes from "idle speed" to the maximum speed set on the Tremolo control.

the Yamaha "Leslies" :
RA-50
RA-70r
RA-100
RA-200(r) this type of amp was used by David Gilmour

Theese are vintage amps, so try them out before buying if possible.
They usually sell fairly cheap.
The Yamaha TA series are also great if you stumble over one.

Best Regards
Peter


Yamaholic, Guitars, Amps and Bikes. :idea: My Guitars: http://www.yamahamusicians.com/forum/vi ... =24&t=7004 :idea:

scottoto
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Re: Yamaha RA-70R Amplifier

Unread post by scottoto » Tue Dec 17, 2013 10:51 pm

I've just bought a Yamaha RA-50...very impressed with it. Apart from the pretty extreme weight, and it being somewhat larger than I'd imagined (about 3 foot tall, pushing 30 kilos)!
Fozzer wrote:..is it similar to this?...>>>

http://www.youtube.com/watch?v=3QVDIoOtSzU

One 2-speed rotating speaker, and a one fixed speaker.
It merely creates a simple modulating effect.

Have to say that ^ isn't a great representation of what these can do. In my opinion it achieves a damn near close enough approximation of the leslie/chorusing effect, with the bonus of course being that it's an amp, not just a speaker, so guitars/vocals/anything can be plugged straight into it.

Here's a better demo.

http://www.youtube.com/watch?v=jRRH234gYiM



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Buzzard
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Re: Yamaha RA-70R Amplifier

Unread post by Buzzard » Thu Dec 19, 2013 6:40 pm

scottoto wrote:I've just bought a Yamaha RA-50...very impressed with it. Apart from the pretty extreme weight, and it being somewhat larger than I'd imagined (about 3 foot tall, pushing 30 kilos)!
Fozzer wrote:..is it similar to this?...>>>

http://www.youtube.com/watch?v=3QVDIoOtSzU

One 2-speed rotating speaker, and a one fixed speaker.
It merely creates a simple modulating effect.

Have to say that ^ isn't a great representation of what these can do. In my opinion it achieves a damn near close enough approximation of the leslie/chorusing effect, with the bonus of course being that it's an amp, not just a speaker, so guitars/vocals/anything can be plugged straight into it.

Here's a better demo.

http://www.youtube.com/watch?v=jRRH234gYiM
I use Yamaha RA amps for guitar and it's the heaviest type of chorus pedal you can get, but the sound is just so much better.
The rotation speed is a bit slower than the horns on a Leslie, but for guitars plenty fast to get that swirly sound.

Best Regards
Peter


Yamaholic, Guitars, Amps and Bikes. :idea: My Guitars: http://www.yamahamusicians.com/forum/vi ... =24&t=7004 :idea:

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Buzzard
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Re: Yamaha RA-70R Amplifier

Unread post by Buzzard » Mon Jun 05, 2017 11:43 pm

pdf manuals for RA and TA amps here: :idea: http://www.yamahamusicians.com/forum/vi ... =24&t=7006 :idea:


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