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Old 4th November 2010, 09:00 PM   #1
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Default Akai preamp, anyone know what these are?

Hi all,

I recently picked up an Akai preamp. Lovely thing with a nice build quality. Sounds pretty OK too. Anyway, I had the cover off (as you do!!) and was wondering what the hitachi devices in the middle of the board were.

See the ones, marked L23, green and with the hitachi logo. Couldn't find anything on a search for them.

Anyone recognise them?

Its an Akai PR-A06 - don't suppose theres a service manual knocking about (again, search only showed pay sites)

Fran
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Old 4th November 2010, 09:27 PM   #2
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they are likley relays - maybe reed relays
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Old 4th November 2010, 09:36 PM   #3
mlloyd1 is offline mlloyd1  United States
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agreed - looks like relays to me, too.

mlloyd1
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Old 4th November 2010, 09:46 PM   #4
Zen Mod is offline Zen Mod  Serbia
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reed relays certainly
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Old 5th November 2010, 01:09 AM   #5
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Thanks guys,


Although I'm a bit mystified as to what they're used for - everything seems to be mechanically switched......


Fran
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Old 5th November 2010, 01:11 AM   #6
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Seem to be part of the input switchery.
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Old 5th November 2010, 09:10 AM   #7
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i wonder how possible is that this machine "sounds nice " when its obvious with a naked eye that has more than one capacitor on the power supply boiled to deep fried

presumambly most of other capacitors inside will have more or less same or similar problems ....

often we see and read coments that machine A or machine plays fantastic or amazing and bla bla bla .... that could be truth if compaired to a the previous system that was an ipod with creative speakers ....or something like that ...

back to earth ....for a machine that is builted like that and electric wise most if not all caps have to be replaced ....given the oportunity better quality and more capacitance will make things by far better in a lot of stages .....

benefit from the relays and lighten up wiring and may also play with bandwidth and or other capacitor based limitations and this machine could easily reach hiend standards ...

not a lot of money but for sure a lot of expert work to be done to get there

kind regards Sakis
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Last edited by east electronics; 5th November 2010 at 09:14 AM.
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Old 5th November 2010, 09:32 AM   #8
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Quote:
Originally Posted by woodturner-fran View Post
Thanks guys,


Although I'm a bit mystified as to what they're used for - everything seems to be mechanically switched......


Fran
Look at the pcb tracks to the north of the relays - they go straight to the chassis input sockets!

Much easier and shorter path lengths to switch the relay coils (DC) via the fron panel switches.
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Old 5th November 2010, 09:37 AM   #9
sreten is offline sreten  United Kingdom
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Hi,

Perhaps the switches switch the relays, not the signal directly,
that would make all the wiring looms more innocuous.
What is that big black lump at the front ?
No luck with the manual at hifiengine.

rgds, sreten.

(Front panel layout ?)
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Old 5th November 2010, 09:40 AM   #10
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Oh, look how pretty the bonbons are.
They also have beautifull letters and numbers printed above them.
I like these in particular : RL2 , RL4 , RL7.

Mm, I wonder what that white belt is for.
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