Akai preamp, anyone know what these are?

woodturner-fran · 4th November 2010, 09:00 PM

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

ticknpop · 4th November 2010, 09:27 PM

they are likley relays - maybe reed relays

mlloyd1 · 4th November 2010, 09:36 PM

agreed - looks like relays to me, too.

mlloyd1

Zen Mod · 4th November 2010, 09:46 PM

reed relays certainly

woodturner-fran · 5th November 2010, 01:09 AM

Thanks guys,

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

Fran

Tekko · 5th November 2010, 01:11 AM

Seem to be part of the input switchery.

sakis · 09:14 AM

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

cliffforrest · 5th November 2010, 09:32 AM

Quote:

Originally Posted by woodturner-fran

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.

sreten · 5th November 2010, 09:37 AM

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 ?)

jacco vermeulen · 5th November 2010, 09:40 AM

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.

4th November 2010, 09:46 PM	#4
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	reed relays certainly __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

5th November 2010, 09:10 AM	#7
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	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 __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr Last edited by sakis; 5th November 2010 at 09:14 AM.

5th November 2010, 09:37 AM	#9
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	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 ?) __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

5th November 2010, 09:40 AM	#10
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	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. __________________ Not so much,.......if it says "ZM" in the corner.

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4th November 2010, 09:27 PM	#2
ticknpop diyAudio Member Join Date: May 2005 Location: toronto	they are likley relays - maybe reed relays

4th November 2010, 09:36 PM	#3
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	agreed - looks like relays to me, too. mlloyd1

5th November 2010, 01:09 AM	#5
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Thanks guys, Although I'm a bit mystified as to what they're used for - everything seems to be mechanically switched...... Fran

5th November 2010, 01:11 AM	#6
Tekko diyAudio Member Join Date: Jan 2005	Seem to be part of the input switchery.

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