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dmx2020 15th June 2006 01:08 AM

JVC AX440 Amp question
 
2 Attachment(s)
hello all,

I recently got hold of a JVC ax440 amplifier. And it looks to be about 15 years old or more.

I also have the user manual for it which states that it should have a power consumption of 190W. (240V 50Hz)

But on the back of the unit it says its 390W (240V 50Hz).

Since its quite a big difference i was wondering if anyone could help out on shedding some light on this issue.I searched on your forum but coudnt find any info on it.

Also if anyone has any info on these amps in general (sound quality etc) please share it as well.

Thanks.
Garry.

jethrobodinejr 19th April 2008 09:57 PM

Isn't this a JVC AX-44 not 440
 
Isn't this a JVC AX-44 not 440? I would like a copy of the users manual T\jethroATiquest.net put @ for AT.

For your question, I have a JVC AX-44 and it did a good job at high levels for years. Blew an output transister (I think) but I think that was bvecause I used a bad speaker that had deterioratred on it.


Anyone sho can help with the manual would appreciate it.

east electronics 20th April 2008 06:53 AM

in a few words
 
the power consumption that is stated in the rear of a comercial amlifier of that age and quality is to be calculated by 50% since the performance factor of class AB amps at the time is almost 50% or more optimistic 60% .

meaning that only 50% of consumed power is converted to audio .

then you have to divide this by the 2 channels existing in your amp and will give you the exact out of your amplifier rated @8 Ohms

50% of 390w is 195 w divided by 2 is 98 !!!! you got your shelf a wonderfull japanese amp of 2x100w solid power .

my opinion is to restore repair it, clean it and keep it and will service you problem free for morethan 20 years .

as about repair tips i compose these days a vintage repair/restore manual of course writen in plain Greek so everybody can read ha ha ha .....i ll let you know

jethrobodinejr 20th April 2008 07:44 PM

Power output of JVC AX 44 per manual that I found--do not need anymore
 
I found the manual for the JVC AX 44 (and do not really need it unless someone has a clean pdf which I could store on computer as my manual is not in great shape). Power output user manual of JVC AX 44 (not 440 as I am assuming the 0 is a typo) is 100 watts per channel min. RMS, both channels driven into 8 ohms from 20Hz to 20 kHz, with no more than 0.03% total harmonic distortion. (U.S.A. and Canada only). verbatim
user manual for JVC AX 44 says power consumption is USA 200 watts, Canada 340 watts, 435 VA, other areas 200 watts.
Backof two of these US says 200 watts

jethrobodinejr 20th April 2008 07:44 PM

JVC AX-44 or 440?
 
dmx2020 is this a 440 0r 44? What is stated power output in manual. What sakis posted does comport with what is stated for output power for JVC AX-44 JVC AX-44BK (I assume BK just means color) per manual. He is right this is a made in Japan. I purchased my first one that lasted 18 years (with I think a blown output transistor that might be my fault due to a deteriorated speaker) May 23, 1988 for $179 US (Think how much that would be in todays dollars or Euros.

I would also like to see saki's repair manual (if it is in English).

John Emerson 22nd July 2008 10:03 PM

Has a service manual been unearthed?
 
Sure could use a service manual - or at least the schematic. The op-amp at the input has turned brown and let its smoke out, and some of the resistors around it are unidentifiable. DC at the outputs, of course, although they seem OK.
- - - John

leadbelly 22nd July 2008 10:11 PM

I have an AX-44 which I bought new and still use. I modded it a few years back; bypassed the preamp board completely. Might be a good option for you.

jrmont 2nd January 2010 04:28 PM

I have AX-44BK Service Manual
 
I have a Service manual for an AX-44BK, but unfortunately misplaced the schematic. The manual is quit lengthy with loose pull-out pages. I cannot copy for you, but I would be glad to help identify parts or procedures.


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