Harman Kardon amp

Ilianh · 15th November 2002, 02:57 PM

i was given this amplifier (HK pm645 VXI) because it wasnt working, found out its the trasformer wich's thermal probe was blown, but i had to unwind the whole secondary coil to realise that. I took notes of how many turns, what wire and so on.... but im worried about one thing, i bought the same wire, and im about to wind it back,

what if the voltage isnt 100% exact as before? i couldnt find any specs on the net to see what its even supposed to be.....

and is this amplifier any good? its a 4 channel 60w per chan one i think, is it worth all the trouble?

i'll post pics eventualy

halojoy · 15th November 2002, 03:03 PM

you need not to worry
it doesn't need to be 100%
it will vary depending on watt output, anyhow
same number of wires will be closely enough

Ilianh · 20th November 2002, 04:50 AM

ok, well now i finished winding the new transformer, i tested it, and it works fine, theres a +\- 0.,5 volts difference between rails..

theres -70v|-50v|+50v|+70 for 4/8ohm

theres one small problem now.. becuz of the electromagnetic field and the ac voltage, the thing vibrates a little.. i hear some lil metalic plates vibrating.. and its somehow anoying.. what should i do? i tougt about heating some floor laquer to get it to about 40c so it gets very liquid.. and to put the transformer in it for 2-3 hours, then leave it to dry, is that a good idea?

___________
Mmmm beer

halojoy · 20th November 2002, 05:01 AM

there is some special siliconic? glue that is used to fix the windings in both transformers and aircoils in loudspeakers

there are expensive and less expensive
the type must be able to stand the heat that the transformer produce
but that is not so high

mrfeedback · 20th November 2002, 08:57 AM

"and to put the transformer in it for 2-3 hours, then leave it to dry, is that a good idea?"

Yup, that is fine, and then hang it on the clothes line for a week.
In my experience HK amplifiers run red hot (high bias current), so I usually back off the bias current - you won't notice sonic differences.
Also, they are very prone to dry/cracked solder joints, so my usual soloution is to blanket resolder the amplifier and power supply/regulator stages, and then you will have a long term reliable amp.

Eric.

PMik · 28th February 2005, 11:54 PM

http://manuals.harman.com/hk/Service...45VXI%20sm.pdf

usekgb · 1st March 2005, 12:33 AM

http://www.harmanservice.com/search/...mber=RPM645VXI

thbl · 3rd March 2005, 02:56 AM

That seams to be Harman's intranet, req. of user and pass.

-So that’s only for resellers

I’m looking for Service manuals for Citation XX and X-I

Can some one please help me.

I’m planning to build a clone off Citation 1.5 or maybe the older X-I.

May gees is that the XX model is an bridged X-I perhaps the manual can tell.

// Thomas

hzoli · 26th December 2005, 10:25 AM

Hi !

I have a HarmonKardon PM645 and I need a schematik for it

Can somebody help me ?

Thanx.

usekgb · 26th December 2005, 04:23 PM

Quote:

Originally posted by hzoli
Hi !

I have a HarmonKardon PM645 and I need a schematik for it

Can somebody help me ?

Thanx.

Here you go:
PM645 serivice manual

Cheers,
Zach

15th November 2002, 02:57 PM	#1
Ilianh diyAudio Member Join Date: Oct 2002 Location: Montreal, Canada	Harman Kardon amp i was given this amplifier (HK pm645 VXI) because it wasnt working, found out its the trasformer wich's thermal probe was blown, but i had to unwind the whole secondary coil to realise that. I took notes of how many turns, what wire and so on.... but im worried about one thing, i bought the same wire, and im about to wind it back, what if the voltage isnt 100% exact as before? i couldnt find any specs on the net to see what its even supposed to be..... and is this amplifier any good? its a 4 channel 60w per chan one i think, is it worth all the trouble? i'll post pics eventualy

28th February 2005, 11:54 PM	#6
PMik diyAudio Member Join Date: Mar 2004 Location: Fort Lauderdale, FL	http://manuals.harman.com/hk/Service...45VXI%20sm.pdf __________________ Mod is fun

1st March 2005, 12:33 AM	#7
usekgb diyAudio Member Join Date: Feb 2003 Location: Salt Lake City, UT, USA	http://www.harmanservice.com/search/...mber=RPM645VXI __________________ Ahhhhhhhhh...............That's what that button does.

3rd March 2005, 02:56 AM	#8
thbl diyAudio Member Join Date: Jan 2005 Location: Härnösand	Citation manual That seams to be Harman's intranet, req. of user and pass. -So that’s only for resellers I’m looking for Service manuals for Citation XX and X-I Can some one please help me. I’m planning to build a clone off Citation 1.5 or maybe the older X-I. May gees is that the XX model is an bridged X-I perhaps the manual can tell. // Thomas

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15th November 2002, 03:03 PM	#2
halojoy On Hiatus Join Date: Nov 2002	you need not to worry it doesn't need to be 100% it will vary depending on watt output, anyhow same number of wires will be closely enough

20th November 2002, 04:50 AM	#3
Ilianh diyAudio Member Join Date: Oct 2002 Location: Montreal, Canada	ok, well now i finished winding the new transformer, i tested it, and it works fine, theres a +\- 0.,5 volts difference between rails.. theres -70v\|-50v\|+50v\|+70 for 4/8ohm theres one small problem now.. becuz of the electromagnetic field and the ac voltage, the thing vibrates a little.. i hear some lil metalic plates vibrating.. and its somehow anoying.. what should i do? i tougt about heating some floor laquer to get it to about 40c so it gets very liquid.. and to put the transformer in it for 2-3 hours, then leave it to dry, is that a good idea? ___________ Mmmm beer

20th November 2002, 05:01 AM	#4
halojoy On Hiatus Join Date: Nov 2002	there is some special siliconic? glue that is used to fix the windings in both transformers and aircoils in loudspeakers there are expensive and less expensive the type must be able to stand the heat that the transformer produce but that is not so high

20th November 2002, 08:57 AM	#5
mrfeedback diyAudio Member Join Date: Feb 2002 Location: Perth, Australia.	"and to put the transformer in it for 2-3 hours, then leave it to dry, is that a good idea?" Yup, that is fine, and then hang it on the clothes line for a week. In my experience HK amplifiers run red hot (high bias current), so I usually back off the bias current - you won't notice sonic differences. Also, they are very prone to dry/cracked solder joints, so my usual soloution is to blanket resolder the amplifier and power supply/regulator stages, and then you will have a long term reliable amp. Eric.

26th December 2005, 10:25 AM	#9
hzoli diyAudio Member Join Date: Dec 2005 Location: Subotica	Hi ! I have a HarmonKardon PM645 and I need a schematik for it Can somebody help me ? Thanx.

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