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Old 15th November 2002, 02:57 PM   #1
Ilianh is offline Ilianh  Canada
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Default 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
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Old 15th November 2002, 03:03 PM   #2
halojoy is offline halojoy  Sweden
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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
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Old 20th November 2002, 04:50 AM   #3
Ilianh is offline Ilianh  Canada
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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?




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Old 20th November 2002, 05:01 AM   #4
halojoy is offline halojoy  Sweden
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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
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Old 20th November 2002, 08:57 AM   #5
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"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.
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Old 28th February 2005, 11:54 PM   #6
PMik is offline PMik  United States
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http://manuals.harman.com/hk/Service...45VXI%20sm.pdf
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Old 1st March 2005, 12:33 AM   #7
usekgb is offline usekgb  United States
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http://www.harmanservice.com/search/...mber=RPM645VXI
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Old 3rd March 2005, 02:56 AM   #8
thbl is offline thbl  Sweden
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Default 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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Old 26th December 2005, 10:25 AM   #9
hzoli is offline hzoli  Yugoslavia
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Hi !

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

Can somebody help me ?

Thanx.
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Old 26th December 2005, 04:23 PM   #10
usekgb is offline usekgb  United States
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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
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