ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
greetings all,
i am looking for a spare balance potentiometer for my BM4400
has anyone a spare one to offer ?
thank you
ALF
Serialnumber?
Martin
Type 2417,
serial # 1384024
thanks
Sorry, I don't have one.Is it broken?
alf
is this the issue you have been having all the time?
Martin,
i am getting confusing measurements when checking its resistance?!
breaking it open wont achieve much if the tracks are worn.
your thoughts ?
Craig,
yes, it is related.
can you supply one ?
Alf
I have a couple of linear pots on a BM4000 amp that I have used for spares, they are 20k ohm which is the same value as those fitted to the 4400, I will have a look to see if they are physically compatible....if so you can have one.
Craig
Looks like all spare parts cabinets are locked ?ðĪðģ
the balance pot definitely has a problem, unable to varify the 20k resistance
nor any significant resistance changes when slider is moved.
Thanks Craig,
though I have my doubts they would be compatible ?
It looks as their connection tabs are different to the BM4400 but there is no harm in trying.
Can imagine Martin would have had one and was asking for the serial #.......no luck
Two types of potentiometers was used in Beomaster 4400.Both types are unique to Beomaster 4400.The change took in place during production from serialnumber 1524001.I have a potentiometer of the "wrong" type, that unfortunately won't fit in your Beomaster.This one: https://beoparts.com/2014/07/13/beomaster-4400-treble-bass-potentiometer-2/
These balance potentiometers are not just two resistive tracks in antiparallel.They are quite special creatures where the two tracks each have a zero-ohm track halfway down the length, starting from each their end anda resistive track for the rest of the length.Both tracks have zero resistance at the center.
Thanks for the info Martin,
just unfortunate for my BM that you only have the newer version at hand......
please let me know if you get one in ðð
Thats very interesting, if a little confusing I dont suppose you could provide a little schematic of the workings just out of interest?
ALF: Looks like all spare parts cabinets are locked ?ðĪðģ the balance pot definitely has a problem, unable to varify the 20k resistance nor any significant resistance changes when slider is moved. ALF
Are you sure, you are measuring it correctly?For the left channel, the resistance is zero all the way moving the slider from left side to center position, and from center position it varies towards 20K as you near the right side (lowering left channel signal). Right channel vice versa.In other words, the tracks are constant zero ohms for 50% of the travel distance and only varies in resistance the last half.Each of the two channels only has a potentiometer function from center outwards towards each their end. The remaining of the travel it's at zero ohms.At the center position both channels should be at zero ohms (no damping).
It's not like the other potentiometers and if you are not familiar with its type, it can indeed give "confused readings".
thanks for the “pot inside view” but no matter how I measure, there was no 20KOhm to be seen .....?!
I never bet my life away garanteeing no mistakes - i will check again as a valued forum member suggested
to check work three times ðĪŠ
there is still the possibility of operating a faulty balance pot ?!!?
martin,
I can most certainly not replicate any of these suggested measurments.
My only conlusion is a dodgy balance potentiometer, hence the search for a replacement ð
Hi everyone,
case closed - found a working balance pot !!
yes, it is the correct one ðð