My X600 hum for a while

[ljames]

Wow, never know there is a a section for Pass Labs alone! Great.

I have a pair of X600 for several year now, yeah, the oldest one I guess, make great sound driving my old trustful B&W 802.

However, it always has one problem in one of X600 blocks. It hums for like 20-30 minutes when I turn it on, the other one is fine, no any noise. The hum coming from the unit, not from speaker, not sure where it comes from. (transformer is suspected though) It will become completely silent after that period, seems warming up has fixed or stabilized something. Any idea how I may fix this?

[sakellogg]

cant fix it, sorry. gunna have to send it to zen mod for proper disposal.

im kidding.
have you tried it with nothing hooked up to it?
like just the amp to speakers.

[Zen Mod]

Originally Posted by sakellogg

cant fix it, sorry. gunna have to send it to zen mod for proper disposal.

im kidding.
have you tried it with nothing hooked up to it?
like just the amp to speakers.

no kidding in that idea - it's completely sane



good advice - disconnecting speakers and source ( preamp)

if humming is still there - it's certainly xformer

if humming amp share same mains outlet with non-humming amp , influence of DC in mains can be discarded ... so - only cure is to replace mains xformer

b'cause monoblocks are in case , replacing xformers ( by orig. specs) in both is probably more practical than chasing original one for just one amp .

or - removing hummster from amp , de-nuding it and give him a bath in any sort of nitro based varnish or paint .

I will try that first .
cheapest and most DIY solution.

edit : in any case - least time consuming solution is to send both lousy amps to me , for quick check , and proper disposal after that

I'll not charge anything for that ........ sole reason is love to DIY folks

[AudioSan]

Originally Posted by Zen Mod

no kidding in that idea - it's completely sane



good advice - disconnecting speakers and source ( preamp)

if humming is still there - it's certainly xformer

if humming amp share same mains outlet with non-humming amp , influence of DC in mains can be discarded ... so - only cure is to replace mains xformer

b'cause monoblocks are in case , replacing xformers ( by orig. specs) in both is probably more practical than chasing original one for just one amp .

or - removing hummster from amp , de-nuding it and give him a bath in any sort of nitro based varnish or paint .

I will try that first .
cheapest and most DIY solution.

edit : in any case - least time consuming solution is to send both lousy amps to me , for quick check , and proper disposal after that

I'll not charge anything for that ........ sole reason is love to DIY folks

and then you send the chassis to me? for free ofcourse

[Zen Mod]

naah

ya remember Christine's disposal ?

[AudioSan]

hehehe

[ljames]

Thank you guys for the good advise and fast replies. I will try it tomorrow when it's cold. Now it's warm, and when hot/warm states, there is no buzz at all.

And thank you Zen Mod for the offering, it's going to be a big pain shipping these monsters at over 300lb.

[sakellogg]

i have had realy good luck making torid xformers dead quiet by getting them nude, and wrapping with super33, then 1or2 wrap of rubber isolation tape. if you need transformer paint let me know. i have gallons of the good stuff. ill send u some in a can if u pay the shipping.

[a.wayne]

Originally Posted by sakellogg

i have had realy good luck making torid xformers dead quiet by getting them nude, and wrapping with super33, then 1or2 wrap of rubber isolation tape. if you need transformer paint let me know. i have gallons of the good stuff. ill send u some in a can if u pay the shipping.

Hello,

Could you elaborate on this , what if just wrapped in rubbertape...?

[sakellogg]

just wraping in rubber tape is what i do when i unwind or rewind xformers. and it has worked well for me. i use the super33 (eletrical tape) as the first wrap to hold it together then i use the rubber tape.
you could just wrap them in rubber tape. in this case i would make sure that they are clean, and no shorts....etc first then do it.
i guess im saying.....dont use this as a band-aid on a bad xformer. but any hum within reason on good xformers gose away when i do this.