It's the pre/pro and NOT the amp
NeilGabriel
Posts: 1,487
Dumb move here....took my amp in to get tested and hopefully fixed....got home and decided to hook pre/pro up to the main ins of an integrated amp I have....and that screeched the same way the amp had done.
I touched the top of the pre/pro and it was very hot. Even sitting in sleep mode, it is very hot.
I checked the one fuse, and it seems good....but I assume I wouldn't have any out put at all if it was a fuse?
Any good ideas on what might trouble the pre (B&K Ref 20).
Thanks
I touched the top of the pre/pro and it was very hot. Even sitting in sleep mode, it is very hot.
I checked the one fuse, and it seems good....but I assume I wouldn't have any out put at all if it was a fuse?
Any good ideas on what might trouble the pre (B&K Ref 20).
Thanks
Post edited by NeilGabriel on
Comments
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More information specifically about the pre and its history will only help us to help you. Otherwise, I doubt you will get a response to this thread. A pre, unless it it a heavily tubed unit, should not be hot.~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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Thanks. The B&K Ref 20 is an older 5 channel pre/pro....solid state.
I am not sure what sort of specs to post. The specs are on p. 49 of the manual (link below)...I scanned the pages, but cannot seem to attach the scanned document to this reply.
http://www.bkcomp.com/fileadmin/content/content_products/manuals/Past/Preamp%20or%20receiver/REF20.pdf
The troubleshooting page of the manual suggests grounding issues when there is a loud hum, but I had run this for a year or more with no problems and am running an integrated amp now with no problems out of the same outlets.
When in sleep mode, the top, right side of the unit is almost too hot to touch.
I will try to post the specs page in a separate post....I really could use some ideas on this, or else I'll call B&K and send it in for repairs (if possible). -
You got a pair of headphones available?~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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A pre, unless it it a heavily tubed unit, should not be hot.
Not true, my Adcom has a large external heat sink for the class A tranny's in the front end. It doesn't get scalding but it gets warm to mildly hot, which is normal. And that's with the heat sink on the outside.
The question is for the OP; did it always get hot or is this something new?
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
Even my Anthem tubed Pre doesn't get more than warm. No power output tubes to generate a lot of heat. Sounds like you've got a pre that needs servicing unless some other heat source is making it hot. I had a B&K Ref 10 and it rarely got hot to the touch.____________________________________________________________
polkaudio Fully Modded SDA SRS 1.2TLs + Dreadnaught, LSiM706c, 4 X Polk Surrounds + 4 X ATMOS, SVS PB13 Ultra X 2, Pass Labs X1, Marantz 7704, Bob Carver Crimson Beauty 350 Tube Mono Blocks, Carver Sunfire Signature Cinema Grande 400x5, ADCOM GFA 7807, Panasonic UB420, Moon 380D DAC, EPSON Pro Cinema 6050 -
I put headphones in the pre with it in sleep and on modes and get the same schreech/hum though it is much quieter because that is how the goofy headphone output works on the B&K.
The pre does get hotter than my amp. In the picture (attached), the heat comes from the maze of copper, but the rectangular piece in front that says Ensign Corporation is too hot to even touch.
Sorry for all the posts, but I really liked this unit. I ran it with a big parasound 5 channel and then moved into a two channel set up.
Thanks a whole lot. -
Yep, in for repair, sound like a power supply problem. Don't power it up anymore."Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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On your pre and not your amp?Not true, my Adcom has a large external heat sink for the class A tranny's in the front end. It doesn't get scalding but it gets warm to mildly hot, which is normal. And that's with the heat sink on the outside.
You know I love's ya' bro' but come on man.....that can't be true. If it is? I learned something new today. All of my pre's have been lukewarm at best and I've had a few more than many.....
????~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~ -
Thats the power transformer and if it's getting that hot would indicate a fault down stream is pulling excessive current through it.NeilGabriel wrote: »but the rectangular piece in front that says Ensign Corporation is too hot to even touch. -
On your pre and not your amp?
You know I love's ya' bro' but come on man.....that can't be true. If it is? I learned something new today. All of my pre's have been lukewarm at best.
Yes on the pre, and perhaps I exaggerated just slightly (like a good politician) about it getting hot. But it does get warmer than luke warm, but not burning. Here's a quick and dirty pic.
"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
Thats the power transformer and if it's getting that hot would indicate a fault down stream is pulling excessive current through it.
Any idea on whether that is an expensive repair....the unit might be worth about $300 now (in working condition).
Thanks for advice....I know that is a tough question.
I'm headed to vo-tech to learn audio electronics! -
It would be just guessing without taking a look.Your best bet would be to find a compitent tech that will look at it then give an estimate before doing the work.He would likely charge a minmal fee for his time if you decline the repair.NeilGabriel wrote: »Any idea on whether that is an expensive repair....
