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TFM 45 Rumbling Noise-Help

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crvlvr

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Joined: Sun Mar 18, 2007 5:37 pm

Post Thu Mar 25, 2010 12:56 am

TFM 45 Rumbling Noise-Help

As few months ago it would cut out once in a while and make this rumbling "brrp brrp brrp brrp" noise (similar to a V-twin motorcycle idling is the best I can describe it) from the speakers . I would turn it off for a few minutes and turn it back on and it would be ok.

Now, all it makes is that noise. If I leave it long for too long, it blows the fuse. Fuse has been replaced.

I opened it up and noticed that one of the power supply diodes was broken in two. I got a replacement and soldered it on. But, that did not solve the problem.

I'd like to exhaust most simple fix options before I consider sending it to Rita's as that will probably cost me pretty penny with shipping etc.

I have 2 X15CBs that have been working great for the past 16 years and am kind of disappointed with the TFM- 45 :(

Any suggestions?

Thanks in advance.
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BillD

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(pair of) SILVER-7 TUBE AMPs

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Post Thu Mar 25, 2010 10:39 am

Re: TFM 45 Rumbling Noise-Help

The TFM-45 is a far different beast than a 15. It is a true magnetic field amp, which means it's taking feedback from the amplifier to adjust the voltage and current delivered by the power supply (simplified). Anyway, I would check all your rectifiers. Some are just 4 big diodes (axial) on the circuit board. Some are 4 SIPS. There might even be a big one bolted to the chassis (a D-34 mount).
It should sound like it isn't there!
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F1nut

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Post Thu Mar 25, 2010 10:30 pm

Re: TFM 45 Rumbling Noise-Help

TFM 45 Rumbling Noise-Help


Whenever I get the rumbles I find that a good dump is in order.
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TNRabbit

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Post Thu Mar 25, 2010 10:33 pm

Re: TFM 45 Rumbling Noise-Help

:lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol:
TNRabbit
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helicopterpilotdoug

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Post Fri Mar 26, 2010 5:00 am

Re: TFM 45 Rumbling Noise-Help

F1nut wrote:
TFM 45 Rumbling Noise-Help


Whenever I get the rumbles I find that a good dump is in order.

+1000 on that!! I know exactly what you mean F1nut. :lol:
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crvlvr

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Joined: Sun Mar 18, 2007 5:37 pm

Post Mon Mar 29, 2010 1:04 am

Re: TFM 45 Rumbling Noise-Help

Thanks BillD. I'll go back and check the rest of the diodes
Denon CD Player , Carver CT-17, 2X Carver TFM-15CB, Carver TFM-45, Infinity SM122
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crvlvr

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Posts: 15

Joined: Sun Mar 18, 2007 5:37 pm

Post Fri Apr 02, 2010 12:46 pm

Re: TFM 45 Rumbling Noise-Help

Good news. Replacing another power diode seems to have fixed the problem!! Yippe Ka Yey! Rumbling has been fixed without having to take a dump. Although, I was going to try that next.Thanks again BillD! :)
Denon CD Player , Carver CT-17, 2X Carver TFM-15CB, Carver TFM-45, Infinity SM122

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