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TFM-25 needing repair

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homerjsimpson

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Newbie

Posts: 20

Joined: Tue Oct 21, 2008 12:21 pm

Location: RALEIGH, NC

Post Sun Feb 14, 2010 9:02 am

TFM-25 needing repair

I am in the process of picking up a Carver TFM-25. It plays fine at low volumes but gets a little distorted and tinny at high volumes. Is this easily fixable? I know it has been mostly recapped. Prolly not been adjusted. I do not think any of the service bulletin updates have been done either.

Where can i get the Service Bulletins and the Service manual?

Thoughts ?
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BillD

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(pair of) SILVER-7 TUBE AMPs

Posts: 7295

Joined: Wed Jun 06, 2007 8:29 pm

Location: The west's most mid-western town, Scottsdale, Arizona

Post Sun Feb 14, 2010 9:19 am

Re: TFM-25 needing repair

Start looking HERE
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
_________________
Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, M-400 (2), C-500, M-500, M-500t, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr.)
Sunfire:Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer
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homerjsimpson

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Newbie

Posts: 20

Joined: Tue Oct 21, 2008 12:21 pm

Location: RALEIGH, NC

Post Sun Feb 14, 2010 9:24 am

Re: TFM-25 needing repair

Thank you, I found that and a few other helpful posts. I can easily do the service bulletin updates. I just want to make sure it will be easily fixable by me. Just want to make sure its not bad outputs etc...
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homerjsimpson

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Newbie

Posts: 20

Joined: Tue Oct 21, 2008 12:21 pm

Location: RALEIGH, NC

Post Sun Feb 14, 2010 9:28 am

Re: TFM-25 needing repair

I have found the Service Manual. !!!
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BillD

User avatar

(pair of) SILVER-7 TUBE AMPs

Posts: 7295

Joined: Wed Jun 06, 2007 8:29 pm

Location: The west's most mid-western town, Scottsdale, Arizona

Post Sun Feb 14, 2010 10:40 am

Re: TFM-25 needing repair

See, all good things come to those who search.
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
_________________
Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, M-400 (2), C-500, M-500, M-500t, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr.)
Sunfire:Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer
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homerjsimpson

User avatar

Newbie

Posts: 20

Joined: Tue Oct 21, 2008 12:21 pm

Location: RALEIGH, NC

Post Thu Apr 01, 2010 6:21 pm

Re: TFM-25 needing repair

Well I put in the new transistors per the service manual. However, it is still not right. It will randomly go in and out of protection. On one channel the dc off set is perfect. On the other it is around 350mv. Also I can not seem to adjust either Idle current. When I connect the meter to the test points, it is exactly 0 on both channels. Guess it's back to the drawing board....
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gunner64

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Posts: 44

Joined: Sun Mar 14, 2010 11:57 am

Location: Dubuque,Iowa

Post Fri Apr 02, 2010 11:12 am

Re: TFM-25 needing repair

Hi,I had a problem With my TFM-45 with not being able to get bias voltage at the test point due to the adjustment Pot being dirty,and some bad solder joints on the amp boards around the bias pots(especially the Pot/board connection itself)Try a little deoxit on the Pots,and touch up any solder joints that look suspect.I've never worked on a TFM-25 so I can't be specific to your amplifier,But I did this to my 45 when was experiencing a similar problem and These steps solved the problem completely,bias is rock steady now.Hope this helps.Good luck!!!!
Robert
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homerjsimpson

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Newbie

Posts: 20

Joined: Tue Oct 21, 2008 12:21 pm

Location: RALEIGH, NC

Post Fri Apr 02, 2010 8:38 pm

Re: TFM-25 needing repair

Thanks for the tips, I'll give them both a try...

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