Carver TFM-35x issues

I’m looking for a little bit of guidance here. The amp worked fine for a month and last night getting ready to watch a movie I turned the power on and had the normal sound of what seems like magnetic solenoid closing, and then a click which was normal, but this time no sound and a few seconds later another “click” this went on with no changes until powering off.

I’m assuming it’s going into protection but I’m not sure why. With nothing plugged into it I get the same thing. Any advice on what to check?

Comments

  • daddyjtdaddyjt Posts: 864
    Are you competent and comfortable working inside electronics? Do you have a multi-meter that reads down to mv?

    If so, pop the cover and check the power supply voltage, and see if you can adjust bias.

    Here’s a link to the service manual:

    http://thecarversite.com/manuals/mandir/Carver TFM-35x service manual.pdf
    Too much stuff to keep track of.

    Currently enjoying: Legacy Focus 20/20, McCormack DNA 225, Bill D C1, Oppo 105
  • Joshwest90Joshwest90 Posts: 69
    daddyjt wrote: »
    Are you competent and comfortable working inside electronics? Do you have a multi-meter that reads down to mv?

    If so, pop the cover and check the power supply voltage, and see if you can adjust bias.

    Here’s a link to the service manual:

    http://thecarversite.com/manuals/mandir/Carver TFM-35x service manual.pdf

    I am comfortable with electronics and soldering desoldering things. I have a fluke DMM that should read to MV. I’ve never adjusted bias or frankly I don’t even know what that means so I will do some research to understand it better.
  • audioluvraudioluvr Posts: 1,241
    Sounds like it's time for Rolland at Hi-Tech to give it a refresh. Where are you located?
    Home System:
    SDA 1C's - Full mod with the help by Dave...
    1000 Va Dreadnought- w/ WireWorld Mini-Eclipse cables
    WireWorld Mini-Eclipse 7 speaker cables
    WireWorld Silver Eclipse IC's
    Cambridge Audio Azur 851N - DAC/Streamer
    B&K Reference 50 Pre/Pro
    B&K M200 Sonata Monoblocks
    BLE-Design 16mm Power Cables
    Denon DVD 2900

    Barn system:
    SDA SRS 2.3's Full mod done by myself
    Carver C-1 pre
    Carver M1.5t
    BluDenso - Bluetooth receiver/DAC
  • Joshwest90Joshwest90 Posts: 69
    audioluvr wrote: »
    Sounds like it's time for Rolland at Hi-Tech to give it a refresh. Where are you located?

    I live in southern Illinois
  • pitdogg2pitdogg2 Posts: 13,489
    Joshwest90 wrote: »
    audioluvr wrote: »
    Sounds like it's time for Rolland at Hi-Tech to give it a refresh. Where are you located?

    I live in southern Illinois

    I live in central Illinois and use him exclusively for my Carver work.

  • Joshwest90Joshwest90 Posts: 69
    pitdogg2 wrote: »
    Joshwest90 wrote: »
    audioluvr wrote: »
    Sounds like it's time for Rolland at Hi-Tech to give it a refresh. Where are you located?

    I live in southern Illinois

    I live in central Illinois and use him exclusively for my Carver work.

    Where is he out of?
  • daddyjtdaddyjt Posts: 864
    audioluvr wrote: »
    Sounds like it's time for Rolland at Hi-Tech to give it a refresh. Where are you located?

    No offense intended, but what you’ll pay for a repair refresh on that amp is more than it is worth. I say this as an avid Carver fan and active tech. The 35x is not a mag-coil design, contrary to popular belief - it is a straight class A/B transformer amp. It is a good amp, but not a great amp.

    Further, the “x” models were designed WITHOUT a removable bottom cover. Therefore, servicing requires removal of ALL the output devices and commutators from the heat sink, then standing the PCB up within the chassis to reach the foil side of the board. Some people try to “short cut” the process by freeing the heat sinks themselves from the chassis, and leaving all the transistors attached. This is a BAD idea, as the weight of the heat sinks puts far too much stress on the transistors, PCB and pads. There’s just no easy way to do it - I’ve done three of them, and I will never do another.

    If you want to do some basic troubleshooting, I can help you. However, if the relays are engaging, that rules out most easy fixes. One easy thing to check is DC at the output - hook you meter probes to the +/- speaker posts (one channel at a time) and set your meter for DC voltage. We are looking for any reading < about 50mv, with the amp turned on, no input and no load (speakers) hooked up.
    Too much stuff to keep track of.

    Currently enjoying: Legacy Focus 20/20, McCormack DNA 225, Bill D C1, Oppo 105
  • audioluvraudioluvr Posts: 1,241
    edited June 24
    daddyjt wrote: »
    No offense intended, but what you’ll pay for a repair refresh on that amp is more than it is worth.

    Good point. Wasn't aware. Besides there is a nice B&K 200.2 in the for sale ads that would be an excellent bump up from the 35x
    Home System:
    SDA 1C's - Full mod with the help by Dave...
    1000 Va Dreadnought- w/ WireWorld Mini-Eclipse cables
    WireWorld Mini-Eclipse 7 speaker cables
    WireWorld Silver Eclipse IC's
    Cambridge Audio Azur 851N - DAC/Streamer
    B&K Reference 50 Pre/Pro
    B&K M200 Sonata Monoblocks
    BLE-Design 16mm Power Cables
    Denon DVD 2900

    Barn system:
    SDA SRS 2.3's Full mod done by myself
    Carver C-1 pre
    Carver M1.5t
    BluDenso - Bluetooth receiver/DAC
  • CH46ECH46E Posts: 1,024
    If you like the sound of your TFM then spending a bit more to keep enjoying it is worth it. Even if it may cost as much as you could buy another for. But this way you know you have a newly refurbished unit that should give another 20 years of enjoyment.

    I spent a lot to have a TFM45 done and I'm glad I did.
  • pitdogg2pitdogg2 Posts: 13,489
    CH46E wrote: »
    If you like the sound of your TFM then spending a bit more to keep enjoying it is worth it. Even if it may cost as much as you could buy another for. But this way you know you have a newly refurbished unit that should give another 20 years of enjoyment.

    I spent a lot to have a TFM45 done and I'm glad I did.

    The TFM 45 is a much different beast than the TFM35x. @daddyjt is very knowledgeable on Carver and I trust what he has to say, if he says it's not worth the time and cost you can believe it.

  • CH46ECH46E Posts: 1,024
    It's not always about the money. That's all I'm trying to say. If he likes the amp i say repair it. Dont matter what its worth.
  • verbverb Posts: 6,590
    CH46E wrote: »
    It's not always about the money. That's all I'm trying to say. If he likes the amp i say repair it. Dont matter what its worth.

    Every hobby IMO is defined as sort of a money pit! I never expect to get back what I put into it. Otherwise it'd be called a business! And where's the fun in that?

    Our dear brother @DSkip notwithstanding of course! :smile:
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, Marantz CD-1, Marantz AMP-1, Denon UDR-F10 Cassette, Acoustic Technologies Classic Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Pioneer SX-N30 Network Receiver, Pioneer PD10AE CD Player, Furman M8-LX Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • Tony MTony M Posts: 8,122
    Yup.
    Many of us here have said " If it sounds good to you, that's all that matters". ;)

    If you have the coin and want to explore and maybe hear a better sound, go for it, as long as it doesn't take away from the bills and necessities.
    Most people just listen to music and watch movies. I EXPERIENCE them.
  • daddyjtdaddyjt Posts: 864
    CH46E wrote: »
    It's not always about the money. That's all I'm trying to say. If he likes the amp i say repair it. Dont matter what its worth.

    I certainly meant no disrespect to the OP. I was merely trying to point out that there are a myriad of other (better?) options out there for the $300+ a repair/refresh on a 35x will cost. In my experience, the 35(x) doesn’t really have a specific “sound” to it, unlike other “TFM” amps (I’ve owned two 35x and a 35). That said, and like others have said here, if it’s what he likes, then by all means, get it back up and running.

    The 45 is an entirely different design (mag-coil, switching rail design), and typically well worth the cost of a repair/refresh, if for no other reason than resale.
    Too much stuff to keep track of.

    Currently enjoying: Legacy Focus 20/20, McCormack DNA 225, Bill D C1, Oppo 105
  • CH46ECH46E Posts: 1,024
    I did not take any offense to what anyone one said. Just throwing out my .02.👍👍
  • CH46ECH46E Posts: 1,024
    daddyjt wrote: »
    CH46E wrote: »
    It's not always about the money. That's all I'm trying to say. If he likes the amp i say repair it. Dont matter what its worth.

    I certainly meant no disrespect to the OP. I was merely trying to point out that there are a myriad of other (better?) options out there for the $300+ a repair/refresh on a 35x will cost. In my experience, the 35(x) doesn’t really have a specific “sound” to it, unlike other “TFM” amps (I’ve owned two 35x and a 35). That said, and like others have said here, if it’s what he likes, then by all means, get it back up and running.

    The 45 is an entirely different design (mag-coil, switching rail design), and typically well worth the cost of a repair/refresh, if for no other reason than resale.

    To be 100% honest, I did know that if I did not like it, I could recover all of my cost if I sold it. However, I have really come to like the amp and dont forsee selling it anytime soon.
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