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Carver TFM-55x Input Impedence

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thsmith

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Joined: Wed Nov 19, 2008 8:55 am

Post Tue Jun 30, 2009 8:19 pm

Carver TFM-55x Input Impedence

Getting ready to send my TFM-45 out for service and need to put the 55x in service.

If anyone has access to a 55x manual I need to know the input impedence.

Thanks,

TS
TFM-45
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BillD

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(pair of) SILVER-7 TUBE AMPs

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Joined: Wed Jun 06, 2007 8:29 pm

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

Post Tue Jun 30, 2009 8:33 pm

Re: Carver TFM-55x Input Impedence

I don't have a 55x manual, but the TFM-55 (no x) says 47k ohms.
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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RichP714

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Posts: 1814

Joined: Fri Oct 12, 2007 2:12 pm

Post Tue Jun 30, 2009 9:05 pm

Re: Carver TFM-55x Input Impedence

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thsmith

Newbie

Posts: 23

Joined: Wed Nov 19, 2008 8:55 am

Post Wed Jul 01, 2009 7:53 am

Re: Carver TFM-55x Input Impedence

Thanks all !
TFM-45
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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 Wed Jul 01, 2009 10:39 am

Re: Carver TFM-55x Input Impedence

Reading those specs, it's no wonder that most of us need to attenuate our sources a lot. That 55x has an input sensitivity of 1.5v (that drives it to rated power). Many digital output devices deliver 3v or more. That didn't used to be the norm. For instance, the fixed output on my Kenwood KT-8300 tuner is 0.75v and 1v for my Nakamichi cassette player.
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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thsmith

Newbie

Posts: 23

Joined: Wed Nov 19, 2008 8:55 am

Post Wed Jul 01, 2009 5:39 pm

Re: Carver TFM-55x Input Impedence

I am so glad I checked here because I was going to assume the same Input Impedance as my TFM-45 which is 115Kohms.

HUGE differences.

Thanks again.
TFM-45
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RichP714

SILVER-7t

Posts: 1814

Joined: Fri Oct 12, 2007 2:12 pm

Post Wed Jul 01, 2009 11:15 pm

Re: Carver TFM-55x Input Impedence

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thsmith

Newbie

Posts: 23

Joined: Wed Nov 19, 2008 8:55 am

Post Wed Jul 08, 2009 6:05 pm

Re: Carver TFM-55x Input Impedence

RichP714 wrote:
Capture.JPG

Thanks Rich. The SN on my TFM-45 is 114001, I assume that makes mine prior to those SN numbers and the higher Input Impedence ?
TFM-45
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lukewayne

Newbie 50+

Posts: 60

Joined: Thu Sep 03, 2009 9:32 pm

Post Fri Sep 11, 2009 1:32 am

Re: Carver TFM-55x Input Impedence

I searched around a bit. And couldn't find much of an answer on this forum. Cam someone tell me what is input impedence and how does it affect amps/preamps.
Panasonic TH-50PZ800U; Sony BDP-S350
Sony STR-DA5400ES; Carver TFM-35; TFM-55; a500x
Sony Playstation 3; Custom HTPC
Polk Monitor 10B Front; Polk CS350LS Center;
Polk Monitor 5B rears; Velodyne VA1012XII sub

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