grundig tk46 troubleshoot

thetinker · 27th April 2009, 03:32 PM

hi all, i'm new here and was wondering if someone could help me trouble shoot a grundig tk46 reel to reel player. i've always wanted a reel to reel player, but never found an affordable one. i was at a church garage sale and found a very clean tk46 for $1, i couldn't pass it up. i got it home turned it on and got an extremely loud buzz/hum from the speakers. so far the extent of my troubleshooting has been to check all the tubes and wiring and all seem to be ok. i removed the ell80 tube and the buzz went away, but i'm not sure what that tells me. if anyone has had experience with this problem or this unit i would appreciate any advice. thanks

gpapag · 27th April 2009, 06:23 PM

Hi thetinker

The ELL80 is a dual power pentode.

The buzz went away because you removed the active parts from the output stage (no output power more, no sound coming out)

My advice is to:

1. Replace the electrolytic capacitors, especially from the power supply and the cathodes of the audio section tubes. Dried out el. caps are the usual source of buzz
2. Replace the paper caps.
3. Look for shorted (to chassis) wires.
4. Look for burned-out resistors.
5. Find the wiring diagram. Read the DC voltages and current and compare with the measured in your machine.
6. Report back

Regards
George

gpapag · 27th April 2009, 06:35 PM

Service Manual
Regards
George

thetinker · 28th April 2009, 01:54 AM

thanks george, i appreciate the advice, now i have a better place to start.
i'll get back to you.

27th April 2009, 03:32 PM	#1
thetinker diyAudio Member Join Date: Apr 2009	grundig tk46 troubleshoot hi all, i'm new here and was wondering if someone could help me trouble shoot a grundig tk46 reel to reel player. i've always wanted a reel to reel player, but never found an affordable one. i was at a church garage sale and found a very clean tk46 for $1, i couldn't pass it up. i got it home turned it on and got an extremely loud buzz/hum from the speakers. so far the extent of my troubleshooting has been to check all the tubes and wiring and all seem to be ok. i removed the ell80 tube and the buzz went away, but i'm not sure what that tells me. if anyone has had experience with this problem or this unit i would appreciate any advice. thanks

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27th April 2009, 06:23 PM	#2
gpapag diyAudio Member Join Date: Nov 2002 Location: Athens-Greece	Hi thetinker The ELL80 is a dual power pentode. The buzz went away because you removed the active parts from the output stage (no output power more, no sound coming out) My advice is to: 1. Replace the electrolytic capacitors, especially from the power supply and the cathodes of the audio section tubes. Dried out el. caps are the usual source of buzz 2. Replace the paper caps. 3. Look for shorted (to chassis) wires. 4. Look for burned-out resistors. 5. Find the wiring diagram. Read the DC voltages and current and compare with the measured in your machine. 6. Report back Regards George

27th April 2009, 06:35 PM	#3
gpapag diyAudio Member Join Date: Nov 2002 Location: Athens-Greece	Service Manual Regards George

28th April 2009, 01:54 AM	#4
thetinker diyAudio Member Join Date: Apr 2009	thanks george, i appreciate the advice, now i have a better place to start. i'll get back to you.

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