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Telefunken studio deck issue


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#1 baddboybill

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Posted 09 January 2019 - 02:12 PM

Sound is quiet and when you raise volume I get loud background hum. Also slow speed. I’ve done all usual things. New belts and pinch roller. Clean and lube. Checked all connections on deck and unfortunately the motor has a hole for adjustment but nothing to actually adjust through the hole. The wiring to heads are sorta crappy but seem ok and the ground are good. Any ideas

#2 baddboybill

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Posted 10 January 2019 - 05:00 AM

I’m wondering if the head is bad. The meters seem to be working fine to music.

#3 docs

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Posted 10 January 2019 - 05:05 AM

Got to trace it out really bill. Other than the usual suspects of leaf switches and that on the deck.

Do you have the service manual to trace out the audio from the deck head and test voltages at the rec/playback amp?



#4 baddboybill

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Posted 10 January 2019 - 05:26 AM

Got to trace it out really bill. Other than the usual suspects of leaf switches and that on the deck.
Do you have the service manual to trace out the audio from the deck head and test voltages at the rec/playback amp?

.

Lol in german.

#5 Transistorized

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Posted 10 January 2019 - 06:33 PM

I wonder if these have a record bar that might get dirty? I know you had mentioned that you had lubed / cleaned and the record bar I'm sure was part of your cleaning. Wondering if it may be beyond cleaning.

 

Curious to see if it records that same issue/hum onto a tape when recording from an input or radio. Then play that tape back on a known good working machine and examine the recording. 



#6 docs

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Posted 11 January 2019 - 03:27 AM

The play/rec heads goes directly into the Record bar...

 

Attached File  1M record bar.jpg   103.7K   2 downloads



#7 baddboybill

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Posted 11 January 2019 - 09:15 PM

The play/rec heads goes directly into the Record bar...

1M record bar.jpg


I’m in process of changing the head and wiring because head looks a little rusty and wires are very thin and brittle. I also ordered a new motor because there is absolutely no adjustment on original even though there is hole for one. It’s just a hole after looking inside. I also did a better job cleaning the record switches and playback switch since I was able to get to them easier. So I’m hoping after doing all this everything will work!!! Thank you for the scheme. ;-)

I wonder if these have a record bar that might get dirty? I know you had mentioned that you had lubed / cleaned and the record bar I'm sure was part of your cleaning. Wondering if it may be beyond cleaning.

Curious to see if it records that same issue/hum onto a tape when recording from an input or radio. Then play that tape back on a known good working machine and examine the recording.


The hum is only through tape so hopefully after recleaning record/playback switches and changing head and wires it will take care of issues. Thank you