|
Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc. |
|
Thread Tools |
9th Dec 2018, 4:44 am | #21 |
Hexode
Join Date: Mar 2008
Location: Melbourne, Victoria, Australia
Posts: 289
|
Re: Help Pls = Grundig TK64 Motor Not running
Yes, i have no explanation, as having traced the wiring, adding the 5uF to the motor tags, between A and C, should have made it work. Because these motor tags go straigh to the 4.3uF capacitor and the motor coils. Oh well..
Video of Chassis Splitting https://www.youtube.com/watch?v=vQTPYFB_KBU Testing after putting it back together https://www.youtube.com/watch?v=A6ZfUJS8Fwo Well, thats the end of the story, and i hope all this helps anyone who wants to restore a TK64, TK60, TK30..etc. They are all pretty much the same. I bought a TK60, just down the road from me 2 days ago, in case i needed parts. Next however will be an immaculate TK46 i bought, almost brand new, just low volume and sound quality not what it should be. One owner bought in Germany, and has every document and about 20 grundig boxed tapes, some unopened !! Museum quality, if there was such a thing..ha. |
9th Dec 2018, 12:38 pm | #22 |
Octode
Join Date: Aug 2008
Location: Rotherham, South Yorkshire, UK.
Posts: 1,700
|
Re: Help Pls = Grundig TK64 Motor Not running
Great news!
Thanks for the write-up, you never know when you might be in the same boat! Peter |
12th Dec 2018, 2:34 pm | #23 |
Hexode
Join Date: Mar 2008
Location: Melbourne, Victoria, Australia
Posts: 289
|
Grundig TK64 "The story continues" Head Coil open on one Channel
Hi all the Grundig addicts
After 13 videos and lots of work over the past few months, i though i had fully restored my Grundig TK64. https://www.youtube.com/watch?v=A6ZfUJS8Fwo While testing i realised the switch was in MONO all this time, and while its records and plays well in MONO, when i switched it to STEREO, only the left channel was playing...oh dear ! Investigation has shown one of the two coils in the head is open circuit ! hence the problem. See photos. I have a TK60 for spares and possible restoration one day, and its hard to believe but the head is working, BUT its about 500 ohms per coil. Unfortunately the whole rest of the unit needs restoration. QUESTIONS: Given the chances of getting a working head for this model is rather slim, has anyone tried to transplant a more modern head ? The working coils restistance is about 1K ohms. Perhaps i can just find another one with a similiar resistance and physical fit ? PS: A photo of my latest addition a TK46 that is like new, with every factory document, including deliver tags with the serial number. Will do a video on it, after i replace the belts and pinch roller. The rest is working well. |
12th Dec 2018, 3:25 pm | #24 |
Hexode
Join Date: Mar 2008
Location: Melbourne, Victoria, Australia
Posts: 289
|
Re: Grundig TK64 "The story continues" Head Coil open on one Channel
As this is a Record / Play head, and the later units like the TK46 have a separate Record / play head, can someone explain whats the difference in design that allows one type to Record / Play and the others as being PLAY or RECORD only.. TKs
|
15th Dec 2018, 2:01 pm | #25 |
Hexode
Join Date: Mar 2008
Location: Melbourne, Victoria, Australia
Posts: 289
|
Re: Help Pls = Grundig TK64 Motor Not running
This afternoon i came across a Sony TC-230W, Stereo Reel to Reel, with an integrated Record/Play head. So i bough it
Opened it up and its almost immaculate inside, cant see any corrosion or rust of anything that warrants its fate.. The motor works like a dream, cant tell if its running. The power supply has an internmittent problem, sometimes there is power somethings there is not, when i was shaking the chassis around it came to life and then went off again...oh well I removed the play / record head, and unfortunately its on 27 ohms per coil !! as opposed to theTk64 which is 1K ohms, and the TK60 which is about 500 per coil.. So looks like transistor unit heads have a low resistance compared to valve unit... so the hunt countinues.. now what to do with the Sony TC-230W....hmmm |
16th Dec 2018, 1:35 am | #26 | ||
Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
|
Re: Help Pls = Grundig TK64 Motor Not running
Quote:
Quote:
__________________
If I have seen further than others, it is because I was standing on a pile of failed experiments. |
||
26th Dec 2018, 8:34 am | #27 |
Hexode
Join Date: Mar 2008
Location: Melbourne, Victoria, Australia
Posts: 289
|
Re: Help Pls = Grundig TK64 Motor Not running
Hi Julie M, thanks for posting a response.
I do understand the current amplifier vs the voltage amplifier, but having measured the voltage during record at the head, its only about 17V, which is the bias Osciallator that is being amplitude modulated. I will keep looking around for another stereo head from a mid 60's valve 4 track, i think one of those would have to be very close to the TK64's head. I have quite a few of these Grundigs now, so will keep playing with them for a while, just connected a old BSR record changer and playing it though the Grundig TK64. Also got a TS-340 Grundig R2R recently and few more on the way...ha. |
29th Dec 2018, 11:46 am | #28 |
Hexode
Join Date: Mar 2008
Location: Melbourne, Victoria, Australia
Posts: 289
|
Re: Help Pls = Grundig TK64 Motor Not running
Good Morning,
I have managed to buy a TK60 head from Germany, once it arrives i will see if it works in the TK64. But for now, it works well, Playback in Stereo is great, from tapes and the turntable Record is great, but with the switch in mono. Sound is excellent, loud and clear. Must have been something in 1962 I made a youtube video of it recording and playback in Mono. https://www.youtube.com/watch?v=DDNKTguzkuk Hope you like watching |