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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc.

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Old 12th Apr 2021, 1:11 pm   #61
Edward Huggins
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Default Re: Reps JC20 Reel to Reel

I'm not quite sure where this long and detailed Thread is going?
As far back as Post#42, the OP has clearly stated that he does not wish to use his equpment for music reproduction - they are just for Show only. And here we all are suggesting circuit tweaks...
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Old 12th Apr 2021, 3:36 pm   #62
Starlight 1
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Default Re: Reps JC20 Reel to Reel

I have taken it in today for a full check over and to fit all new capacitors. I'll post back when it's all done.

Thanks all for your help. Les
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Old 18th Apr 2021, 7:36 pm   #63
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Default Re: Reps JC20 Reel to Reel

I like to say thanks to the man for doing this work for me I do a full post later as I still have lots of work to do .
Les
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Old 19th Apr 2021, 6:05 pm   #64
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Default Re: Reps JC20 Reel to Reel

After the electrics were done I now realise I have mechanical problems.
The 2 white and 2 black drive wheels are much smaller than the originals.
I played a tape which sounds like Mickey Mouse and the nearest settings were
3 3/4. I recorded it onto the computer, made adjustments until the speech
became clear and it's running 0.562 out. My plan now is to take the 2 aluminium
take-up pulleys which the rubbers run on, measure all the sizes, lathe new pulleys and add the 0.562 which should bring everything back into spec.
Long way going about it but don't think these rubbers will be obtainable anymore. Just to add the man who did the electrics said the amplifier and the volume is outstanding quality and he was quite happy playing his radio through it.
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Old 20th Apr 2021, 7:00 am   #65
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Default Re: Reps JC20 Reel to Reel

Before going to all that bother, (which sounds counter-productive to me - apologies) can you try a selection of other tapes? I'd send you a studio-quality 7.5ips tape foc but I can't get to the post at the mo.
Graham
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Old 20th Apr 2021, 7:06 am   #66
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Default Re: Reps JC20 Reel to Reel

Quote:
Originally Posted by Starlight 1 View Post
The 2 white and 2 black drive wheels are much smaller than the originals.
How do you know this ?

David
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Old 20th Apr 2021, 4:45 pm   #67
Starlight 1
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Default Re: Reps JC20 Reel to Reel

Quote:
Originally Posted by llama View Post
Before going to all that bother, (which sounds counter-productive to me - apologies) can you try a selection of other tapes? I'd send you a studio-quality 7.5ips tape foc but I can't get to the post at the mo.
Graham
That very nice of you my play back rate is set to 1.00000
and work out RPM on the same tape is 65 so if you add the RPM that will help a lot
Thanks Les
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Old 20th Apr 2021, 4:58 pm   #68
Starlight 1
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Default Re: Reps JC20 Reel to Reel

Quote:
Originally Posted by DMcMahon View Post
Quote:
Originally Posted by Starlight 1 View Post
The 2 white and 2 black drive wheels are much smaller than the originals.
How do you know this ?

David
at 3 3/4 it play ok forwards and backwards------ on fast only work one way--- If I set it to15 fast forwards and back ok so its pushing the rubbers out more adding weight to the take up spools.
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Old 21st Apr 2021, 7:38 pm   #69
Starlight 1
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Default Re: Reps JC20 Reel to Reel

I tried an experiment today. I glued a piece of rubber band to the pulley refitted it to the left side as there was no drive in reverse. This greatly improved the drive and I had to take all the weight off to get it to move as it was really too big. The join in the elastic band makes the tape jump on rotation and it lost all drive on fast forward. Repeating my earlier experiment it was running at 65rpm now it is running at 74rpm to sound the same. I have removed the elastic band but my theory on rubber shrinking or wearing down seems to be correct.
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Old 25th Apr 2021, 7:01 pm   #70
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Default Re: Reps JC20 Reel to Reel

I have got there in the end after taking 3 days off, the problem was the counter pully belt mods can close this post as it all done .
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Old 25th Apr 2021, 7:33 pm   #71
Starlight 1
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Default Re: Reps JC20 Reel to Reel

IF the tape that come with it was last used in 1973
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Old 26th Apr 2021, 12:58 pm   #72
Analogue man
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Default Re: Reps JC20 Reel to Reel

Quote:
Originally Posted by Starlight 1 View Post
After the electrics were done I now realise I have mechanical problems.
The 2 white and 2 black drive wheels are much smaller than the originals.
I played a tape which sounds like Mickey Mouse and the nearest settings were
3 3/4. I recorded it onto the computer, made adjustments until the speech
became clear and it's running 0.562 out. My plan now is to take the 2 aluminium
take-up pulleys which the rubbers run on, measure all the sizes, lathe new pulleys and add the 0.562 which should bring everything back into spec.
Long way going about it but don't think these rubbers will be obtainable anymore. Just to add the man who did the electrics said the amplifier and the volume is outstanding quality and he was quite happy playing his radio through it.
The size of the rubber wheels should make no difference to the capstan speed but the white one will affect the take up spool speed but that alone should not make the tape run slow. Are you sure that you are not running 60hz motors on 50hz mains?
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