View Full Version : Help on RtoR rebuild


Charles
06-15-2005, 09:13 PM
Folks,

Help me out, if you can. I've a pile of old Teac RTR's lying around, I would like to get my A-4070G up to snuff. I've had some success with a tech, but I have the feeling he's sneaking up on me, what he says doesn't make sense (when it comes to trading/money).

I just want someone's who can do the work, & is honest. I know it ain't cheap, don't care. I'll pay. But I do not like looking over my shoulder.

Any recommendations?

Thanks in advance, Charles

Strawman
06-16-2005, 10:16 AM
You can check with AK user JBLMAR, was very helpful to me with a TEAC issue and an all around nice guy. Send him a PM. :thmbsp:

mhardy6647
06-16-2005, 10:41 AM
AK Denizen VintageTX
http://www.angelfire.com/electronic2/vintagetx/

dr*audio
06-16-2005, 10:45 AM
Where are you located? It is tough to ship reel to reels around the country to get them fixed. They're heavy, and a bit fragile at the same time; the guide arms, and reel spindles can get damaged in shipping.

Strawman
06-16-2005, 07:40 PM
I forgot about VintageTX, he knows what is what too.

Vintage TX
06-17-2005, 12:12 AM
Thanks for the comment Strawman, but right now I am swamped with work.
I need a couple of months to catch up on things around here before taking on more repairs.
The recent computer mess and some other things put me far behind on the regular schedule. :sigh:

Charles, what is wrong with your Teac, can you describe the problems ?

Charles
06-18-2005, 09:00 AM
Thanks for the help.

In response to DR Audio, I live in Central Missouri, where there is a noticable lack of tech's who work on anything of a vintage nature.

In response to Vintage TX. The amp seems weak on one channel, & the reels won't turn at the proper speeds. Just needs a good overhaul.

As far as shipping, I've the factory box this monster came in, plus two parts machines. This particular machine is in superb cosmetic shape, with all of the bells & whistles (dust cover, wired remote, RE711 reel), which is why I would like it restored. Not to mention it records in both directions, which is a nice feature.

TX, I'm in no hurry, if you want to take a look at in in a few months, let me know.

Back to shipping. one of the parts machines showed up with a single layer of bubble wrap around it & packed without any other padding in a flimsy assed box. When it arrived, the box looked like it had been run over with the reel locks sticking through the side. This was a packing job by the pro's at either Mailboxes Etc. or the UPS Store. And I was charged dearly for this.

Thanks again, Charles.

www.records
06-18-2005, 07:47 PM
Charles, I can't help ya with your R2R, but just wanted to say hi to another member from Missouri. I live in Joplin. Do you live close?

wordman001
06-18-2005, 08:02 PM
Charles: Why not try it yourself, you'd be surprised what you can accomplish with us all for tech help and advice and TWO FRIKIN PARTS MACHINES !!!!!

Heck, we can start the assy line up again with all that hardware- Joe :banana: :banana: :banana: :banana: :banana:

You need to lube the reel motors, the capstan motor and replace the belt. After that we'll know if you have a problem or not !

Fisherdude
06-18-2005, 08:16 PM
Hi Charles,

I also have a nice 4070G. I'm nowhere near the knowledge level of some of the guys here, but I'll try to help a bit.

You mentioned that the reels don't turn at the right speed. Do you mean that the sound is warbly and uneven when it plays? The playback speed is controlled by the capstan motor shaft pinching the tape against the pinch roller. If the pinch roller is hard or glazed and not clean and soft you will definitely get slippage. Have you cleaned the pinch roller? It's not likely that you have problems with the reel motors themselves.

You will need to replace the capstan drive belt. I got mine from Bob at Vintage Electronics for about $15. Great service! Might as well replace the counter drive belt while you're at it.

Also, the pinch roller assembly works on a pivoting mechanism. This pivot has to be free and easily movable, otherwise it won't be able to apply the proper pressure against the capstan, and the tape will slip. Every old deck that I've had has needed the pivot assembly to be cleaned and lubricated so that it will work properly.

As far as weak sound in one channel, dirty contacts and dirty controls are far more often the problem instead of failed components. Have you cleaned the controls and switches with something like Caig De-Oxit?

TWO PARTS UNITS??? Dude!!! You wouldn't by any chance have an extra black plastic piece that fits inside the opening around the pinch roller, would ya? That's the only thing I need to make mine complete. I just bought an NOS still in the original box dust cover to replaced my cracked one.

Keep us posted on how you're doing with getting yours up and running!

Clay

Charles
06-18-2005, 08:29 PM
Wordman,

You're right, gotta learn sometime. The amp in the A-4070 I have in my shop works great, it would be easy enough to swap them out. The problem lies with the reels slowing down. I was looking in the service manual, it said the reels were controlled my a couple of cap's. I would have thought that it was some kind of mechanical device, but I couldn't see anything.

So by God, I'll step up to the plate. Does anyone know it I'm correct in assuming that I need to replace a couple of cap's to get the reels turning with the correct tension on each other?

I must admit, there's eaiser things to learn on than a RtoR.

Please advise, Charles.

bOUddha
06-18-2005, 08:39 PM
Similar problem I had; reels began slowing shortly after play began. Turns out the brakes were misadjusted, or rather the spring tension on the braking arms was too high. :thmbsp:

wordman001
06-18-2005, 09:02 PM
Are they or is the capstan slowing and making them drag because the belt is slipping. Like I said, contact Dave , theteacman, I will send you his email. Get a belt set and a service manual, probably about $ 25 total. Change the belts and lube all the motors. I am not sure of the configuration on the 4070 but there are probably at least 6 points for oil on the three m otore, total.
The Capstan linkage needs to be lubed so it snaps up sharply when play is pushed, if not ti could be slipping.... there are several things you have to di , that are easy, before you know if you even have a problem- Joe

And of course any really technical question goes to Rolf, @ Vintage Tx. I'm only good for mechanical issues.... he's the electronics expert.

:banana: :banana: :banana: :banana: :banana: :banana: :banana: :banana: :banana: :banana: You Can Do It !

wordman001
06-18-2005, 09:06 PM
Dave , theteacman, theteacman@earthlink.net

Rolf, VintageTexas, rolf@txucom.net ( after July 1st. rolf@consolidated.net)

wordman001
06-18-2005, 09:28 PM
Charles: Try here for the 7010 head stack, be very specific about what you are looking for, thry probably will have it, they do notn seem to be too bad on prices, I've used them several times- Joe

reelprosound@cablemt.net <reelprosound@cablemt.net>

:thmbsp:

Charles
06-19-2005, 04:39 PM
I appreciate the help. Will try belts & lube, although I don't think that's the problem.

WWW.Records,

I live in California, Mo., app. 20 miles from Jefferson City. A ways from Joplin.

Fisherdude,

As a matter of fact, I do have the part you want. Donate 5 or 10 bucks to AK & furnish me with an address, will get it in the mail.

Fisherdude
06-19-2005, 09:31 PM
Fisherdude,

As a matter of fact, I do have the part you want. Donate 5 or 10 bucks to AK & furnish me with an address, will get it in the mail.


Done! You have a pm.

Thanks,
Clay