Guys, is there a ReVox B760 tuner expert in the room? Mine is suffering from advanced Amnesia, it just evaporates station memory. When not used for months, after power on, I can program some stations which it will keep for few days. After that they are gone, and cannot be re-programmed at that time. Putting it away for some months, it seems to recover and allows to be programmed. For a day or what..
Familiar with this, please let me know (guess I need some new memory board/chip of some kind..) Voltages are OK, I remember I measured.
The sticky (yes, that awful paint) bastard is of no use right now..
Leonard
Familiar with this, please let me know (guess I need some new memory board/chip of some kind..) Voltages are OK, I remember I measured.
The sticky (yes, that awful paint) bastard is of no use right now..
Leonard
Your memory batteries seem to be empty. There are three AA size batteries in the compartment found under the opening lid on front panel.
Herr Studer, leider ist die Sache nicht so einfach..
Unfortunately things are not THAT simple.. i.e. that is not the problem.
Thanks Leonard
Unfortunately things are not THAT simple.. i.e. that is not the problem.
Thanks Leonard
If your tuner can memorize stations for at least some period of time, it means that voltage and register shifters on the station memory module 1.166.370 are OK, but the memory chips, namely IC01, IC05 and IC08, are failing and have become volatile.
Revox used Fairchild CMOS RAM chips that held 16 4 bit data words. If the chips are bad you may have a problem obtaining replacement. They are obsolete and I haven't seen them listed in a parts catalog in years.
Revox B760
Hello Leonard,
New on this forum I want to greet all the members first.
Leonard I would like to ask you if you have found the memory failure of your Revox B760?
thanks in advance.
Best regards.
Hello Leonard,
New on this forum I want to greet all the members first.
Leonard I would like to ask you if you have found the memory failure of your Revox B760?
thanks in advance.
Best regards.
on page 4-34 of the Fairchild semiconductor 1975 there is an equivalent of Revox's 4725 memories, the 74S189, and I was wondering if anyone had tried to replace those memories because I have the same problem.
you can find the 74S189 on page 4-277 of the Fairchild 1978 TTL data book.
I saw on eBay: 74LS189 Integrated Circuit TTL - MAKE: Fairchild Semiconductor | eBay
what do you think?
you can find the 74S189 on page 4-277 of the Fairchild 1978 TTL data book.
I saw on eBay: 74LS189 Integrated Circuit TTL - MAKE: Fairchild Semiconductor | eBay
what do you think?
NO DISPLAY REVOX B760
I own a REVOX B760 tuner and after ten years I put it into operation. I found that the frequency display does not work, only that of the memory. I have checked the fuses of the lower part and it is OK. What else to check?
I have the repair manual.
THANKS
I own a REVOX B760 tuner and after ten years I put it into operation. I found that the frequency display does not work, only that of the memory. I have checked the fuses of the lower part and it is OK. What else to check?
I have the repair manual.
THANKS
I have a Revox B77, B750, B760 and B790. Unfortunately it is all 40+ years old and you may find that you have a box of obsolete parts and can't find replacements. Many of the parts in old Revox equipment are not obtainable except as old parts. Even 20 years ago you could obtain parts, but now they are from old units being parted out.
I had this problem, I crossed the integrated circuits 5 and 2, 8 and 5 (4725) of the memory card (O card) to find which one was faulty, there was one out of order which I bought on ebay, since storage memory is working.
If you have a power supply board with new capacitors this revox B760 with a yagi antenna works very well !
REVOX B760
Thanks for the update on Revox B760. It's a bit difficult to solve my problem.
Do you have a suggestion for a reliable repairman or company?
Thanks for the update on Revox B760. It's a bit difficult to solve my problem.
Do you have a suggestion for a reliable repairman or company?
Dear Démétrios,
Unfortunately, I cannot indicate a repairer, you live in Greece and I in France ...
but if you have the B760 manual service I assure you it is not that hard to take the memory card apart and cross the 4725 ICs to find which one is faulty.
or maybe you could buy a used card on eBay, like this one:
Piece de Rechange Module Board Carte 1.166.370-12 Frequency memory unit REVOX b760 | eBay
at your disposal, best regards.
Unfortunately, I cannot indicate a repairer, you live in Greece and I in France ...
but if you have the B760 manual service I assure you it is not that hard to take the memory card apart and cross the 4725 ICs to find which one is faulty.
or maybe you could buy a used card on eBay, like this one:
Piece de Rechange Module Board Carte 1.166.370-12 Frequency memory unit REVOX b760 | eBay
at your disposal, best regards.
demetrios,
I'm not certain of how the situation is in Greece, but over here in Germany the Revox distributor's service department was very helpful for me to solve the issue that I had with my B791 TT, as described in another thread.
Best regards!
I'm not certain of how the situation is in Greece, but over here in Germany the Revox distributor's service department was very helpful for me to solve the issue that I had with my B791 TT, as described in another thread.
Best regards!
check out post #44 under
https://www.diyaudio.com/forums/sol...ble-electr-audio-magazines-5.html#post6747359
https://www.diyaudio.com/forums/sol...ble-electr-audio-magazines-5.html#post6747359