Revox B77 Reproduce amplifier

rory957

New Member
Oct 22, 2017
3
0
0
Croatia, VelikaGorica
Hi,
I need help.
I have Revox B77 2 track. I bought reproduce amplifier card 1.177.250-13 to recap it and then replace old in my RTR. Inside is card 1.177.250-12 and it is different. Does somebody know which is difference between them and are they interchangeble.
 

Scar972

Well-Known Member
Sep 1, 2017
43
4
115
Fort Worth, TX
The 1.177.250-13 is IEC equalization, card 1.177.250-12 is the more common NAB equalization. Yes you can plug either card into your machine, this is the only way I know of to change playback equalization for model B77 and PR99. I have a few spare reproduce cards.
 

rory957

New Member
Oct 22, 2017
3
0
0
Croatia, VelikaGorica
Thanks for help.
I have another question . During playback from tape in record mode or playback mode there are some low frequency noises on right channel. These is reason why I'll wish to try to swap reproduce card. Do you have any experience with this?
 

Scar972

Well-Known Member
Sep 1, 2017
43
4
115
Fort Worth, TX
Are the noises present through the head phone jack?
There are so many causes for noise, make sure tape heads and guides are clean, make sure all PCB cards are seated tightly in its slot.
Anthony
 

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