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Reel to Reel Tape Machines / Re: More Revox mods

« on: March 25, 2016, 11:48:56 AM »

Revox B77 Reproduce Amplifier PCB, modification from 3 3/4 - 7 1/2ips NAB to 7 1/2 - 15ips IEC (original values in brackets):

R1, R27: 56k (220k)
R9, R30: 2k7 (3k9)
R17, R43: 3k9 (4k7)
R22, R42: 470k (330k)

Hello,

First of all hello to everyone and thank you for all the valuable info on this forum, this is my first post here !! wohoo

I Successfully converted one of my b77 NS-NAB to HS-IEC, motor, tension board resistors, electronics.

I followed the diagrams from the B77 manual for HS IEC to do the conversion.
This is one of the first links that comes up when searching for B77 conversion to HS, so for a long time i wanted to ask this question:
Why did you put here R22, R42: 470k (330k) ? the original value for NS is 330k, but the HS repro board has 680k as a value in the manual, not 470k.

Thank you,

Best regards.