new boards for Revox B77 and PR99

Audio recording 2020. 11. 15. 12:27

I made new PCB for reproduce amplifier and recording amplifier .

 

Since these two boards are critical in sound quality.

 

Both PCBs can be mounted in followings

 

B77 and PR 99 15 ips , 7 1/2 ips high speed 2 track NAB

B77 and PR 99 15 ips , 7 1/2 ips high speed 2 track CCIR

 

B77 and PR 99 7 1/2 ips , 3 3/4 Standard speed 2 track NAB

 

B77 7 1/2 ips, 3 3/4 Standard speed 4 track NAB

 

 

Gold plated Epoxy glass PCB.

 

1 % error metal film resistors ( 1/4 w)

 

Wima film capacitors , silver mica capacitors ( 22 pF)

 

Panasonic Organic Polymer capacitors ( instead of electrolytic capacipors if possible )

 

Nichicon Muse top of audio grade electrolytic capacitors

 

Copal gold plated trimmer

 

matched pair metal can transistors ( Hfe selected by hands )