General:

Generously build tone pre amplifier issued in 1977 in the LRS series.

 

Front ^

 

 

Special futures:

Active tone control with extra functions.

 

User Manual:

Click here to download the owners manual of the 5F70 in PDF format

 

Schematic:

Click here to download the schematic diagram of the 5F70 in PDF format

 

 

Modifications:

The tone-amplifier can be updated by checking pcb's and all capacitors on these pcb-boards.
Many capacitors may be out of specs.
Check if the DML units are the new units we provide on this website.
If you have a multi voltage unit, set it to 240 Volt AC if you reside in Europe.
If you have a 120 V version in a 240 V region, its easy to replace the mains transformer, use a torodial model.

Old DML units that need to be replaced for these fine new DML-02's ^

The famous new DML-02: these 'Ultimate Quality DMLs' are only available here on this website.
Order here to update your amplifier.

 

New parts inside ^.

240 V transformer installed ^

Cover replaced ^ The pilot lamp can be replaced by a LED
and connected to one of the two transformer coils of 20V with a diode and resistor.

 

 

Sound:

Exceptional, unprecedented and powerfull sound, one of the best tone amplifiers ever made.

I drive my updated 5M20 and my 5C50 with the 5F70 and that works fine.