Revox 36 series ELECTRONIC Control Systems, power supply & Audio upgrade overhaul kit


$600.00 AUD

ELECTRONIC Capacitor, Trimmer & Rectifier Upgrade Kit for Revox 36 series tape recorder.

Models G36  F36  E36  D36  C36  B36  A36

A Nagravox 36 series kit will enable you to overhaul and service the electronic component aspects of your 36 series tape recorder. The kit contains everything you will likely need to  replace and upgrade those components that due to age have likely deteriorated. Motor capacitors, suppression capacitors, suppression diodes, old unstable selenium rectifiers (HT and LT), preset trimmers, all electrolytic capacitors and other bits and pieces.

This kit contains:

  • replacement capacitors for the 3 large triple can (3 capacitors within 1 can) power supply electrolytics. 2 x HT and 1 x LT. Newly manufactured to fit as a perfect replacement.

  • replacements for all other electrolytic capacitors.

  • replacement of suppressor capacitors and diodes

  • replacements for all motor capacitors including 2 in 1 type

  • full set of 3 modern silicon bridge rectifiers

  • piggy back PCB for 3 bridge rectifiers with appropriate dropper resistors complete with terminals and mounting pack. 

  • now also with special modification components to ensure better impedance matching with solid state amplifiers. (not supplied for A-C36 as there is no line out).

Triple Can Motor Capacitors =3.  suppression caps = 5  Other capacitors = 8.   Si diodes & rectifiers = 3.    Resistors & trimmers = 12.  Full mounting kit incl PCB + misc connection wire

TOTAL ITEMS: 84   (The total number varies depending on model 36 series - shown is for G36).

In house we MAKE the large triple can HT and LT capacitors ourselves using low leakage  conservatively rated capacitance and working voltage electrolytic capacitors sourced from reliable OEM's.  HT are rated 450 VDC and LT 63VDC. We also increase the capacitance slightly to provide improved power supply smoothing. (why - because its a prudent practice and will improve ripple, hum and noise). These capacitors fit directly in place exactly like the originals and the cases are fully insulated (the common -ve rail point is linked to the 4 mounting tabs)

  • The audio signal path capacitors are specially selected low noise, low leakage / high stability types and fit in easily on the point to point wiring terminal board.

  • A specially designed piggy back printed circuit board is provided with new silicon bridge rectifiers for the 3 power supplies. These replace the very suspect selenium rectifiers which should be replaced due to old age . CAUTION  fumes given off by old selenium rectifiers when they go faulty are very toxic.  The PCB mounts neatly simply drilling  3 x 3mm holes in the chassis. See the before and after pics below.

  • As silicon rectifiers are more efficient than the old selenium type, a higher rectified output voltage results.  This requires dropper resistors to limit working voltage back to normal values.  These resistors have been carefully calculated, selected AND tested (mounted in situ on the PCB with the rectifiers) to reduce voltages to normal working levels.

  • we supply  and  recommend  all suppression components are changed - single capacitors and rectifiers on switching assembly. These are often the cause of smoking and arced contacts.

  • ALL our motor capacitors are specially made for Revox and Studer tape recorders to our design specifications.

  • Is your machine 60hz?  Some later G36's were specifically made for the N American market with special 60 hz motors and have different motor capacitors - select 60hz OEM. Other machines were converted 50hz machines using modified capacitors  or if you have a 50hz machine and want to convert it to 60hz - select 50hz operating at 60hz    One is not better than the other and the factory supplied both.  The easiest way to determine this is to look at your reel motors.  They have the hz stamped in black ink on the rotating rotors.   All 60 hz operating machines whether converted 50hz or 60hz MUST have a capstan shaft that is 3.0mm diameter. (50 hz is 3.6mm). Check!  If you need to convert your shaft - we can help - contact us.
  • a very comprehensive service and repair manual (we call them service sheets) are included as a separate request and download. These have many detailed pictures ,diagrams and "how to do tips".

  • you are not alone! If you run into problems or have a query we provide free email support and help guide you through any issues. Skype and Facetime support also provided.  I am committed to help you restore and get your machine working like it should.

Full instructions for each functional update section are included with pictures before and after detailing  which components go where and a host of useful tips, checks and basic calibration. Note that for some models, notably A-C36 (mono self contained tape recorders no line out), the original rectifiers are separately mounted in different locations. Our PCB combines these onto 1 board which can be mounted in a convenient location with some wires having to be extended (there is plenty of room available). In these cases extension wire and systolex included.

Different models take some different components and most importantly different motor capacitors.  PLEASE CHECK and add a message to your order.  Open up your machine and see what capacitors are fitted or what capacitors are specified in the printing on the motors. There were many variations and the only definitive way is for YOU to check. Below is a guide only!

  • B36, A36 - capstan have  4.5 uf reel motors capacitors and  2uf capstan capacitor.  50hz

  • F36, E36, D36, C36, capstan have  3uf reel motors capacitors and  2uf capstan capacitor.  50hz

  • G36 Mk1 or Mk2 or early Mk3 50hz have  3uf reel motors capacitors and  2uf capstan capacitor  

  • G36 Mk1 or Mk2 or C-F36 that are 50hz operating at  60 hz have 2.5uf reel motors capacitors and  1.5uf capstan capacitor.  

  • G36 Mk3 50hz  have 3.5uf reel motors capacitors & 2+0.5uf capstan capacitor. 

  • G36 Mk3 OEM 60hz have  3.5uf reel motors capacitors & 2 + 0.5uf capstan capacitor

  • Later G36 Mk3 4/8 pole 50 hz have  3.5uf reel motors capacitors and  2uf capstan capacitor

  • G36 Mk3 60hz Specially for USA market. Nameplate says 117V 60hz. These have 3.5uf reel motors capacitors & 2+0.5uf capstan capacitor.

  • 6/12 pole motors are high speed for 50 hz have 3.5uf reel motors capacitors & 2+0.5uf capstan capacitor. 

  • HS motors or conversions use the similar capacitors as above.

When you order its always a good idea to send me a note of your serial number, the hz stamped on your reel motors, the diameter of your capstan shaft, the poles stamped on the capstan motor and whether you are operating 50 or 60hz or converting to a different hz.


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